US20080147754A1 - Systems and methods for facilitating storage operations using network attached storage devices - Google Patents

Abstract

A system and method for communicating, browsing, verifying and routing data in storage operation systems using network attached storage devices is provided. In some embodiments, the system may include a management module and a media management component connected to the management server, which interoperate with network attached storage devices to provide the communicating, browsing, verifying and routing functions.

Description

RELATED APPLICATIONS
• This application is a continuation of U.S. patent application Ser. No. 11/640,730, filed Dec. 18, 2006, and is related to the following patents and pending applications, each of which is hereby incorporated herein by reference in its entirety:
• U.S. Pat. No. 6,418,478, titled PIPELINED HIGH SPEED DATA TRANSFER MECHANISM, issued Jul. 9, 2002, attorney docket number 4982/6;
• Application Ser. No. 09/610,738, titled MODULAR BACKUP AND RETRIEVAL SYSTEM USED IN CONJUNCTION WITH A STORAGE AREA NETWORK, filed Jul. 6, 2000, attorney docket number 4982/8;
• U.S. Pat. No. 6,542,972, titled Logical View and Access to Physical Storage in Modular Data and Storage Management System, issued Apr. 1, 2003, attorney docket number 4982/10;
• Application Ser. No. 10/658,095, titled DYNAMIC STORAGE DEVICE POOLING IN A COMPUTER SYSTEM, filed Sep. 9, 2003, attorney docket number 4982/18;
• Application Ser. No. 10/818,749, titled SYSTEM AND METHOD FOR PERFORMING STORAGE OPERATIONS IN A COMPUTER NETWORK, filed Apr. 3, 2004, attorney docket number 4982/35;
• Application titled SYSTEMS AND METHODS FOR GRANULAR RESOURCE MANAGEMENT IN A STORAGE NETWORK, filed Dec. 15, 2006 attorney docket number 25963/008.
BACKGROUND OF THE INVENTION
• The invention relates generally to performing storage operations on electronic data in a computer network, and more particularly, to facilitating storage operations including data stored on a network attached storage device.
• The storage of electronic data has evolved over time. During the early development of the computer, storage of electronic data was limited to individual computers. Electronic data was stored in Random Access Memory (RAM) or some other storage medium such as a magnetic tape or a hard drive that was a part of the computer itself.
• With the advent of network computing, the storage of electronic data gradually moved from the individual computer to dedicated storage devices accessible via a network. Some of these network storage devices evolved over time into networked tape drives, optical libraries, Redundant Arrays of Inexpensive Disks (RAID), CD-ROM jukeboxes, and other devices. Common architectures also include network attached storage devices (NAS devices) that are coupled to a particular network (or networks) and are used to provide storage capability for various storage operations that may be required by a particular network (e.g., backup operations, archiving, and other storage operations including the management and retrieval of such information).
• A NAS device typically utilizes a specialized file server or network attached storage system that connects to the network. A NAS device often contains a reduced capacity or minimized operating and file management system (e.g., a microkernel) and normally processes input/output (I/O) requests by supporting common file sharing protocols such as the Unix network file system (NFS), DOS/Windows, and server message block/common Internet file system (SMB/CIFS). Using traditional local area network protocols such as Ethernet and transmission control protocol/internet protocol (TCP/IP), a NAS device typically enables additional storage to be quickly added by connecting to a network hub or switch.
• Certain storage management procedures, such as hierarchical storage management (HSM) procedures provides for movement of files from hard disk to slower, less-expensive storage media, or secondary storage over time. As shown inFIG. 1, one migration scheme may include data transfer from amagnetic disk10 on a computing device to anoptical disk20 and later to atape30. Conventional data management software usually monitors hard disk capacity and moves data from one storage level to the next (e.g., from production level to primary storage and/or from primary storage to secondary storage, etc.) based on storage criteria associated with that data such as a storage policy, age, category or other criteria as specified by the network or system administrator. For example, an email system such as MICROSOFT OUTLOOK™ may have attachments “aged off” (i.e., migrated when age requirement is met) from production level storage to a network attached storage device.
• Referring toFIG. 2, there is shown a network architecture of asystem200 for performing storage operations on electronic data in a computer network in accordance with the prior art. As shown,system200 includes astorage manager201 and one or more of the following: adata store computer285, adata store290, adata agent295, ajobs agent240, a plurality ofmedia management components205, which may be referred to as media agents, a plurality ofstorage devices215, a plurality of media managementcomponent index caches210 and a storagemanager index cache230.
• Data agent295 is generally a software module that may be responsible for archiving, migrating, and recovering data ofdata store computer285 stored in adata store290 or other memory location. Eachdata store computer285 may have adata agent295 andsystem200 can support manydata store computers285.
• Eachmedia management component205 may maintain anindex cache210 which stores index data thatsystem200 generates during storage operations. The system may maintain two copies of the index data regarding particular stored data. A first copy may be stored with the data copied to astorage device215. Thus, a tape may contain the stored data as well as index information related to the stored data. In the event of a system restore, the index data stored with the stored data can be used to rebuild a mediamanagement component index205 or other index useful in performing storage operations.
• In addition, themedia management component205 that controls the storage operation also may write an additional copy of the index data to itsindex cache210. The data in the media managementcomponent index cache210 may be stored on faster media, such as magnetic media, and is thus readily available to the system for use in connection with storage operations and other activities without having to be first retrieved from aslower storage device215.
• Storage manager201 may also maintain anindex cache230. Storagemanager index cache230 may used to indicate, track, and associate logical relationships and associations between components ofsystem200, user preferences, management tasks, and other useful data. For example,storage manager201 may use itsindex cache230 to track logical associations betweenmedia management components205 andstorage devices215.Index caches230 and210 may reside on their corresponding storage component's hard disk or other fixed storage device. For example, themedia management component205 may retrieve data from storagemanager index cache230 regarding a storage policy and storage operation to be performed or scheduled for aparticular client285. Themedia management component205, either directly or via an interface module, may communicate with thedata agent295 atdata store computer285 regarding the details of an upcoming storage operation.
• Jobs agent240 may also retrieve fromindex cache230 information relating to astorage policy260 associated withdata store computer285. This information may be used in coordinating or establishing actions performed by one ormore data agents295 and one or moremedia management components205 associated with performing storage operations for that particulardata store computer285. Such information may also include other information regarding the storage operation to be performed such as retention criteria, encryption criteria, streaming criteria, path information, etc.
• Data agent295 may package or otherwise manipulate client data stored inclient data store290 in accordance withstorage policy260 and/or according to a user preference, and communicate client data to the appropriate media management component(s)205 for processing. The media management component(s)205 may store the data according to storage preferences associated withstorage policy260 including storing the generated index data with the stored data, as well
• as storing a copy of the generated index data in the media managementcomponent index cache210.
• As shown inFIG. 2, a network attachedstorage device250 andcorresponding file server254 are also connected tostorage manager201. NAS250 andfile server254 are dedicated applications without a general purpose operating system and generally do not by themselves support software applications, such as a back-up.
• NAS devices typically interface with other components, such as those ofstorage management system200, or a relatively limited basis. One reason for this is because NAS devices tend to be proprietary. Accordingly, other storage system designers have a limited knowledge of implementation particulars needed to design fully compatible and integrated interfaces for their products.
• Moreover, there are many different types of NAS devices, such as WAFL by NETWORK APPLIANCE of Sunnyvale, Calif., the EMC CELERA file system by the EMC Corporation of Hopkinton, Mass., the NETWARE file system by NOVELL of Provo, Utah, and other vendors. Most of these systems export their file systems to host computers such as the common Internet file system (CIFS) or the network file system (NFS), but provide no mechanism to run software on their operating systems or reside on the file system stack to intercept read/write or other data requests.
• One solution to this problem is through the use of a proxymedia management component252 connected tofile server254.Proxy media agent252 runs the applicable software used to move data to NAS250. Proxymedia management component252 may, for example, issue commands using the Network Data Management Protocol (“NDMP”).
• Referring now toFIG. 3, a representation of adata structure310 is shown that may be used bysystem200 in moving data to NAS250. As shown,data structure310 includes the actual data being moved in apayload314 as well as aNDMP header312 precedingpayload314 andNDMP trailer316 following the payload.
• As discussed above,index cache230 instorage manager200 may keep track of certain information including the status of storage operations. If a storage operation copying data fromdata store290 toNAS250 is interrupted, for example,index cache230 may be used to restart the operation and may keep track of the data path, data transferred, data remaining, etc. If data fromNAS250 needs to be restored, data inindex cache230 may also be used to facilitate such a restore operation.
• One shortcoming of the NAS architecture described above is the vulnerability associated with the dedicated data transfer path which includesproxy252. For example, if proxymedia management component252 becomes inoperative or otherwise unavailable, there is generally no way to send data toNAS250. Similarly, if other media management components in the system are handling less of a load than proxymedia management component252, they are unable to assistmedia management component252 as it is the sole media management component designated forNAS250.
• Moreover, shouldstorage manager201 become inoperative or otherwise unavailable, or its data or associated indexes be corrupted, incomplete, or otherwise unavailable, there is generally no way to rebuildindex230 to with data fromNAS250.
• Furthermore, with conventional systems, it is difficult to verify the contents ofNAS250 after data is stored thereon. As discussed above, in general, NAS systems are proprietary and a simple request to verify the data stored on a NAS cannot be performed nor can information regarding the data, such as helpful metadata, be made available.
• Therefore, it would be desirable to provide a more robust storage operation system that can more effectively interoperate with NAS devices.
SUMMARY OF THE INVENTION
• A system and method for communicating, browsing, verifying and routing data in storage operation systems using network attached storage devices is provided. In some embodiments, the system may include a management module and a media management component connected to the management server, which interoperate with network attached storage devices to provide the communicating, browsing, verifying and routing functions.
BRIEF DESCRIPTION OF THE DRAWINGS
• The invention is illustrated in the figures of the accompanying drawings which are meant to be exemplary and not limiting, in which like references are intended to refer to like or corresponding parts throughout, and in which:
• FIG. 1 illustrates a storage operation in accordance with the prior art;
• FIG. 2 is a system diagram illustrating a prior art storage system;
• FIG. 3 is a prior art data arrangement;
• FIG. 4 is a system diagram illustrating a storage operation system constructed in accordance with an embodiment of the invention;
• FIG. 5 is a flow chart illustrating some of the steps associated with a method in accordance with an embodiment of the present invention;
• FIG. 6 is a representation of a data structure constructed in accordance with an embodiment of the present invention;
• FIG. 7 is a flow chart illustrating some of the steps associated with a method in accordance with an embodiment of the present invention;
• FIG. 8 is a flow chart illustrating some of the steps associated with a method in accordance with an embodiment of the present invention;
• FIG. 9 is a representation of a data structure constructed in accordance with an embodiment of the present invention;
• FIG. 10 is a flow chart illustrating some of the steps associated with a method in accordance with an embodiment of the present invention;
• FIG. 11 is an illustration of a graphical user interface constructed in accordance with an embodiment of the present invention;
• FIG. 12 is a flow chart illustrating some of the steps associated with a method in accordance with an embodiment of the present invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
• Referring toFIG. 4, asystem400 in accordance with one embodiment of the present invention is shown.System400 is similar in certain respects to the system described inFIG. 2, and generally includes components and functional blocks which have been numbered similarly to denote some similar functionality and general correspondence. For example,system400 includes a storage manager401 (storage manager201 inFIG. 2), one or more computing devices485 (computer285 inFIG. 2, which include clients), data store(s)490 (data store(s)290 inFIG. 2),data agent495, (data agent(s)295 inFIG. 2) jobs agent(s)440 (jobs agent240 inFIG. 2) media management components405 (components205 inFIG. 2), storage device415 (storage devices215 inFIG. 2), media managementcomponent index caches410 and a storage manager index cache430 (caches210 and230, respectively inFIG. 2) The system and elements thereof are further described in application Ser. No. 09/610,738, now U.S. Pat. No. 7,035,880 which is incorporated by reference in its entirety.
• One way in whichsystem400 has been improved as compared to the systems shown inFIGS. 1-3, is by the addition ofNAS module406, which may includeverification component407,routing component408,browsing component409, andmetadata component411. In some embodiments,NAS module406 may be installed or distributed across some or allcomponents405 to facilitate data routing, data verification and browsing, and communication withNAS device450, among other things.
• Data agent495 is generally a software module that is responsible for archiving, migrating, and otherwise coordinating the transfer and recovery of data fromcomputer485 ordata store490 to another memory location such asstorage device415 orNAS device450. Eachcomputer485 may have one or more associated data agent(s)495 andsystem400 can supportmany computers485.System400 may provide a plurality ofdata agents495 each of which may backup, migrate, and recover data associated with a different application. For example, differentindividual data agents495 may be designed to handle MICROSOFT EXCHANGE data, LOTUS NOTES data, MICROSOFT WINDOWS file system data, MICROSOFT ACTIVE DIRECTORY OBJECTS data, and other types of data known in the art.
• In the case weredata store computer485 has two or more types of data, onedata agent495 may be used for each data type to archive, migrate, and restorecomputer485 data (however, in other embodiments, one data agent may handle multiple types of data). For example, to backup, migrate, and restore some or all of the data on a MICROSOFT EXCHANGE 2000 server,computer485 may use a MICROSOFT EXCHANGE 2000Mailbox data agent495 to backup the EXCHANGE 2000 mailboxes, a MICROSOFT EXCHANGE 2000Database data agent495 to backup the EXCHANGE 2000 databases, a MICROSOFT EXCHANGE 2000 PublicFolder data agent495 to backup the Exchange 2000 Public Folders, and a MICROSOFT WINDOWS FileSystem data agent495 to backup the file system. In some embodiments,data agents495 would may be treated as fourseparate data agents495 bysystem400 even though they may reside on the samedata store computer485.
• Eachmedia management component405 may maintain anindex cache410 which may storeindex data system400 generates during storage operations. This may include, for example, storage operations for MICROSOFT EXCHANGE that generate index data. Index data may include, for example, metadata or other information regarding the location of the stored data on a particular media, information regarding the content of the data stored such as file names, sizes, creation dates, formats, application types, and other file-related criteria, information regarding one or more clients associated with the data stored, information regarding one or more storage policies (discussed below), storage criteria, or storage preferences associated with the data stored, compression information, retention-related information, encryption-related information, stream-related information, and other types of information.
• Data inindex cache410 thus provides the system with an efficient mechanism for performing storage operations including information useful in locating files for recovery operations and for managing and tracking stored data. The system generally maintains two or more copies of the index data regarding particular stored data. A first copy may be stored with the data copied to astorage device415, the other in the index itself. Thus, a tape may contain the stored data as well as index information related to the stored data.
• In the event of a system restore or other data restore or refresh operation, the index data included with the stored data may located onstorage device415 and be used to rebuild a mediamanagement component index405 or other index useful in performing storage operations which may include repopulating itsindex cache410.
• Storage manager401 may maintain anindex cache430. Storagemanager index cache430 may used to indicate, track, and associate logical relationships and associations between components ofsystem400, user preferences, management tasks, and other useful data. For example,storage manager401 may use itsindex cache430 to track logical associations betweenmedia management components405 andstorage devices415.Storage manager401 may also use itsindex cache430 to track the status of storage operations to be performed, storage patterns associated with the system components such as media use, storage growth, network bandwidth, service level agreement (“SLA”) compliance levels, data protection levels, storage policy information, storage criteria associated with user preferences, retention criteria, storage operation preferences, and other storage-related information.
• Index caches may430 and410 may reside on their corresponding storage component's hard disk or other fixed or dynamic storage device or on other associated memory. For example,media management component405 may retrieve information from storagemanager index cache410 regarding a storage policy and storage operation to be performed or scheduled for aparticular computer485.Media management component405, either directly or via an interface module, may communicates with thedata agent295 at thedata store computer485 regarding the storage operation.
• Jobs agent440 may also retrieve from index cache430 astorage policy460 associated with thedata store computer485 and use information from one ormore storage policies460 to communicate todata agent495 one or moremedia management components405 associated with performing storage operations for that particulardata store computer485 as well as other information regarding the storage operation to be performed such as retention criteria, encryption criteria, streaming criteria, etc.
• A storage policy is generally a data structure or other information, which may includes a set of preferences and other storage criteria for performing storage operations. The preferences and storage criteria may include, but are not limited to: a storage location, relationships between system components, network pathway to utilize, retention policies, data characteristics, compression or encryption requirements, preferred system components to utilize in a storage operation, and other criteria relating to a storage operation. A storage policy may be stored to a storage manager index, to archive media as metadata for use in restore operations or other storage operations, or to other locations or components of the system.
• Data agent495 may package or otherwise manipulate client data stored indata store490 in accordance withstorage policy460 and/or according to a user preference, and may communicate this data to the appropriate media management component(s)405 for processing. Media management component(s)405 may store the data according to storage preferences associated with the storage policy including storing the generated index data with the stored data, as well as storing a copy of the generated index data in the media managementcomponent index cache410.
• Media management component405 may further includes aNAS module406 including ametadata component411.NAS module406 may me implemented as a software module that may be installed on one or moremedia management components405.NAS module406 may interoperate withcomponents405,data agents495, and/or storage manager(s)401 to coordinate and verify the transfer of data from computer(s)485 toNAS device450.
• As shown inFIG. 4,media management component405 may further include a NAS component235 associated withNAS module406.NAS modules406 may be associated or resident with eachcomponent405 or may be distributed acrossvarious component405 in system400 (e.g., everyother component405 may have aNAS module406, one in threecomponent405 may have aNAS module406, or any other desired distribution). Moreover, in some embodiments, one ormore components405 may share aNAS module406 which may be moved as necessary (e.g., float) to accommodate system storage operations. This providessystem400 with a robust set of routing options to reachNAS devices450 throughmultiple components405.
• In some embodiments, eachmedia management component405 is may be capable of handling storage operations to either astandard storage device415, or to work with afile server454 to handle copy operations with aNAS storage device450. NAS components435 may, for example, operate using the NDMP protocol. Resource allocation for moving data fromdata store490 toNAS450 may now be based on other relevant characteristics instead of being limited to a particular defined proxy media agent. For example, adata paths402 and404 from data fromdata store490 toNAS450 may be defined by properties ofNAS450—for example ifNAS450 includes only particular types of data such as EXCHANGE or OUTLOOK or ifNAS450 is further defined as being the OUTLOOK data for a particular individual—such characteristics may be taken into account when defining whichmedia management component405 to use forNAS device450.
• Data path402 and404 may also be based onstorage policy460 defined fordata store490. For example, astorage policy460 may be defined for each particular type of data or application—such as EXCHANGE or OUTLOOK. The storage policy could define, for example, where data is to be stored, the duration of the storage, and how many copies should be made. Each storage policy may define one or multiple data paths for moving data fromdata store490 toNAS450. Each data path may include a single media management component or multiple management components and a set ofstorage devices415 and/orNAS devices450.
• Storage policies460 may define apreferred data path402 and404 for handling data moving fromdata store490 toNAS450, or define a load balancing algorithm so that data paths may be utilized that have more availability than other data paths. The actual data path selected may, for example, be first based on the properties ofNAS device450, such as data types or application, and then chosen based onstorage policy460 for a preferred data path and/or load balancing. For example, additional NAS devices450 (not shown) may be operating a minimum capacity with others operating at a higher or near maximum capacity (also not shown). In this case, it may be desirable to distribute data load to underutilized resources. This may be done based on preferences in storage policy or certain load distribution algorithms the govern system operation. For example, in one embodiment, it may be desirable to distribute load acrossmultiple NAS modules406,NAS devices450 and associated transmission links such that a substantially even distribution is obtained. In other circumstances, for example, when acertain NAS module406 is unavailable, it may be desired to continue to send data to acertain NAS device450, using, however, adifferent NAS module406. This may be accomplished with embodiments of the present invention by routing data storage operations to adifferent NAS module406 which may communicate and supervise storage operations to theoriginal NAS device450, even though the nowunavailable module406 was previously handling such operations.
• In this way, if a certainmedia management component405 becomes inoperative,storage manager400 may select anothermedia management component405 in defining a data path toNAS450. Moreover,storage policy460 may be defined to perform load balancing. When load balancing is chosen, one option is forstorage manager400 to assign the least loaded media management component to handle a particular storage operation. For example, if a storage policy has three (3) data paths and ten (10) storage operations to perform, the ten jobs may be spread across available media management components. This may mean that multiple operations for asingle NAS450 may be balanced across multiplemedia management components405.File server454 may be used to keep track of applicable copy information so as to improve routing inter-connectivity.
• Storage manager401 may be also used to monitor the capacities of respectivemedia management components405 and dynamically alterdata path402 and404. In this way, a copy operation may begin using a first media management component and a first data path and then, because of, for example, a change in the load insystem400, a second data path including a different media management component may be selected to complete the copy operation. For example, if the first media management component that started the copy operation becomes overburdened or inoperative,storage manager400 may decide to move the copy operation to a different media management component. Moreover,storage manager401 may choose a data path so as to most efficiently utilize storage media. For example, if using a first data path may result in using a last portion of a first storage medium and a first portion of a second storage medium,storage manager401 may choose a different data path which results in only a single storage medium being used.
• Referring now toFIG. 5, some steps associated with a method for facilitating storage operations in accordance with an embodiment of the invention is shown. The method shown in the figure could operate using, for example,system400 shown inFIG. 4. As shown, atstep502, a request may be received to perform a storage operation including sending data to a network attached storage device. Atstep504, a data path may be determined for the source data to the network attached storage device. This may include a determination based on a storage policy or other routing preference. It may also further involve an analysis of the network operating conditions including network congestion of utilization rate of the resources defined in the transmission path, and certain specified load balancing requirements or preferences.
• If one or more resources as initially specified are beyond a threshold, the path and/or the destination NAS device may be altered to ensure certain system management operating conditions are achieved/maintained. For example, if a certain media management component, transmission path or destination device is operating beyond a specified level, some or all of those resources may be altered, such that other resources are used instead to meet or maintain system operating specifications. This may include specifying another media management component to handle storage operations to a NAS device that was previously associated with another different media management component. Moreover, it will be understood that such resource reallocation may occur dynamically (e.g., upon consideration of network operating conditions), or as specified by a user, or in recognition of a system change, such as removal of certain hardware such as a NAS device, or computing devices, etc. This may be accomplished by a storage manager or other system management module.
• Atstep506, once the route and destination resource has been established, the storage operation is performed. This may involve moving one or more chunks of data associated with an archive file, etc. This may also involve confirming that the data has successfully been stored, and writing file location, size, and other index information to indexes in media management components or storage managers.
• Moreover, in some embodiments, the system may perform additional monitoring of the resources operation while performing the storage operation to determine the effect of the operation on system resources (step508). Such load measurement may determine, for example, whether particular devices in the system are more loaded with data than other devices and also determines whether particular devices have no load—such as, for example, if such devices have become inoperative. This additional information may be used atstep510, where the system may determine if there is a load imbalance or whether that a device on the chosen data path is no longer operative. This may be confirmed by performing certain tests on the data path to determine, if, it is in fact inoperative. In some embodiments, such further monitoring may be performed atstep504. Moreover, based on this information, the system may further redefine or reallocate system resources to distribute data load substantially evenly across network resources, or conserve media usage, or promote other load balancing goals (e.g., distribute data operations across network resources in view of a the need to remain within a copy or backup window, or other operating condition such as a data path preference etc.). Moreover, it will be understood that system monitoring and analysis with respect to load balancing may be performed iteratively atsteps504 and510 with resource reallocation occurring on a continuous basis based on the results of the monitoring and analysis.
• Referring back now toFIG. 4,media management component405 may further include ametadata component411. As data is copied fromdata store490 is toNAS450, the path may includemedia management component405 andmetadata component411.Metadata component411 may generate certain storage metadata, which may include, for example a storage header and trailer, including management information associated withsystem400, which may be appended to any data copied (such as a data “chunk”). This metadata may include the size of the data, path information, offsets, client ID information, information relating to the source data such as, which archive file a chunk may be associated with, what files are in the chunk, chunk number, and any other data useful for data management, etc. This metadata may be separated into a header and trailer and appended to the data as described below.
• For example, inFIG. 6,data chunk690 andmetadata header678 andmetadata trailer682 may be combined to produce the data structure shown. Metadata may be separated betweenheader678 andtrailer682 as desired for system management purposes. For example,header678 may include the size of the data, and offsets, whiletrailer682 may include path information, client ID information, job ID, information relating to the source data such as, which archive file a chunk may be associated with, what files are in the chunk, chunk number, etc. However, any useful arrangement may be used, if desired.
• In operation,media management component405 andmetadata component411 may generate the data arrangement shown inFIG. 6 and using write commands, for example, the NDMP protocol, may send data along with metadata as shown inFIG. 6 tofile server454 for subsequent storage inNAS450. In some embodiments,file server454 may remove any NDMP header or trailer, and add metadata created bycomponent411 and store the combination onNAS450. Data may be retrieved by a media management component when acomputing device485 orstorage manager401 issues a data or system restore request. In this case, the media management component may queryfile server454 on behalf of the requesting device for the requested information (which may be retrieved viapaths413 and414 and subsequently routed to the appropriate destination).
• Referring toFIG. 7, there is shown a method for facilitating storage operations including NAS in accordance with an embodiment of the invention. The process could be used with, for example,system400 shown inFIG. 4. Asstep702, a request is received by a storage manager or media management component to move data to a network attached storage device. Atstep704, a routine, which may be recursive, is initiated for each group of data, such as a chuck, to be moved. This may involve evaluating path and destination information or preferences, and obtaining metadata relating to the information as further described herein.
• Atstep706, a chunk of data from the data source is moved or copied to or processed by an applicable media management component. This may involve processing on a source computing device prior to movement a NAS device. Atstep708, the media management component may issues an applicable write command and generates metadata for the received data (in some embodiments, a data structure including data and metadata, is created). Atstep710, a file server receives the write command, the data and the metadata. Atstep712, the file server combines the data and metadata, writes the resulting data structure to the NAS.
• Referring toFIG. 8 there is shown a process for retrieving data from a NAS in accordance with an embodiment of the invention. The process may be used with, for example,system400 shown inFIG. 4. Atstep820, a request is received to restore data stored on a NAS. Atstep822, a routine, which may be recursive, is initiated for each set or chunk of data which may request a specific chunk, monitor data received and response to the request, and terminate the retrieval operation once the desired data is retrieved.
• Atstep824, a file server retrieves data and associated metadata from a NAS in response to the request. In some embodiments, the file server may separate, chunk data and metadata and provide each to the media management device. Atstep826, the data and metadata may be forwarded to a media management component or a computing device. Atstep828, the media management component may use the data and metadata to identify and route the requested information to the source requesting such information and “unpack” or otherwise obtain the data (e.g., a computing device requesting a data restore operation). In certain circumstances, the metadata associated with the stored data may be desired, for example, in the event of a system restore, to reconstruct one or more media management or storage manager indexes.
• Referring again back toFIG. 4,NAS module406 may further include aNAS verification component407 for verifying that the information requested information is properly stored (or retrieved) fromNAS device450. For example, in operation,NAS verification module411 may issue a request tofile server454 to restore certain data stored inNAS device450 to adata destination412. The request may include, for example, the path stored onNAS device450, whether backup information stored onNAS450 was a full or incremental backup, a list of the paths to restore, a destination path, an option not to write the data stored inNAS450, etc. This request may be issued in order to obtain metadata associated with stored data which may be compared with certain index information to confirm the requested data is available, was properly stored and may be retrieved.
• File server454 may send a retrieve request toNAS450, that reads data stored onNAS450, and forwards the responsive data tomedia management component405.NAS verification module407 may read the metadata associated with the retrieved data and forward the data todestination412. In some embodiments,data destination412 may be a null or other empty port such as air and does not include a storage medium. This may be performed in cases where only metadata is desired for verification purposes.
• Referring toFIG. 9, adata structure906 constructed in accordance with the principles of the present invention is shown. As shown,data structure906 may include adump header920, adata payload922 and atrailer922.Dump header920 may include, for example, a description and size ofdata payload922, and a list of the files inpayload922.File server454 may further modifydata structure906 and add alabel field926, afile marker field928, achunk header930, afile marker932, afile marker936, achunk trailer938, afile marker940, and atrailer942 to producedata structure908.Label926 may labeldata structure908.File markers928,932,936 and940 may separate different portions ofdata structure908.Chunk header930 may include header information for each chunk ofdata922. Similarly, chunk trailer includes trailer information for each chunk ofdata922.
• NAS verification component407 receives data fromNAS450 in response to a request and may compare certain information indata structure908 with information from an index inmedia management component405 orstorage manager401. For example,verification component407 may compare information indump header920 to a corresponding entry stored inindex cache430 or inindex cache410. Such information was initially generated whendata906 was first stored onNAS450. Further, whenNAS verification module407 restoresdata908, the restoration process itself generates metadata which may also be compared with meta data stored inindex cache430 or index cache410 (e.g., unique or somewhat unique rebuild information, etc.).
• The results of such comparisons may be used to verify the contents ofpayload922 and may be performed using techniques known in the art—such as checksums, hashing, etc. if the comparisons are favorable,media management component405 then forwardsdata908 todata destination412. In some embodiments,data destination412 may be a “dummy” device, air or other null port and excludes a storage medium, if the metadata is desired. This increases the speed of the process because less time is uses as compared tomedia management component405 actually writingdata structure408 to a storage medium. Further, no extra storage space needs to be utilized.
• Referring toFIG. 10, a flow chart illustrating some of the steps involved in a method for validating data stored on a network attached storage device in accordance with an embodiment of the invention is shown. The method inFIG. 10 may be implemented using, for example,system400 discussed above. Atstep1002, a request is made to restore data stored on a NAS. This may involve a computing device or storage manager contacting a media management component with such as request. Next, atstep1004, a media management component may communicate with a NAS device through a file server and locate the data requested. After the requested data has been located, data from the NAS may be retrieved and sent from the file server and restored. Atstep1006, certain metadata such as a dump header or other portions from the data stored in the NAS may be extracted and compared with metadata stored in an index cache. If the comparison is favorable, the metadata or other data may be used for system restore or management purposes. For example, this information may be used to verify that the requested information is stored on the NAS device and may be retrieved, if necessary (e.g., for repopulating a computing device with application data or repopulating a management database with system management information, etc.).
• If the comparison is unfavorable, the query may be processed several times, until a favorable result is obtained, or until a certain number of unfavorable results are obtained, in which the query may terminate as a time out, and system indexes or processes updated to reflect the requested information could not be found, and therefore not retrieved. Assuming that a favorable result is obtained, the metadata may be retrieved and the data from the NAS is sent to a null port which does not include a storage medium (step1008). Moreover, data that has been obtained may be merged into any existing media management or storage manager database to repopulate an index or other databases in the event a restore is desired.
• Thus, by requesting to restore data from a NAS and reading header and/or other metadata from the NAS data, a system and method for verifying data stored on a NAS is realized.
• As shown inFIG. 4,NAS module406 may further include aNAS browsing component409 for allowing a user to browse information or data stored onNAS device450. For example, in operation,NAS browsing component409 may be invoked, for example, on acomputing device485 and issue a request tomedia management component405 for information regarding certain data stored inNAS device450. The request may include, for example, a request for a file system overview of the files stored onNAS device450, including certain information or properties about those files.
• Once the information is obtained, a graphical user interface on a computing device may display the information in a familiar graphical file format with an icon representing each file. This is generally shown inFIG. 11. As shown,screen1101 may be similar to a WINDOWS file system display screen, which may includefile icons1102 representing NAS files under management. In operation, a user may select one oficons1102 and invoke a pulldown orother menu1103 which lists a set of options or operations that may be performed on the various files shown. For example, this may include a properties selection which may display various properties of the files under management including the size of the data, path information, offsets, client ID information, application information, date copied, storage policies associated with the data, information relating to the source data such as, which archive file a chunk may be associated with, what files are in the chunk, chunk number, and any other data useful for data management, etc.
• The user may obtain this information by choosing aparticular file1102 and selecting theproperties option1104 from pull downmenu1103. It will be understood each property may be presented in a layered or tiered format that additional details may be obtained by clicking or selecting a particular property and that other options may also be available(not shown).
• Referring toFIG. 12, a flow chart illustrating some of the steps involved in a method for browsing data stored on a network attached storage device in accordance with an embodiment of the invention is shown. The method inFIG. 12 may be implemented using, for example,system400 discussed above. Atstep1202, a request may be made to view files stored on one or more NAS devices. This may involve a user invoking a browser on a computing device. At this point the user may be prompted to select a certain network of interest. Once selected, the system may scan the selected network(s) for associated NAS devices. A list of available devices may be displayed, from which the user may choose one or more devices of interest. In some embodiments, a user may request a list of files or application programs, and the system may generate a list of available NAS devices that include the specified information.
• Once a user selects one or more NAS devices from the list, a query may sent to the system of those devices for a list of files under management. The system may obtain these lists, for example, from a system index or through direct queries to the NAS devices. Next, atstep1204, the user may select certain files to receive more information about them. This may involve the restoration process described above where files are restored to obtain metadata for browsing purposes (step1206).
• Next, atstep1208, the information may be displayed to the user for further inspection. At this point, the user may further direct operations with respect to the displayed files. For example, the user may direct a full or partial data restore from the NAS device and may direct certain clients be repopulated with the restored data. Similarly, the user may update or refresh certain system management components such as a storage manager database or index or media management component index to be updated. Other operations are also contemplated, such as directing the copying of data or management information to a disk, other portable media or to another network location.
• Systems and modules described herein may comprise software, firmware, hardware, or any combination(s) of software, firmware, or hardware suitable for the purposes described herein. Software and other modules may reside on servers, workstations, personal computers, computerized tablets, PDAs, and other devices suitable for the purposes described herein. Software and other modules may be accessible via local memory, via a network, via a browser or other application in an ASP context, or via other means suitable for the purposes described herein. Data structures described herein may comprise computer files, variables, programming arrays, programming structures, or any electronic information storage schemes or methods, or any combinations thereof, suitable for the purposes described herein. User interface elements described herein may comprise elements from graphical user interfaces, command line interfaces, and other interfaces suitable for the purposes described herein. Screenshots presented and described herein can be displayed differently as known in the art to input, access, change, manipulate, modify, alter, and work with information.
• Moreover, it will be appreciated that the systems and methods provided herein are intended to exemplary and not limiting and that additional elements or steps may be added or performed in different order, if desired.
• While the invention has been described and illustrated in connection with preferred embodiments, many variations and modifications as will be evident to those skilled in this art may be made without departing from the spirit and scope of the invention, and the invention is thus not to be limited to the precise details of methodology or construction set forth above as such variations and modification are intended to be included within the scope of the invention.

Claims (20)

1. A method for verifying data stored in a storage system, the storage system comprising a management server, a media management component connected to the management server, at least one network attached storage device connected to the media management component, and a data source connected to the management server, the method comprising:

sending a request to restore stored data, the stored data being stored on a network attached storage device and including first metadata;

receiving the stored data;

comparing the first metadata with second metadata stored in the storage system;

verifying the stored data based on the comparing; and writing the stored data to a data destination, the data destination excluding a first storage medium.

2. The method ofclaim 1, wherein the first metadata comprises a dump header.

3. The method ofclaim 2, wherein the dump header includes a list of files in the stored data.

4. The method ofclaim 1, wherein the second metadata is stored in an index cache.

5. The method ofclaim 1, wherein the second metadata is stored in the management server.

6. The method ofclaim 1, wherein the second metadata is stored in the media management component.

7. The method ofclaim 1, wherein the data destination is an empty port.

8. The method ofclaim 1, further comprising:

restoring the stored data; and

producing the second metadata based on the restoring.

9. The method ofclaim 1, wherein the second metadata is generated when the stored data is stored on the network attached storage device.

10. A system for verifying stored data, the system comprising:

a management server;

a media management component connected to the management server;

at least one network attached storage device connected to the media management component, the network attached storage device including stored data, the stored data including first metadata; and

a data source connected to the management server; wherein:

the media management component sends a request to restore the stored data, receive the stored data, and compare the first metadata with second metadata stored in the storage system, the media management component further being effective to verify the stored data based on the comparing and write the stored data to a data destination, the data destination excluding a first storage medium.

11. The system ofclaim 10, wherein the first metadata comprises a dump header.

12. The system ofclaim 12, wherein the dump header comprises a list of files in the stored data.

13. The system ofclaim 10, wherein the second metadata is stored in an index cache.

14. The system ofclaim 10, wherein the second metadata is stored in the management server.

15. The system ofclaim 10, wherein the second metadata is stored in the media management component.

16. The system ofclaim 10, wherein the data destination is an empty port.

17. The system ofclaim 10, wherein the media management component is configured to restore the stored data and produce the second metadata based on the restoration.

18. The system ofclaim 10, wherein the media management component is configured to generate the second metadata when the stored data is stored on the network attached storage device.

19. A computer readable storage medium including computer executable code effective to verify data stored in a storage system, the storage system comprising a management server, a media management component connected to the management server, at least one network attached storage device connected to the media management component, and a data source connected to the management server, the method comprising:

sending a request to restore stored data, the stored data being stored on a network attached storage device and including first meta data;

receiving the stored data;

comparing the first meta data with second meta data stored in the storage system;

verifying the stored data based on the comparing; and

writing the stored data to a data destination, the data destination excluding a first storage medium.

20. The computer-readable medium ofclaim 19 having further instructions stored thereon including sequences of instructions which, when executed by one or more processors cause an electronic device to restore the stored data; and

produce the second metadata based on the restoring.

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