barrier=1

This enables/disables barriers. barrier=0 disables it,barrier=1 enables it.

errors=remount-ro(*)

Remount the filesystem read-only on an error.

errors=panic

Panic and halt the machine if an error occurs.

intr (*)

Allow signals to interrupt cluster operations.

nointr

Do not allow signals to interrupt clusteroperations.

noatime

Do not update access time.

relatime(*)

Update atime if the previous atime is older thanmtime or ctime

strictatime

Always update atime, but the minimum update intervalis specified by atime_quantum.

atime_quantum=60(*)

OCFS2 will not update atime unless this numberof seconds has passed since the last update.Set to zero to always update atime. This option needwork with strictatime.

data=ordered (*)

All data are forced directly out to the main filesystem prior to its metadata being committed to thejournal.

data=writeback

Data ordering is not preserved, data may be writteninto the main file system after its metadata has beencommitted to the journal.

preferred_slot=0(*)

During mount, try to use this filesystem slot first. Ifit is in use by another node, the first empty one foundwill be chosen. Invalid values will be ignored.

commit=nrsec (*)

Ocfs2 can be told to sync all its data and metadataevery ‘nrsec’ seconds. The default value is 5 seconds.This means that if you lose your power, you will loseas much as the latest 5 seconds of work (yourfilesystem will not be damaged though, thanks to thejournaling). This default value (or any low value)will hurt performance, but it’s good for data-safety.Setting it to 0 will have the same effect as leavingit at the default (5 seconds).Setting it to very large values will improveperformance.

localalloc=8(*)

Allows custom localalloc size in MB. If the value is toolarge, the fs will silently revert it to the default.

localflocks

This disables cluster aware flock.

inode64

Indicates that Ocfs2 is allowed to create inodes atany location in the filesystem, including those whichwill result in inode numbers occupying more than 32bits of significance.

user_xattr (*)

Enables Extended User Attributes.

nouser_xattr

Disables Extended User Attributes.

acl

Enables POSIX Access Control Lists support.

noacl (*)

Disables POSIX Access Control Lists support.

resv_level=2 (*)

Set how aggressive allocation reservations will be.Valid values are between 0 (reservations off) to 8(maximum space for reservations).

dir_resv_level= (*)

By default, directory reservations will scale with filereservations - users should rarely need to change thisvalue. If allocation reservations are turned off, thisoption will have no effect.

coherency=full (*)

Disallow concurrent O_DIRECT writes, cluster inodelock will be taken to force other nodes drop cache,therefore full cluster coherency is guaranteed evenfor O_DIRECT writes.

coherency=buffered

Allow concurrent O_DIRECT writes without EX lock amongnodes, which gains high performance at risk of gettingstale data on other nodes.

journal_async_commit

Commit block can be written to disk without waitingfor descriptor blocks. If enabled older kernels cannotmount the device. This will enable ‘journal_checksum’internally.