Linux SCSI Disk Driver (sd) Parameters¶
cache_type (RW)¶
Enable/disable drive write & read cache.
| cache_type string | WCE | RCD | Write cache | Read cache |
|---|---|---|---|---|
| write through | 0 | 0 | off | on |
| none | 0 | 1 | off | off |
| write back | 1 | 0 | on | on |
| write back, no read (daft) | 1 | 1 | on | off |
To set cache type to “write back” and save this setting to the drive:
# echo "write back" > cache_type
To modify the caching mode without making the change persistent, prepend“temporary ” to the cache type string. E.g.:
# echo "temporary write back" > cache_type