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