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