mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
18d595bf9d
Add a file for documenting SCSI sd module parameters and describe the cache_type setting. [mkp: tweaked text a bit] Signed-off-by: Weiping Zhang <zhangweiping@didichuxing.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
23 lines
786 B
Plaintext
23 lines
786 B
Plaintext
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
|