tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
scsi: sd: Documentation: add sd-parameters.txt
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>
authored by
Weiping Zhang
and committed by
Martin K. Petersen
18d595bf
29e79e0f
+22
+22
Documentation/scsi/sd-parameters.txt
+22
Documentation/scsi/sd-parameters.txt
···
1
+
Linux SCSI Disk Driver (sd) Parameters
2
+
======================================
3
+
4
+
cache_type (RW)
5
+
---------------
6
+
Enable/disable drive write & read cache.
7
+
8
+
cache_type string | WCE RCD | Write cache | Read cache
9
+
----------------------------+---------+-------------+------------
10
+
write through | 0 0 | off | on
11
+
none | 0 1 | off | off
12
+
write back | 1 0 | on | on
13
+
write back, no read (daft) | 1 1 | on | off
14
+
15
+
To set cache type to "write back" and save this setting to the drive:
16
+
17
+
# echo "write back" > cache_type
18
+
19
+
To modify the caching mode without making the change persistent, prepend
20
+
"temporary " to the cache type string. E.g.:
21
+
22
+
# echo "temporary write back" > cache_type