1 .. SPDX-License-Identifier: GPL-2.0 1 .. SPDX-License-Identifier: GPL-2.0
2 2
3 ====================================== 3 ======================================
4 Linux SCSI Disk Driver (sd) Parameters 4 Linux SCSI Disk Driver (sd) Parameters
5 ====================================== 5 ======================================
6 6
7 cache_type (RW) 7 cache_type (RW)
8 --------------- 8 ---------------
9 Enable/disable drive write & read cache. 9 Enable/disable drive write & read cache.
10 10
11 =========================== === === ====== 11 =========================== === === =========== ==========
12 cache_type string WCE RCD Write 12 cache_type string WCE RCD Write cache Read cache
13 =========================== === === ====== 13 =========================== === === =========== ==========
14 write through 0 0 off 14 write through 0 0 off on
15 none 0 1 off 15 none 0 1 off off
16 write back 1 0 on 16 write back 1 0 on on
17 write back, no read (daft) 1 1 on 17 write back, no read (daft) 1 1 on off
18 =========================== === === ====== 18 =========================== === === =========== ==========
19 19
20 To set cache type to "write back" and save thi 20 To set cache type to "write back" and save this setting to the drive::
21 21
22 # echo "write back" > cache_type 22 # echo "write back" > cache_type
23 23
24 To modify the caching mode without making the 24 To modify the caching mode without making the change persistent, prepend
25 "temporary " to the cache type string. E.g.:: 25 "temporary " to the cache type string. E.g.::
26 26
27 # echo "temporary write back" > cache_type 27 # echo "temporary write back" > cache_type
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