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