| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 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 |