| .. SPDX-License-Identifier: GPL-2.0 |
| |
| ====================================== |
| 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 |
