| .. 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 |