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Diffstat (limited to 'Documentation/scsi/sd-parameters.rst')
| -rw-r--r-- | Documentation/scsi/sd-parameters.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/scsi/sd-parameters.rst b/Documentation/scsi/sd-parameters.rst new file mode 100644 index 000000000000..87d554008bfb --- /dev/null +++ b/Documentation/scsi/sd-parameters.rst @@ -0,0 +1,27 @@ +.. 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 |