1.. SPDX-License-Identifier: GPL-2.0 2 3====================================== 4Linux SCSI Disk Driver (sd) Parameters 5====================================== 6 7cache_type (RW) 8--------------- 9Enable/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 20To set cache type to "write back" and save this setting to the drive:: 21 22 # echo "write back" > cache_type 23 24To 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 28