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SDK_SG200x_V2/linux_5.10/Documentation/scsi/sd-parameters.rst
carbon 0545e9dc6d init version 2024-05-07
commit d1edce71135cc6d98c0a4b5729774542b676e769
Author: sophgo-forum-service <forum_service@sophgo.com>
Date:   Fri Mar 15 16:07:33 2024 +0800

    [fix] recommend using ssh method to clone repo.
    [fix] fix sensor driver repo branch name.
2024-05-07 19:36:36 +08:00

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.. 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