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Link: https://lore.kernel.org/r/8d0b75b0faf13a2e81373570d6ce601b629fb22a.1583136624.git.mchehab+huawei@kernel.org Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
28 lines
993 B
ReStructuredText
28 lines
993 B
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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======================================
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Linux SCSI Disk Driver (sd) Parameters
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======================================
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cache_type (RW)
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---------------
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Enable/disable drive write & read cache.
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=========================== === === =========== ==========
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cache_type string WCE RCD Write cache Read cache
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=========================== === === =========== ==========
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write through 0 0 off on
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none 0 1 off off
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write back 1 0 on on
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write back, no read (daft) 1 1 on off
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=========================== === === =========== ==========
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To set cache type to "write back" and save this setting to the drive::
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# echo "write back" > cache_type
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To modify the caching mode without making the change persistent, prepend
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"temporary " to the cache type string. E.g.::
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# echo "temporary write back" > cache_type
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