Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/scsi/sd-parameters.rst b/Documentation/scsi/sd-parameters.rst
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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