[SCSI] aacraid: add parameter to control FUA and SYNCHRONIZE_CACHE policy

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aacraid.cache parameter, Disable Queue Flush commands:
        bit 0 - Disable FUA in WRITE SCSI commands
        bit 1 - Disable SYNCHRONIZE_CACHE SCSI command
        bit 2 - Disable only if Battery not protecting adapter supplied Cache

e.g.: aacraid.cache=7 will disable the FUA and SYNCHRONIZE_CACHE
commands if the adapter has reported that it's cache is battery backed
up.

This parameter permits experimentation with tradeoffs between
performance and caching policy.

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

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Salyzyn, Mark 2008-01-08 12:01:07 -08:00 • committed by James Bottomley

parent 9b161a4d3e

commit 95e852e1ef

3 changed files with 30 additions and 12 deletions

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36

drivers/scsi/aacraid/aachba.c

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2

drivers/scsi/aacraid/aacraid.h

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4

drivers/scsi/aacraid/commsup.c

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