From: Salyzyn, Mark <Mark_Salyzyn@adaptec.com>
Date: Tue, 8 Jan 2008 20:01:07 +0000 (-0800)
Subject: [SCSI] aacraid: add parameter to control FUA and SYNCHRONIZE_CACHE policy
X-Git-Tag: v2.6.25-rc1~1230^2~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95e852e1ef165560e85d3012127068c8f08b19a1;p=pandora-kernel.git

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

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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