From: Brian King <brking@us.ibm.com>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: SCSI Mailing List <linux-scsi@vger.kernel.org>, haren@us.ibm.com
Subject: Re: [PATCH 1/1] ipr: Fix for adapter shutdown issue
Date: Wed, 15 Jun 2005 10:34:52 -0500 [thread overview]
Message-ID: <42B04A9C.7050503@us.ibm.com> (raw)
In-Reply-To: <1118849292.5045.27.camel@mulgrave>
James Bottomley wrote:
> On Wed, 2005-06-15 at 10:15 -0500, brking@us.ibm.com wrote:
>
>>Haren found this in some recent kexec testing. Without this fix, the
>>ipr adapter's write cache never gets flushed. I'd like to see this
>>pushed into 2.6.12 if possible.
>
>
> Just out of curiosity, what are you doing with the SYNCHRONIZE_CACHE
> that comes down from sd on shutdown?
For scsi disks attached to an ipr adapter, the SYNCHRONIZE_CACHE command
gets sent to the disk and works just like when attached to any other
HBA. The ipr disk array devices, however, do not support the SYNC_CACHE command,
nor do they support the caching mode page, so SYNC_CACHE never gets sent.
So, the shutdown hook is needed to flush the adapter's battery backed write
cache for all attached disk arrays on system shutdown.
--
Brian King
eServer Storage I/O
IBM Linux Technology Center
next prev parent reply other threads:[~2005-06-15 15:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-15 15:15 [PATCH 1/1] ipr: Fix for adapter shutdown issue brking
2005-06-15 15:17 ` Christoph Hellwig
2005-06-15 16:01 ` Greg KH
2005-06-15 16:14 ` Brian King
2005-06-15 15:28 ` James Bottomley
2005-06-15 15:34 ` Brian King [this message]
2005-06-15 15:47 ` James Bottomley
2005-06-15 16:11 ` Brian King
2005-06-15 16:44 ` James Bottomley
2005-06-15 17:05 ` Patrick Mansfield
2005-06-15 17:23 ` James Bottomley
2005-06-16 12:00 ` Jens Axboe
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