From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: RAID-10 keeps aborting
Date: Wed, 12 Jun 2013 10:28:03 -0400
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In-Reply-To: <51B8153D.1040708@itwm.fraunhofer.de> (Bernd Schubert's message
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To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>, NeilBrown <neilb@suse.de>, Joe Lawrence <joe.lawrence@stratus.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, Dan Williams <dan.j.williams@gmail.com>, linux-raid <linux-raid@vger.kernel.org>
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>>>>> "Bernd" == Bernd Schubert <bernd.schubert@itwm.fraunhofer.de> writes:

Bernd> please correct me if I'm wrong, but I think the code
Bernd> optimistically enabled WRITE_SAME for any drive, except of those
Bernd> on a sata (libata) controller. 

Correct. WRITE SAME has been used extensively by RAID manufacturers for
years. So pretty much any SCSI-class drive supports it.

The headache we ran into in this case was SATA drives behind a SAS
controller.

Bernd> Martins patch should improve that (I still need to test it on our
Bernd> hardware), 

Please do! James wants a tested-by from someone that's not me before he
pushes the patch to Linus.

-- 
Martin K. Petersen	Oracle Linux Engineering