linux-ext4 - Re: 3.12.0: sda2: WRITE SAME failed. Manually zeroing. with 3w-xxxx driver

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Message-ID: <yq1iovclm0m.fsf@sermon.lab.mkp.net>
Date:	Thu, 28 Nov 2013 07:59:53 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	open list <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: 3.12.0: sda2: WRITE SAME failed. Manually zeroing. with 3w-xxxx driver

>>>>> "Justin" == Justin Piszcz <jpiszcz@...idpixels.com> writes:

Justin> Relevant logs: [178339.353519] 3w-sas: scsi0: ERROR:
Justin> (0x03:0x0101): Invalid command opcode:opcode=0x41.
Justin> [178339.353565] sda2: WRITE SAME failed. Manually zeroing.

Justin> Is this something I should be worried about? 

No, it just means that your 3ware controller does not handle the WRITE
SAME command and we fall back to manually writing out zeroes.

I posted a patch a while back that prevents WRITE SAME being issued for
controllers that do not pass the commands through to disk directly:

	http://marc.info/?l=linux-scsi&m=138252394614920&w=2

-- 
Martin K. Petersen	Oracle Linux Engineering
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