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

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Date:	Thu, 28 Nov 2013 08:07:24 -0500
From:	"Justin Piszcz" <jpiszcz@...idpixels.com>
To:	"'Martin K. Petersen'" <martin.petersen@...cle.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

-----Original Message-----
From: Martin K. Petersen [mailto:martin.petersen@...cle.com] 
Sent: Thursday, November 28, 2013 8:00 AM
To: Justin Piszcz
Cc: open list; 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

[ .. ]

Awesome, thank you!  This patch is over a month old, do you know if is
currently in mainline?  I'll also update my case with 3ware/LSI.

Justin.

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