From: "Martin K. Petersen" Subject: Re: 3.12.0: sda2: WRITE SAME failed. Manually zeroing. with 3w-xxxx driver Date: Thu, 28 Nov 2013 07:59:53 -0500 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain Cc: open list , linux-ext4@vger.kernel.org, linux-scsi@vger.kernel.org To: Justin Piszcz Return-path: In-Reply-To: (Justin Piszcz's message of "Mon, 25 Nov 2013 17:01:12 -0500") Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org >>>>> "Justin" == Justin Piszcz 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