From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Martin K. Petersen" Subject: Re: [PATCH 09/14] target/configfs: Expose protection device attributes Date: Mon, 13 Jan 2014 15:30:12 -0500 Message-ID: References: <1389212157-14540-1-git-send-email-nab@daterainc.com> <1389212157-14540-10-git-send-email-nab@daterainc.com> <1389637859.5567.431.camel@haakon3.risingtidesystems.com> <1389639177.12062.21.camel@dabdike.int.hansenpartnership.com> <1389641243.5567.445.camel@haakon3.risingtidesystems.com> <1389644643.12062.42.camel@dabdike.int.hansenpartnership.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1389644643.12062.42.camel@dabdike.int.hansenpartnership.com> (James Bottomley's message of "Mon, 13 Jan 2014 12:24:03 -0800") Sender: target-devel-owner@vger.kernel.org To: James Bottomley Cc: "Martin K. Petersen" , "Nicholas A. Bellinger" , "Nicholas A. Bellinger" , target-devel , linux-scsi , linux-kernel , Christoph Hellwig , Hannes Reinecke , Sagi Grimberg , Or Gerlitz List-Id: linux-scsi@vger.kernel.org >>>>> "James" == James Bottomley writes: James> I'm intrigued by this: how do you get the extra space, since I James> heard all the drive vendors were adamant that 520 was it for the James> current manufacturing processes. Well, you've been able to get 528-byte sector drives for a long time. They are used inside arrays that use both PI and internal metadata. In any case Type 4 was never intended for 512-byte sectors. The existing 16-bit T10 CRC is pretty useless for 4096-byte blocks so the proposal was aimed at 4096+16 (but obviously that tidbit is outside of the T10 spec that doesn't mandate block sizes or accompanying PI types). -- Martin K. Petersen Oracle Linux Engineering