linux-kernel - Re: [PATCH 09/14] target/configfs: Expose protection device attributes

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Message-ID: <yq138kroca3.fsf@sermon.lab.mkp.net>
Date:	Mon, 13 Jan 2014 15:30:12 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Sagi Grimberg <sagig@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>
Subject: Re: [PATCH 09/14] target/configfs: Expose protection device attributes

>>>>> "James" == James Bottomley <James.Bottomley@...senPartnership.com> 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
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