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

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Message-ID: <yq1a9ezocrg.fsf@sermon.lab.mkp.net>
Date:	Mon, 13 Jan 2014 15:19:47 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"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

>>>>> "nab" == Nicholas A Bellinger <nab@...ux-iscsi.org> writes:

>> What proposed 16 byte scheme?  The only DIF proposals I know for
>> SBC-4 are 13-185R0 and 12-369R0 and that's a couple of new algorithms
>> and types because we cannot change the 8 byte PI.

nab> Then I'm probably getting the SBC version wrong..  It's the one
nab> that includes using CRC32C for the block guard, and larger space
nab> for reference tag as mentioned by MKP.

This is the Type 4 we have been shopping among various vendors. It
predates and is simpler than HP's proposal (which met resistance in T10
and was subsequently dropped). So we revived our original Type 4
proposal which is 16 bytes of protection information per interval
(CRC32C, 48-bit LBA and 6 bytes of app tag). The proposal has been
sitting around for a while waiting for SBC-4 to open.

-- 
Martin K. Petersen	Oracle Linux Engineering
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