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Date:	Sat, 26 Jul 2014 13:44:08 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	Sitsofe Wheeler <sitsofe@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests



> -----Original Message-----
> From: Martin K. Petersen [mailto:martin.petersen@...cle.com]
> Sent: Friday, July 25, 2014 9:57 AM
> To: KY Srinivasan
> Cc: Martin K. Petersen; Sitsofe Wheeler; Christoph Hellwig;
> gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; ohering@...e.com; apw@...onical.com;
> jasowang@...hat.com; jbottomley@...allels.com; linux-
> scsi@...r.kernel.org
> Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests
> 
> >>>>> "KY" == KY Srinivasan <kys@...rosoft.com> writes:
> 
> KY> For the pass through case, the host validates the request and passes
> KY> the request to the device.  However, not all scsi commands are
> KY> passed through even though the device it is being passed through may
> KY> support the command. WRITE_SAME is one such command.
> Consequently,
> KY> in the EVPD page, we will set state indicating that WRITE_SAME is
> KY> not supported (even if the device supports it).
> 
> The LBP VPD page flags UNMAP as being supported. Do you actually support
> UNMAP to DSM TRIM SCSI-ATA translation?

Martin,

I have been told by the Windows folks that this is done. I am trying to get
additional details.

K. Y
> 
> One challenge in that department is that a single UNMAP command may turn
> into many, many, many DSM TRIM commands on the underlying SATA
> device.
> That's why we went with WRITE SAME for the internal Linux SATL, capping
> the maximum number of blocks to what we can fit in a single DSM TRIM
> command.
> 
> --
> Martin K. Petersen	Oracle Linux Engineering
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