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Date:	Sat, 26 Jul 2014 13:44:08 +0000
From:	KY Srinivasan <>
To:	"Martin K. Petersen" <>
CC:	Sitsofe Wheeler <>,
	Christoph Hellwig <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>
Subject: RE: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests

> -----Original Message-----
> From: Martin K. Petersen []
> Sent: Friday, July 25, 2014 9:57 AM
> To: KY Srinivasan
> Cc: Martin K. Petersen; Sitsofe Wheeler; Christoph Hellwig;
>;; linux-
> Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests
> >>>>> "KY" == KY Srinivasan <> 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?


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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