From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Sitsofe Wheeler <sitsofe@gmail.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
devel@linuxdriverproject.org
Subject: Re: [PATCH 0/3] scsi: Add Hyper-V logical block provisioning quirks
Date: Sat, 11 Oct 2014 10:41:53 -0700 [thread overview]
Message-ID: <1413049313.2068.48.camel@jarvis.lan> (raw)
In-Reply-To: <20141011173902.GA1946@infradead.org>
On Sat, 2014-10-11 at 10:39 -0700, Christoph Hellwig wrote:
> On Fri, Oct 10, 2014 at 08:49:01AM +0100, Sitsofe Wheeler wrote:
> > Microsoft Hyper-V virtual disks currently only claim SPC-2 compliance
> > even though they implement post SPC-2 features (such as thin
> > provisioning) which means the Linux kernel does not go on to test for
> > those features even though they are advertised.
> >
> > A previous patch attempted to add a quirk to workaround this but the
> > quirk was only enabled after the features had been scanned for, wouldn't
> > work for "small" disks and would quirk on all Hyper-V SCSI devices
> > (e.g. passthrough disks).
> >
> > The new patches partially revert the previous effort, add the quirk in a
> > more traditional manner to only Hyper-V virtual disks and work on small
> > virtual disks.
>
> This seems like might want a quirk to simply "force" a SPC3 compliance
> level?
This was initially suggested, but rejected by Microsoft because of other
problems advertising SPC-3 compliance brings. Perhaps the hyper-v
emulator has matured sufficiently that it will now work OK?
James
next prev parent reply other threads:[~2014-10-11 17:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-10 7:49 [PATCH 0/3] scsi: Add Hyper-V logical block provisioning quirks Sitsofe Wheeler
2014-10-10 7:51 ` [PATCH 1/3] Revert "Drivers: add blist flags" Sitsofe Wheeler
2014-10-10 7:52 ` [PATCH 2/3] scsi: add try_rc16 blacklist flag Sitsofe Wheeler
2014-10-15 1:08 ` Martin K. Petersen
2014-10-15 2:07 ` KY Srinivasan
2014-10-21 4:21 ` Sitsofe Wheeler
2014-10-23 1:46 ` Martin K. Petersen
2014-10-10 7:55 ` [PATCH 3/3] scsi: Use try_rc16 and try_vpd_pages quirks on Hyper-V virtual disks Sitsofe Wheeler
2014-10-11 17:39 ` [PATCH 0/3] scsi: Add Hyper-V logical block provisioning quirks Christoph Hellwig
2014-10-11 17:41 ` James Bottomley [this message]
2014-10-11 19:48 ` KY Srinivasan
2014-10-11 20:22 ` Jeff Leung
2014-10-12 1:21 ` KY Srinivasan
2014-10-21 4:45 ` Sitsofe Wheeler
2014-10-21 5:19 ` Jeff Leung
2014-10-21 18:30 ` KY Srinivasan
2014-10-15 1:06 ` Martin K. Petersen
2014-10-21 4:17 ` Sitsofe Wheeler
2014-10-23 1:50 ` Martin K. Petersen
2014-10-23 9:03 ` Sitsofe Wheeler
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