From: Matthew Wilcox <matthew@wil.cx>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jeff Garzik <jeff@garzik.org>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Jens Axboe <jens.axboe@oracle.com>,
rwheeler@redhat.com, snitzer@redhat.com, neilb@suse.de,
dgilbert@interlog.com, linux-ide@vger.kernel.org,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH 5 of 8] sd: Detect non-rotational devices
Date: Thu, 23 Apr 2009 08:16:44 -0600 [thread overview]
Message-ID: <20090423141644.GP1926@parisc-linux.org> (raw)
In-Reply-To: <1240495814.3514.8.camel@mulgrave.int.hansenpartnership.com>
On Thu, Apr 23, 2009 at 02:10:13PM +0000, James Bottomley wrote:
> I'm with Jeff on this one. We had an identically similar problem with
> REPORT LUNS, which, today is the basis of SCSI discovery.
Yes, REPORT LUNS is quite essential.
It's not exactly in the same category as reporting device form factor
and rotational speed. If REPORT LUNS is wrong, we're in really deep
trouble. If device form factr is wrong ... umm ... nothing much happens.
If rotational speed is wrong, we might have a suboptimal IO pattern.
It's also fixable by udev.
The current check for is_ssd (that doesn't check the version) was put
in for 2.6.27. It doesn't appear to have caused any trouble.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2009-04-23 14:16 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-23 5:29 [PATCH 0 of 8] I/O topology patch kit Martin K. Petersen
2009-04-23 5:29 ` [PATCH 1 of 8] block: Expose stacked device queues in sysfs Martin K. Petersen
2009-04-23 5:29 ` [PATCH 2 of 8] block: Export I/O topology for block devices and partitions Martin K. Petersen
2009-04-23 10:51 ` Jens Axboe
2009-04-23 11:49 ` Matthew Wilcox
2009-04-23 11:55 ` Jens Axboe
2009-04-23 13:22 ` Matthew Wilcox
2009-04-23 13:30 ` Matthew Wilcox
2009-04-23 13:17 ` Martin K. Petersen
2009-04-23 18:13 ` Konrad Rzeszutek
2009-04-23 18:26 ` Ric Wheeler
2009-04-23 18:44 ` Matthew Wilcox
2009-04-23 18:34 ` Martin K. Petersen
2009-04-23 5:29 ` [PATCH 3 of 8] MD: Use new topology calls to indicate alignment and I/O sizes Martin K. Petersen
2009-04-23 5:29 ` [PATCH 4 of 8] sd: Physical block size and alignment support Martin K. Petersen
2009-04-23 16:37 ` Konrad Rzeszutek
2009-04-23 18:25 ` Martin K. Petersen
2009-04-23 18:44 ` Konrad Rzeszutek
2009-04-23 19:02 ` Martin K. Petersen
2009-04-23 5:29 ` [PATCH 5 of 8] sd: Detect non-rotational devices Martin K. Petersen
2009-04-23 10:52 ` Jens Axboe
2009-04-23 11:09 ` Jeff Garzik
2009-04-23 11:13 ` Jens Axboe
2009-04-23 11:22 ` Jeff Garzik
2009-04-23 11:38 ` Matthew Wilcox
2009-04-23 11:58 ` Jeff Garzik
2009-04-23 12:03 ` Jens Axboe
2009-04-23 13:16 ` Martin K. Petersen
2009-04-23 13:33 ` Jeff Garzik
2009-04-23 14:10 ` James Bottomley
2009-04-23 14:16 ` Matthew Wilcox [this message]
2009-04-23 14:39 ` Jeff Garzik
2009-04-23 17:25 ` Matthew Wilcox
2009-04-23 17:37 ` James Bottomley
2009-04-23 5:29 ` [PATCH 6 of 8] sd: Block limits VPD support Martin K. Petersen
2009-04-23 5:29 ` [PATCH 7 of 8] scsi_debug: Add support for physical block exponent and alignment Martin K. Petersen
2009-04-23 5:29 ` [PATCH 8 of 8] libata: Report disk alignment and physical block size Martin K. Petersen
2009-04-23 13:46 ` Matthew Wilcox
2009-04-23 14:05 ` Martin K. Petersen
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