From: Mike Snitzer <snitzer@redhat.com>
To: Phillip Susi <psusi@ubuntu.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Non 512 byte sectors
Date: Fri, 14 Dec 2012 14:29:53 -0500 [thread overview]
Message-ID: <20121214192953.GB3148@redhat.com> (raw)
In-Reply-To: <50C9F2D6.7090802@ubuntu.com>
On Thu, Dec 13 2012 at 10:23am -0500,
Phillip Susi <psusi@ubuntu.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
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> Is it possible to get dm to report > 512 byte sector size? If so, how?
DM will automatically stack the physical and logical sector sizes based
on the devices that are assembled into the DM device.
So if you create an LV on a 4K device the associated DM device will
report the same physical and logical block size. You can verify as much
by looking at:
/sys/block/dm-X/queue/physical_block_size
/sys/block/dm-X/queue/logical_block_size
There are more details about IO limits stacking here:
http://people.redhat.com/msnitzer/docs/io-limits.txt
next prev parent reply other threads:[~2012-12-14 19:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-13 15:23 [linux-lvm] Non 512 byte sectors Phillip Susi
2012-12-14 18:52 ` Stuart D Gathman
2012-12-14 19:29 ` Mike Snitzer [this message]
2012-12-14 19:56 ` Phillip Susi
2012-12-14 20:10 ` Mike Snitzer
2012-12-14 22:05 ` Phillip Susi
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