From: Stuart D Gathman <stuart@bmsi.com>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] Non 512 byte sectors
Date: Fri, 14 Dec 2012 13:52:39 -0500 [thread overview]
Message-ID: <50CB7577.4050906@bmsi.com> (raw)
In-Reply-To: <50C9F2D6.7090802@ubuntu.com>
On 12/13/2012 10:23 AM, Phillip Susi expounded in part:
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> Is it possible to get dm to report > 512 byte sector size? If so, how?
>
>
blockdev --getss /dev/vg/lv (or any other block device)
That is probably logical sector size, however. The only way I know to
get physical sector size is:
hdparm -I /dev/sda
which reports logical and physical sector size. Some WD devices are
known to lie about physical sector size, however.
If you always align stuff to 4096, there won't be a problem. In fact,
new technology tends to have much larger alignment requirements for
optimum performance - say 128k, the size of an erase block, or 64k for a
RAID chunk size. So aligning everything to 1M should hold you for a while.
next prev parent reply other threads:[~2012-12-14 18:52 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 [this message]
2012-12-14 19:29 ` Mike Snitzer
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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