[linux-lvm] Non 512 byte sectors
Stuart D Gathman
stuart at bmsi.com
Fri Dec 14 18:52:39 UTC 2012
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.
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