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Re: [linux-lvm] Non 512 byte sectors



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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