Janek Kozicki <janek_listy@xxxxx> writes:
> Doug Ledford said: (by the date of Sat, 03 Nov 2007 14:40:48 -0400)
>
>> so you really only need to align the
>> lvm superblock so that data starts at 128K offset into the raid array.
>
> Sorry, I thought that it will be easier to figure this out
> experimentally - put LVM here or there, write 128k of data to the
> disc (inside LVM partition), then see (with hexedit) if this data is
> really split across several discs or not.
>
> In fact I even managed to find where LVM superblock starts inside
> RAID, the problem for me was that I wasn't sure where it ends, and
> where the actual data, starts, and *THAT* data has to be aligned on
> 128K offset. Now I know that I should simply look more carefully at
> LVM manuals, to see exactly what is the size of LVM superblock.
I would just check with "dmsetup table dev" to which byte offsets the
logical volume gets mapped to.
MfG
Goswin
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