[OpenIndiana-discuss] moving existing rpool onto larger disks, in-place: zpool/zfs ashift/blocksize musings

[Ben Taylor]

If you can add the third disk, why not do a zfs send/receive to put it
down on the new disk
with a new rpool name.  Then you can just move the disk around (or the
bios settings)
and do a little magic to boot to the new disk.


On Mon, May 14, 2012 at 7:00 AM, Hans J. Albertsson
<hans.j.albertsson at branneriet.se> wrote:
> I have an OI151a4 system with old 500GB disks in a mirrored pair for the
> rpool, and no further disks.
> For various reasons I'd like to expand the available space by replacing the
> 500GB disks with 2TB disks.
> I'd like to do this IN-PLACE, but I see a few problems in that the new disks
> are naturally 4K blocksize, but falsely report 512 byte blocksize.
>
> First: Can you ever efficiently migrate a zpool with ashift=9 to a 4k block
> disk by just adding the new disk as a 3rd mirror? Regardless of what
> blocksize the disk reports?
>
> Second: Can you manage the problem of the false blocksize report in a
> situation like this?
>
> Third: How can one check to see  what parameters (like ashift( a particular
> pool uses?
>
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