Have you got any other disk which can format as ashift=12?
(You could even use an iSCSI LUN from another system with blocksize set
to 4k.)
If so, start by creating a zpool on that. Then attach your USB drive as
a mirror, and it will have ashift=12. Then detach the original disk from
the mirror, and expand the zpool to fill the whole drive.
Yes, we should have a command line option to set the ashift given how
much trouble the failure to autodetect is causing in many cases (and you
may want to override even a correct autodetect).
ashift is really a per-top level vdev property rather than a pool
property, and we don't currently have any top level vdev properties
handled by the zpool command.
However, for your usage case of just storing large send streams, I
wouldn't go to any extra bother just to create ashift=12. There are
other situations where it might actually make a noticeable difference,
but I would be surprised if you see any in this case. You also reduce
the scope for rescue if the pool gets damaged, as ashift=12 has only 32
previous uberblocks available to work back through (versus 128 for
ashift=9).
--
Andrew
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