As a novice, I undestand that if you don't have any redundancy between vdevs
this is going to be a problem. Perhaps you can add mirroring to your existing
pool and make it work that way?
A pool made up of mirror pairs:
{cyrus4:137} zpool status
pool: ms2
state: ONLINE
scrub: scrub completed with 0 errors on Sun Jul 22 00:47:51 2007
config:
NAME STATE READ WRITE CKSUM
ms2 ONLINE 0 0 0
mirror ONLINE 0 0 0
c4t600C0FF0000000000A7E0A0E6F8A1000d0 ONLINE 0 0 0
c4t600C0FF0000000000A7E8D1EA7178800d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c4t600C0FF0000000000A7E0A7219D78100d0 ONLINE 0 0 0
c4t600C0FF0000000000A7E8D7B3709D800d0 ONLINE 0 0 0
errors: No known data errors
So remove a half of the mirror and replace it with a larger one. Wait for
everything to synch up, then remove the other half and add a large one.
Suddenly pool expands.
Alternatively setup new arrrays on a 2nd server, and use zfs send and receive
to duplicate data.
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