The ability to expand (and, to a less extent, shrink) a RAIDZ or RAIDZ2
device is actually one of the more critical missing features from ZFS,
IMHO. It is very common for folks to add additional shelf or shelves
into an existing array setup, and if you have created a pool which uses
RAIDZ across the shelves (a good idea), then you want to add the new
shelves into the existing RAIDZ setup.
Honestly, you really don't want to lose any snapshots of this either.
I've talked to quite a few people who manage a good amount of storage
(and I do too), and the scenario of being able to easily integrate and
migrate ZFS pools around comes up often. Honestly, I'd be interested in
seeing how other people feel, but I'm really waiting for more
flexibility to add and remove disks from a pool. The current ZFS
limitations are quite exacerbating when you deal with large amounts of
disks whose arrangement changes frequently.
-Erik
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