> The other point is, how many other volume management systems allow you
> to remove disks?  I bet if the answer is not zero, it's not large.  ;)

As far as Solaris is concerned, I'm only aware of two significant such
systems.  SVM and VxVM.

SVM doesn't really manage disks per-se.  So there's really nothing in it
that disallows removing them or reusing them.  Of course it offers no
help in migrating data off of any such disks.

VxVM does have tools to migrate data from a disk, and to either remove a
disk from a pool, or even migrate data on a disk into another pool.  In
many cases, enterprise customers have this existing functionality in
mind when considering ZFS.

As a third point, follow the Network Appliance list a bit and you'll see
that the question comes up with their systems fairly often.  It's not
uncommon for someone to accidentally add a spare disk to a volume or
aggregate.  Said disk cannot be retreived without destroying and
recreating (a blank) volume or aggregate, followed by a restore.  

See also ZFS automatically increasing the size of a pool to take up all
space, even if I don't want it to...

-- 
Darren Dunham                                           [EMAIL PROTECTED]
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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