MC,

If you originally had 4 * 500 GB disks configured in RAID-Z, you cannot add 1 single disk and grow
the capacity of the pool (with same protection). This is not allowed.

Regards,
Sanjeev.

MC wrote:
Two conflicting answers to the same question?  I guess we need someone to break 
the tie :)

Hello,

I have been reading alot of good things about Raid-z,
but before I jump into it I have one unanswered
question i can't find a clear answer for.

Is it possible to enlarge the initial RAID size by
adding single drives later on?

If i start off with 4*500gb (should give me 1.5tb),
can I add one 500gb to the raid later, and will the
total size then grow 500gb and still have the same
protection?
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