I just realized you're probably wanting to copy your data to the new pool
which is especially trivial. Just open a terminal window, start the
send-receive and use job control to start and stop the stream as needed.
If you need to shut the system down, you'll have to break up the stream using
dd if it's a single 30 TB filesystem which will be a lot more difficult and
incur lots of overhead when you restart the job. But hopefully you planned
ahead and used several file systems. If not, now would be a good time to do
that. Add some disk to the old pool, create a transfer file system and migrate
portions of the data into the transfer file system.
FWIW It seems to me that you could have simply added disk to your existing pool
and balanced the data across the disks by making local copies. For example:
mkdir new
cp -r old new
rm -rf old
mv new old
If zfs was written properly, which I suspect is the case, once all the data had
been copied once, you'd have it evenly distributed over the enlarged pool.
Have Fun!
Reg
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