.....(clip) so I was thinking of front-ending the collocated storage pools
with non-collocated pools,...

Isn't that called a diskpool??!? ;>)

Seriously, if you are worried about wear and tear, the easiest (and probably
cheapest) way to solve that problem is just to put a big enough pool of
inexpensive/ATA disks to hold the data until the weekend!  No issues with
single-threading, either.

You can go ahead and make your offsite (non-collocated) copy pool backups
while the data is still in the disk pool, so you don't have any exposure to
failure in the disk pool.


 WandaWanda Prather
"I/O, I/O, It's all about I/O"  -(me)