I have a small stack of disks that I was considering putting in a box to build 
a backup server. It would only store data that is duplicated elsewhere, so I 
wouldn't really need redundancy at the disk layer. The biggest issue is that 
the disks are not all the same size. So I can't really do a raidz or mirror 
with them anyway. So I was considering just putting them all in one pool. My 
question is how does zpool behave if I lose one disk in this pool? Can I still 
access the data on the other disks? Or is it like a traditional raid0 and I 
lose the whole pool? Is there a better way to deal with this, using my old 
mismatched hardware? 

Yes, I could probably build a raidz by partitioning and such, but I'd like to 
avoid the complexity. I'd probably just use zfs send/recv to send snapshots 
over or perhaps crashplan.
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