> Such configuration was known to cause deadlocks. Even if it works now (which 
> I don't expect to be the case) it will make your data to be cached twice. The 
> CPU utilization > will also be much higher, etc.
> All in all I strongly recommend against such setup.

> -- 
> Pawel Jakub Dawidek                       http://www.wheelsystems.com
> p...@freebsd.org                           http://www.FreeBSD.org
> FreeBSD committer                         Am I Evil? Yes, I Am!

Well, CPU utilization can be tuned downwards by disabling checksums in inner 
pools as checksumming is done in main pool. I'd be interested in bug id's for 
deadlock issues and everything related. Caching twice is not an issue, 
prefetching could be and it can be disabled
I don't understand what makes it difficult for zfs to handle this kind of 
setup. Main pool (testpool) should just allow any writes/reads to/from volume, 
not caring what they are, where as anotherpool would just work as any other 
pool consisting of any other devices.
This is quite similar setup to iscsi-replicated mirror pool, where you have 
redundant pool created from iscsi volumes locally and remotely. 

Yours
Markus Kovero
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