Hi,
i'm new to the list so please bare with me. This isn't an OpenSolaris
related problem but i hope it's still the right list to post to.

I'm on the way to move a backup server to using zfs based storage, but i
don't want to spend too much drives to parity (the 16 drives are attached
to a 3ware raid controller so i could also just use raid6 there).

I want to be able to sustain two parallel drive failures so i need
raidz2. The man page of zpool says the recommended vdev size is
somewhere between 3-9 drives (for raidz). Is this just for getting the
best performance or are there stability issues ?

There won't be anything like heavy multi-user IO on this machine so
couldn't i just put all 16 drive in one raidz2 and have all the benefits
of zfs without sacrificing 2 extra drives to parity (compared to raid6)?

Thanks in Advance,
Leon

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