FreeBSD 10.1 + ZFS

Jon Radel jon at
Wed May 27 20:42:33 UTC 2015

On 5/27/15 3:27 PM, Baho Utot wrote:
> I do understand how ZFS works I am using it (ZFS RAID-Z1) on three 
> boxen but not as the root file system.
> You cannot do RAID-Z2 with three drives only as RAID-Z2 has two parity 
> drives
You either contradict yourself or you have a shaky understanding of the 
word "cannot".  Not recommended, quite possibly not the best way to use 
3 disks, sure....    Cannot, well, not so much.

Personally, I think this discussion might have gotten off to a much 
better start if you'd started out by telling us that you couldn't use 
the installer because you weren't in a position to use your entire 
disks; all of which is entirely absent in your initial mail.

Several people have now given you links to various cookbooks for doing 
what I understand you want to do, or more precisely, as close as 
anything published is likely to be to meeting your exact needs. Pick one 
and see how it goes.  I'd suggest really good backups first.

--Jon Radel
jon at

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