William Saadi wrote:
> Hi all,
>
> I have a little question.
> WIth RAID-Z rules, what is the true usable disks space?
>   

It depends on what data you write to it, how the writes are done, and
what compression or redundancy parameters are set.

> Is there a calcul like any RAID (ex. RAID5 = nb of disks - 1 for parity)?
>   

In general, by default, yes, this will work.  raidz approximates raid-5,
raidz2 approximates raid-6.
 -- richard

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