IIRC, that's about right.  If you look at the zfs best practices wiki
(genunix.org I think?), there should be some space calculations linked
in there somewhere.

On Thu, Mar 19, 2009 at 6:50 PM, Harry Putnam <rea...@newsguy.com> wrote:
> I'm finally getting close to the setup I wanted, after quite a bit of
> experimentation and bugging these lists endlessly.
>
> So first, thanks for your tolerance and patience.
>
> My setup consists of 4 disks.  One holds the OS (rpool) and 3 more all
> the same model and brand, all 500gb.
>
> I've created a zpool in raidz1 configuration with:
>
>  zpool create  zbk raidz1  c3d0 c4d0 c4d1
>
> No errors showed up and zpool status shows no problems with those
> three:
>   pool: zbk
>  state: ONLINE
>  scrub: none requested
>  config:
>
>        NAME        STATE     READ WRITE CKSUM
>        zbk         ONLINE       0     0     0
>          raidz1    ONLINE       0     0     0
>            c3d0    ONLINE       0     0     0
>            c4d0    ONLINE       0     0     0
>            c4d1    ONLINE       0     0     0
>
>
> However, I appear to have lost an awfull lot of space... even above
> what I expercted.
>
>  df -h
> [...]
>  zbk                   913G   26K  913G   1% /zbk
>
> It appears something like 1 entire disk is gobbled up by raidz1.
>
> The same disks configured in zpool with no raidz1  shows  1.4tb with df.
>
> I was under the impression raidz1 would take something like 20%.. but
> this is more like 33.33%.
>
> So, is this to be expected or is something wrong here?
>
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>
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