zfs: df and zpool list report different size

[Joao Barros]

On 4/26/07, Ståle Kristoffersen <staalebk at ifi.uio.no> wrote:
> On 2007-04-26 at 16:36, Ollivier Robert wrote:
> > According to Alexandre Biancalana:
> > >  # zpool create backup raidz ad9 ad11
> >
> > Note, raidz with two disks is almost the same as a mirror so the real,
> > usable space is half.  In raidz, if you have N disks, the total usable
> > capacity is N-1.
>
> Well, that would have been fine if it did the same thing with a mirror, but
> thats not the case:
>
>
> # zpool create test raidz ad1 ad2 ad3
> # zpool list
> NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
> test                   1.48G    773M    747M    50%  ONLINE     -
> # df -ht zfs
> Filesystem     Size    Used   Avail Capacity  Mounted on
> test           980M     32K    980M     0%    /test
>
> # zpool destroy test
> # zpool create test mirror ad1 ad2
> # zpool list
> NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
> test                    504M     88K    504M     0%  ONLINE     -
> # df -ht zfs
> Filesystem     Size    Used   Avail Capacity  Mounted on
> test           472M     32K    472M     0%    /test
>

Try creating the raidz with 2 disks like Alexandre did...

-- 
Joao Barros