Re: zfs: df and zpool list report different size

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

-- 
Ståle Kristoffersen
staalebk_at_ifi.uio.no