ZFS and df weirdness

[Dan Naumov]

On Sun, Jul 5, 2009 at 2:26 AM, Freddie Cash<fjwcash at gmail.com> wrote:
>
>
> On Sat, Jul 4, 2009 at 2:55 PM, Dan Naumov <dan.naumov at gmail.com> wrote:
>>
>> Hello list.
>>
>> I have a single 2tb disk used on a 7.2-release/amd64 system with a
>> small part of it given to UFS and most of the disk given to a single
>> "simple" zfs pool with several filesystems without redundancy. I've
>> noticed a really weird thing regarding what "df" reports regarding the
>> "total space" of one of my filesystems:
>>
>> atom# df -h
>> Filesystem         Size    Used   Avail Capacity  Mounted on
>> /dev/ad12s1a        15G    1.0G     13G     7%    /
>> devfs              1.0K    1.0K      0B   100%    /dev
>> linprocfs          4.0K    4.0K      0B   100%    /usr/compat/linux/proc
>> tank/DATA          1.8T    292G    1.5T    16%    /DATA
>> tank/home          1.5T      0B    1.5T     0%    /home
>> tank/home/jago     1.5T    128K    1.5T     0%    /home/jago
>> tank/home/karni    1.5T      0B    1.5T     0%    /home/karni
>> tank/usr/local     1.5T    455M    1.5T     0%    /usr/local
>> tank/usr/obj       1.5T      0B    1.5T     0%    /usr/obj
>> tank/usr/ports     1.5T    412M    1.5T     0%    /usr/ports
>> tank/usr/src       1.5T    495M    1.5T     0%    /usr/src
>> tank/var/log       1.5T    256K    1.5T     0%    /var/log
>>
>> Considering that every single filesystem is part of the exact same
>> pool, with no custom options whatsoever used during filesystem
>> creation (except for mountpoints), why is the size of tank/DATA 1.8T
>> while the others are 1.5T?
>
> Did you set a reservation for any of the other filesystems?  Reserved space
> is not listed in the "general" pool.

no custom options whatsoever were used during filesystem creation
(except for mountpoints).

- Dan