ZFS command can block the whole ZFS subsystem!

[O. Hartmann]

On Sun, 5 Jan 2014 09:10:04 +1100
Peter Jeremy <peter at rulingia.com> wrote:

> On 2014-Jan-03 20:25:35 +0100, "O. Hartmann"
> <ohartman at zedat.fu-berlin.de> wrote:
> >[~] zfs get all BACKUP00
> >NAME      PROPERTY              VALUE                 SOURCE
> ...
> >BACKUP00  usedbysnapshots       0                     -
> >BACKUP00  usedbydataset         144K                  -
> >BACKUP00  usedbychildren        2.53T                 -
> >BACKUP00  usedbyrefreservation  0                     -
> 
> >Funny, the disk is supposed to be "empty" ... but is marked as used
> >by 2.5 TB ...
> 
> That says there's another filesystem inside BACKUP00 which has 2.5TB
> used.
> 
> What are the results of:
> zpool status -v BACKUP00
> zfs list -r BACKUP00
> 

Nothing - drive is still operating on something (as reported), every
zfs related commands make the terminal stuck ...
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