zfs discuss - Sep 2008 - How to remove any references to a zpool that''s gone

I had a disk that contained a zpool.  For reasons that we won''t go in
to, that disk had zero''s written all over it (at least enough to cover
the entirety of the zpool space).  Now when I run zpool status the
command hangs when it tries to display information about the now
non-existent pool.  Similarly, trying to destroy the pool hangs as well.

Is there some way to remove the pool from zfs''s pool of knowledge?
Also, is it a bug that the failure mode for this situation isn''t more
graceful?  Surely zfs should figure out that ''something really bad
happened'' and give up the ghost gracefully?

Thanks!

-- 
Glenn

Hi Glenn,

Where is it hanging?  Could you provide a stack trace?  It''s possible  
that it''s just a bug and not a configuration issue.

On 18 Sep, 2008, at 16.12, Glenn Lagasse wrote:
> I had a disk that contained a zpool.  For reasons that we won''t go
in
> to, that disk had zero''s written all over it (at least enough to
cover
> the entirety of the zpool space).  Now when I run zpool status the
> command hangs when it tries to display information about the now
> non-existent pool.  Similarly, trying to destroy the pool hangs as  
> well.
>
> Is there some way to remove the pool from zfs''s pool of knowledge?
> Also, is it a bug that the failure mode for this situation isn''t
more
> graceful?  Surely zfs should figure out that ''something really bad
> happened'' and give up the ghost gracefully?
>
> Thanks!
>
> -- 
> Glenn
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss



Regards,
markm


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Hey Mark,

* Mark J Musante (Mark.Musante at Sun.COM) wrote:
> Hi Glenn,
>
> Where is it hanging?  Could you provide a stack trace?  It''s
possible
> that it''s just a bug and not a configuration issue.
I''ll have to recreate the situation (won''t be able to do so
until next
week).  I had a zpool status (and subsequently a zpool destroy) command
that was hung, subsequent zfs commands also would hang.  I couldn''t
even
do a zpool export (which someone privately told me should work).  What
worked was to reboot (which I actually had to power the machine off
physically, init and reboot did nothing) and then I could export the
''broken'' pool.  So I''m not sure where the bug is, but
this shouldn''t be
too hard to replicate and I believe running zpool status with this type
of setup will cause a hang and then you''re stuck until you power off
the
machine and reboot to do the export.  I''ll report back next week once I
replicate this.

Thanks,

Glenn

Glenn Lagasse wrote:
> Hey Mark,
>
> * Mark J Musante (Mark.Musante at Sun.COM) wrote:
>   
>> Hi Glenn,
>>
>> Where is it hanging?  Could you provide a stack trace?  It''s
possible
>> that it''s just a bug and not a configuration issue.
>>     
>
> I''ll have to recreate the situation (won''t be able to do
so until next
> week).  I had a zpool status (and subsequently a zpool destroy) command
> that was hung, subsequent zfs commands also would hang.  I
couldn''t even
> do a zpool export (which someone privately told me should work).  What
> worked was to reboot (which I actually had to power the machine off
> physically, init and reboot did nothing) and then I could export the
> ''broken'' pool.  So I''m not sure where the bug
is, but this shouldn''t be
> too hard to replicate and I believe running zpool status with this type
> of setup will cause a hang and then you''re stuck until you power
off the
> machine and reboot to do the export.  I''ll report back next week
once I
> replicate this.
>   
Probably a bug like:
http://bugs.opensolaris.org/view_bug.do?bug_id=6667208
Your workaround works.
 -- richard