zpool import hangs when out of space - Was: zfs pool import hangs on [tx->tx_sync_done_cv]

[Steven Hartland]

----- Original Message ----- 
From: "Mark Martinec" <Mark.Martinec+freebsd at ijs.si>


> On 10/14/2014 13:19, Steven Hartland wrote:
>> Well interesting issue I left this pool alone this morning literally doing
>> nothing, and its now out of space.
>> zpool list
>> NAME       SIZE  ALLOC   FREE   FRAG  EXPANDSZ    CAP  DEDUP  HEALTH
>> ALTROOT
>> sys1boot  3.97G  3.97G   190K     0%         -    99%  1.00x  ONLINE  -
>> sys1copy  3.97G  3.97G     8K     0%         -    99%  1.00x  ONLINE  -
>>
>> There's something very wrong here as nothing has been accessing the pool.
>>
>>   pool: zfs
>> state: ONLINE
>> status: One or more devices are faulted in response to IO failures.
>> action: Make sure the affected devices are connected, then run 'zpool
>> clear'.
>>    see: http://illumos.org/msg/ZFS-8000-HC
>>   scan: none requested
>> config:
>>
>>         NAME        STATE     READ WRITE CKSUM
>>         zfs         ONLINE       0     2     0
>>           md1       ONLINE       0     0     0
>>
>> I tried destroying the pool and ever that failed, presumably because
>> the pool has suspended IO.
> 
> That's exactly how trouble started here. Got the
>   "One or more devices are faulted in response to IO failures"
> on all three small cloned boot pools one day, out of the blue.
> There was no activity there, except for periodic snapshoting
> every 10 minutes.

Yer this isn't fragmentation, this is something else. I've started a
thread on the openzfs list to discuss this as theres something quite
odd going on.

    Regards
    Steve