David W. Smith wrote:
> On Thu, 2009-01-08 at 13:26 -0500, Brian H. Nelson wrote:
>   
>> David Smith wrote:
>>     
>>> I was wondering if anyone has any experience with how long a "zfs destroy" 
>>> of about 40 TB should take?  So far, it has been about an hour...  Is there 
>>> any good way to tell if it is working or if it is hung?
>>>
>>> Doing a "zfs list" just hangs.  If you do a more specific zfs list, then it 
>>> is okay... zfs list pool/another-fs
>>>
>>> Thanks,
>>>
>>> David
>>>   
>>>       
>> I can't voice to something like 40 TB, but I can share a related story 
>> (on Solaris 10u5).
>>
>> A couple days ago, I tried to zfs destroy a clone of a snapshot of a 191 
>> GB zvol. It didn't complete right away, but the machine appeared to 
>> continue working on it, so I decided to let it go overnight (it was near 
>> the end of the day). Well, by about 4:00 am the next day, the machine 
>> had completely ran out of memory and hung. When I came in, I forced a 
>> sync from prom to get it back up. While it was booting, it stopped 
>> during (I think) the zfs initialization part, where it ran the disks for 
>> about 10 minutes before continuing. When the machine was back up, 
>> everything appeared to be ok. The clone was still there, although usage 
>> had changed to zero.
>>
>> I ended up patching the machine up to the latest u6 kernel + zfs patch 
>> (138888-01 + 139579-01). After that, the zfs destroy went off without a 
>> hitch.
>>
>> I turned up bug 6606810 'zfs destroy <volume> is taking hours to 
>> complete' which is supposed to be fixed by 139579-01. I don't know if 
>> that was the cause of my issue or not. I've got a 2GB kernel dump if 
>> anyone is interested in looking.
>>
>> -Brian
>>
>>     
>
> Brian,
>
> Thanks for the reply.  I'll take a look at the 139579-01 patch.  Perhaps
> as well a Sun engineer will comment about this issue being fixed with
> patches, etc.
>   

My pleasure :-).  6606810 was closed as a dup of 6573681 which was
fixed in NV 94 and patch 139579-01.
http://bugs.opensolaris.org/view_bug.do?bug_id=6606810
http://bugs.opensolaris.org/view_bug.do?bug_id=6573681
http://sunsolve.sun.com/search/document.do?assetkey=1-21-139579-01-1
 -- richard

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