[Lustre-discuss] Permanently removing an OST

[Kevin Van Maren]

Andreas,

This isn't the same as the similar thread, where an OST is being  
replaced (keeping the same number).  Doesn't he just have to re-do the  
writeconf, to delete references to the OST in the MGS, as in Bug 22283?

There will remain a gap in the OST numbers, but that should be okay if  
there are no objects, right?

Kevin


On May 26, 2010, at 6:22 PM, Florent Parent <florent.parent at clumeq.ca>  
wrote:

> On Wed, May 26, 2010 at 19:08, Andreas Dilger <andreas.dilger at oracle.com 
> > wrote:
>> On 2010-05-26, at 16:49, Florent Parent wrote:
>>>
>>> on MGS:
>>> lctl conf_param osc.lustre1-OST002f-osc.active.osc.active=0
>>
>> If you specified the above, it is possible that you only  
>> deactivated it on the MDS, not on the clients as well.
>
> Right. It was executed on all clients as well.
>
>>
>>> Many days later, and even following a complete server/clients  
>>> reboot,
>>> we are now seeing this target being active on clients:
>>>
>>> on MDT:
>>> [root at mds2 ~]# lctl get_param osc.lustre1-OST002f-osc.active
>>> osc.lustre1-OST002f-osc.active=0
>>> [root at mds2 ~]# lctl dl|grep 002f
>>> 51 UP osc lustre1-OST002f-osc lustre1-mdtlov_UUID 5
>>
>> The device is configured, but if it is not active it will not be  
>> used for anything.
>>
>>> on client:
>>> # ssh r101-n33 lctl dl |grep 002f
>>> 50 UP osc lustre1-OST002f-osc-ffff810377354000
>>> ef3f455a-7f67-134e-cf38-bcc0d9b89f26 4
>>
>> What does "active" report for this OSC on a client?
>
> Shows 0 (I don't know why we are seeing a double entry here). So I
> guess it's inactive. I was under the impression references to the OST
> would go away. It's also confusing to have the OST show as UP in "lctl
> dl".
>
> # ssh r101-n33 lctl get_param osc.lustre1-OST002f-osc*.active
> osc.lustre1-OST002f-osc-ffff810371ac3c00.active=0
> osc.lustre1-OST002f-osc-ffff810377354000.active=0
>
> Thanks
> Florent
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