[Lustre-discuss] cleaning up on lustre

[Sheila Barthel]

See Section 4.2.3.1 Removing an OST:

http://manual.lustre.org/manual/LustreManual16_HTML/LustreInstallation.html#50446385_pgfId-1286363

Kalpak Shah wrote:
> On Tue, 2008-07-08 at 07:01 -0400, Mag Gam wrote:
>   
>> We have just implemented lustre at my university and we are trying to
>> get used to some concepts. We have recreated the environment
>> manytimes, but I would like to understand how to do some things. The
>> wiki or the operations manual does not have these directions clearly
>> spelled out.
>>     
>
> This is described in the Lustre 1.6 manual under "Removing an OST". I
> don't remember the section.
>
>   
>> For example, I would like to know what is the correct way to remove
>> remove (OST). The OSTs reside on a Linux LVM. I guess I can do,
>> "unmount on all lustre clients" , on the MDS run "lctl dl" and then
>> "lctl --device OSC_UID deactivate" and then removelv?
>>     
>
> Doing a "lctl --device OSC_UUID deactivate" on the MDS will only stop
> new objects from being allocated on that OST. To completely remove the
> OST you need to use "lctl conf_param lustre-OST0000.osc.active=0". If
> later you want to use this OST again you can set the "active" parameter
> to 1. Or if you wish you can remove this OST permanently. Don't try to
> use the same OST index as the old OST, since this will confuse the MDT.
>
> Before removing the OST you should copy all the files which have objects
> on that OST. You can find such files using "lfs find --recursive --obd
> <OST_UUID> /mnt/lustre"
>
> Thanks,
> Kalpak
>
>   
>> Does that sound ok?
>>
>> Any ideas?
>>
>> TIA
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>>     
>
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