[Lustre-discuss] Removing OSTs and OSS

[Andreas Dilger]

Once the OSTs are deactivated you should mount them as ldiskfs and copy  out the last_rcvd, O/0/LAST_ID, and CONFIGS/mountdata files for safe keeping for when you want to add new OSTs. You can live without them, but it is easier to have them. 


Cheers, Andreas

On 2011-09-05, at 10:21 AM, Deon Borman <deon at blackginger.tv> wrote:

> Hi,
> 
> I have some ageing hardware I'd like to remove. This includes the OSS 
> and the OSTs connected to it.
> 
> So, as far as I understand, I need to deactivate the OSTs on the MDS 
> with `lctl --device <devno> deactivate`, copy out all the objects from 
> the deactivated OST with lfs_migrate and finally, permanently deactivate 
> the OSTs on all the clients and MDS with `lctl conf_param <OST 
> name>.osc.active=0`. Am I missing something, or is that it?
> 
> Now for my real question: Once everything copied out, I'd like to 
> permanently switch off and re-purpose the hardware. Do I need to do 
> anything else, other than unmounting the OSTs and shutting down the OSS? 
> As far as I can tell, the MDS still knows about the this OSS and OSTs, 
> but will not try to use it. So will the removed OSS cause possible 
> issues in future? If so, how do I fix it. With a --writeconf on MDS/OSS?
> 
> All this will happen on a Lustre 1.8.5 system.
> 
> Thanks in advance,
> Deon
> 
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