[Lustre-discuss] Removing OSTs and OSS

[Deon Borman]

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