[lustre-discuss] adding a new OST to live system

[Thomas Roth]

Not a problem at all.

Perhaps if you manage to mount your new OST for the first time just when your MGS/MDT and your network are completely overloaded and almost 
unreactive, then, perhaps, there might be issues ;-)

Afterwards the new OST, being empty, will attract most of the files that are newly created. That could result in an imbalance - old, cold data vs. 
new, hot data. In our case, we migrate some of the old data around, such that the fill level of the OSTs becomes ~equal.

Regards,
Thomas

On 12/1/23 19:18, Lana Deere via lustre-discuss wrote:
> I'm looking at the manual, 14.8, Adding a New OST to a Lustre File
> System, and it looks straightforward.  It isn;'t clear to me, however,
> whether it is OK to do this while the rest of the lustre system is
> live.  Is it OK to add a new OST while the system is in use?  Or do I
> need to arrange downtime for the system to do this?
> 
> Thanks.
> 
> .. Lana (lana.deere at gmail.com)
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