Hi Raj, You can add the OSTs online, we have been doing it but if you are expanding the storage array, you might want to think about what is involved such as cabling etc depends on the recommendation from your storage vendor. We added an expansion on every Dell storage array last year and because of the physical location of these storage, we needed to do a full shutdown. It means we created a maintenance reservation and performed a full filesystem shutdown.
In many occasions when we perform Lustre maintenance, we have suspended jobs but that was when we know the filesystem will stay online, some clients might get evicted during the failover but they will reconnect when jobs were resumed. In your case, if you want to do a full filesystem shutdown, you will have to unmount all the Lustre clients, it means the jobs will need to be killed in order to unmount the filesystem. We always use cat /proc/sys/lnet/peers or lshowmount to make sure that there are no other clients connected before doing the full FS shut down. Hope it helps. -- *Gin Tan* MASSIVE support and consulting services *Monash eResearch Centre* Monash University 15 Innovation Walk Ground Floor, Room G22 Clayton Campus Wellington Road Clayton VIC 3800 Australia T: +61 3 9902 0245 E: [email protected] Z: https://monash.zoom.us/my/gintan www.monash.edu.au/eresearch >
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