[gpfsug-discuss] CES services on an existing GPFS cluster

[Sander Kuusemets]

Hello,

I have been thinking about setting up a CES cluster on my GPFS custer 
for easier data distribution. The cluster is quite an old one - since 
3.4, but we have been doing rolling upgrades on it. 4.2.0 now, ~200 
nodes Centos 7, Infiniband interconnected.

The problem is this little line in Spectrum Scale documentation:

> The CES shared root directory cannot be changed when the cluster is up 
> and running. If you want to modify the shared root configuration, you 
> must bring the entire cluster down.

Does this mean that even the first time I'm setting CES up, I have to 
pull down the whole cluster? I would understand this level of service 
disruption when I already had set the directory before and now I was 
changing it, but on an initial setup it's quite an inconvenience. Maybe 
there's a less painful way for this?

Best regards,

-- 
Sander Kuusemets
University of Tartu, High Performance Computing

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