[gpfsug-discuss] Cluster ID (mis)match

[Luke Raimbach]

Dear All,

Let's pretend:

I have three GPFS clusters: two storage clusters (just NSD servers) with one file system per storage cluster; and a client cluster (with just compute nodes).

The three clusters all have multi-cluster relationships set up so that all nodes in all clusters can mount the two file systems.

Now imagine that the two storage clusters got accidentally provisioned with the same cluster ID.

What would happen, please?


Special thanks to people who can explain the internal workings of cluster membership lookups for multicluster nodes (I'm interested in the GPFS internals here). For example, where in the GPFS code does the cluster ID make a difference to which cluster manager is contacted?


Cheers GPFSUG once more!
Luke.

Luke Raimbach​
Senior HPC Data and Storage Systems Engineer,
The Francis Crick Institute,
Gibbs Building,
215 Euston Road,
London NW1 2BE.

E: luke.raimbach at crick.ac.uk
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