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How to set up multiple CEs at one site

There are several possible reasons for setting up multiple CEs at one site:

  • load sharing + failover redundancy
  • very different hardware on different clusters
  • resources located on separate networks
  • multiple batch systems in use
  • trying out a new version or implementation on a test machine

With YAIM one would typically give each CE its own site-info.def with definitions that are appropriate for the batch resources behind the CE.

Here it is important to prevent double counting of your CPUs in GStat: for a set of equivalent CEs (sharing the same batch resources) only one should publish the true values for GlueSubClusterPhysicalCPUs, while the others should publish zero. The corresponding YAIM variable is CE_PHYSCPU.