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Happy Friday! In progress to add pool accounts for some new VOs to support, it turns out on examination that pool account UIDs & GIDs differ pretty significantly from CE to WN & that diff WN have diff pool accounts mapped to same UID. Eg it turns out what are cmspil accounts on WN are a mix of cmspil & ngs (!) pool accounts on other WN, & are all ngs (!) pool accounts on Bristol's only CE. But the site isn't "broken" - seems fine (I think!) (touch wood!) Either what UID/GID a pool account has really must not matter at all - Is that true? After all, the gridmapdir which is NFS-mounted to all nodes from ARGUS uses only pool account name - not UID. I think it is true but seek confirm. Or, it does matter & it's just chance that the UID inconsistency across nodes hasn't bitten Bristol yet. I've looked in my email archives & find mail from 2009 or so saying things like "These are the UID/GIDs that should be used across all nodes at our site" and "> So all those pool accounts must remain the same UID/GIDs, is that > right? Yes, that's important." Grateful for advice! (even moreso for WLCG documentation about this? Is there any?)