[gpfsug-discuss] AFM negative file caching

[Simon Thompson (IT Research Support)]

Hi All,

We have a file-set which is an AFM fileset and contains installed software.

We’ve been experiencing some performance issues with workloads when this is running and think this is down to LD_LIBRARY_PATH being set to the software installed in the AFM cache, e.g.

/gpfs/apps/somesoftware/v1.2/lib

Subsequently when you run (e.g.) “who” on the system, LD_LIBRARY_PATH is being searched for e.g. libnss_ldap, which is in /usr/lib64. We’re assuming that AFM is checking with home each time the directory is processed (and other sub directories like lib/tls) and that each time AFM is checking for the file’s existence at home. Is there a way to change the negative cache at all on AFM for this one file-set? (e.g as you might with NFS). The file-set only has applications so changes are pretty rare and so a 10 min or so check would be fine with me.

Thanks

Simon

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