Hello,
we have a two node NSD cluster based on a DDN system. Currently we
run Spectrum Scale 5.0.4.1 in an HPC environment.
Mmhealth shows a tip stating "gpfs_maxstatcache_low". Our current settings are:
# mmdiag --config | grep -i cache
! maxFilesToCache 3000000
maxStatCache 10000
maxFilesToCache was tuned during installion and maxStatCache is the
according default value.
After discussing this issue on the german spectumscale meeting, I
understand that it is difficult to give a formula on howto calulate
this values.
But I learnt that a FilesToCache entry costs about 10 kbytes of memory
and a StatCache entry about 500 bytes. And typically maxStatCache
should (obviously) be greater than maxFilesToCache. There is a average
100 GB memory usage on our systems (with a total of 265 GB RAM).
So setting maxStatCache to at least 3000000 should be no problem. But
is that correct or to high/low?
Has anyone some hints or thoughts on this topic? Help is welcome.
Regards,
Philipp
--
Philipp Grau | Freie Universitaet Berlin
[email protected] | Zentraleinrichtung fuer Datenverarbeitung
Tel: +49 (30) 838 56583 | Fabeckstr. 32
Fax: +49 (30) 838 56721 | 14195 Berlin
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