Re: Provide more documentation for MDS performance tuning on large file systems

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On Tue, Dec 15, 2020 at 12:50 AM Janek Bevendorff
<janek.bevendorff@xxxxxxxxxxxxx> wrote:
>
> My current settings are:
>
> mds           advanced  mds_beacon_grace 15.000000

This should be a global setting. It is used by the mons and mdss.

> mds           basic     mds_cache_memory_limit 4294967296
> mds           advanced  mds_cache_trim_threshold 393216
> global        advanced  mds_export_ephemeral_distributed true
> mds           advanced  mds_recall_global_max_decay_threshold 393216
> mds           advanced  mds_recall_max_caps 30000
> mds           advanced  mds_recall_max_decay_threshold 98304
> mds           advanced  mds_recall_warning_threshold 196608
> global        advanced  mon_compact_on_start true
>
> I haven't had any noticeable slow downs or crashes in a while with 3
> active MDS and 3 hot standbys.

Thanks for sharing the settings that worked for you.

-- 
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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