> My current settings are:
>
> mds advanced mds_beacon_grace 15.000000
True. I might as well remove it completely, it's an artefact of earlier
experiments.
> 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.
>