> * The default memory utilization for the mons has been increased
> somewhat. Rocksdb now uses 512 MB of RAM by default, which should
> be sufficient for small to medium-sized clusters; large clusters
> should tune this up. Also, the `mon_osd_cache_size` has been
> increase from 10 OSDMaps to 500, which will translate to an
> additional 500 MB to 1 GB of RAM for large clusters, and much less
> for small clusters.
Just I don't perseverate on this: mon_osd_cache_size is a [mon] setting for
ceph-mon only? Does it relate to osd_map_cache_size? ISTR that in the past
the latter defaulted to 500; I had seen a presentation (I think from Dan) at an
OpenStack Summit advising its decrease and it defaults to 50 now.
I like to be very clear about where additional memory is needed, especially for
dense systems.
-- Anthony
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