Hi Paul,
On 7/16/19 9:16 AM, Paul Whitney wrote:
Is there some formula or recommendation on determining what
would be the optimal cache settings for a directory server
(389-ds of course) with following sizes? I looked at the DS 10
Admin Guide online and am getting conflicting information. But
the manual shows a table and suggests that the max size for the
cn=config dbcache is 512MB.
There is no limit on the cache size value besides what you are
limited to by a unsigned long integer. Do you have a link to where
it says 512 MB is a maximum?
But I tried with 5GB
and it appears to work fine with it, although over time start to
see negative values (prob not enough cache) and roevicts while
running the dbmon.sh script.
__db files = ~6GB
groupRoot = 1.5GB
userRoot = 20GB
What values would yield best performance for:
cn=config dbcache? currently set to 5GB but are still seeing
lots of roevicts. As much
userRoot entry cache? currently set to 21GB (hit ratio so far at
95%)
groupRoot entry cache? currently set to 2GB (hit ration so far
at 96%)
Virtual machine configured with 8CPU, 128GB RAM. Load is in the
low 20's with occasional spikes to high 20's.
If you have 128 GB available to you then I would continue to
increase the cache sizes until you get to 99% hit ratio for the
two entry caches, and the db cache. Also make sure the DN and NDN
caches also have a 99% cache hit ratio:
https://access.redhat.com/documentation/en-us/red_hat_directory_server/10/html/performance_tuning_guide/tuning-dn-cache
https://www.port389.org/docs/389ds/design/normalized-dn-cache.html
I would also look into running the DB on a RAM disk since you
have the resources to do so:
https://access.redhat.com/documentation/en-us/red_hat_directory_server/10/html/performance_tuning_guide/tuning-db-cache#db-cache-on-ram-disk
HTH,
Mark
Paul
M. Whitney, RHCSA, CISSP
Chesapeake IT Consulting, Inc.
2680 Tobacco Rd
Chesapeake Beach, MD 20732
Work: 443-492-2872
Cell: 410.493.9448
Email: paul.whitney@xxxxxxxxxxxxxxxxx
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