On 11/16/2012 09:03 AM, Russell Beall wrote:
Our production servers (three
replicants) are equipped with 128GB. We started maxing out the
64G chips that used to be in there and had to upgrade. This is
for a similarly sized id2entry file, however, the memory we use
primarily is not for database cache but is for the entry cache.
This memory size applies to Sun Directory Server 6.3. We are
transitioning to 389, and 389 uses about half the memory
required for the entry cache, so we probably can get by with 64G
for those nodes, but with Linux, we have been experiencing the
memory fragmentation problem which grows the memory requirements
significantly when lots of modifies are done. For this reason,
we are also going with 128G for that environment.
Ultimately, you will need to test for performance, but
definitely test with larger memory sizes and larger cache sizes
to verify what speed improvements you might get. Speed can be
very seriously impacted when the cache is not tuned well and
doesn't have enough space for decent response time.
You will also need to monitor dbcache and entry cache usage, to make
sure your settings are applicable. See
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Directory_Server/9.0/html/Administration_Guide/Monitoring_Server_and_Database_Activity-Monitoring_Database_Activity.html
Regards,
Russ.
==============================
Russell Beall
Programmer Analyst IV
Enterprise Identity Management
University of Southern California
==============================
Hello,
First off, my server
is equipped with 12GB of physical memory. From reading
tuning guides online, I’ve found that a starting
estimate for the ‘dbcachesize’ = SUM(allDB4files). For
one of my directory instances, the id2entry.db4 file
alone is ~ 11GB.
Performance wise,
would it be worthwhile to increase the amount of
physical memory on the server (perhaps 64-128GB)? Or
does 11GB for an id2entry seem like an extremely high
value that’s out of the operating capabilities of the
directory? Is it unheard of for a production directory
server to be equipped with 64GB of physical memory?
Thanks,
pwr
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