looking for some insight into configuring FDS for an enterprise environment of 10k users

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I have been doing some stress tests on the FDS in order to try and
configure the server for an enterprise wide deployment.  My goal is to
recommend the number of slave/master servers and the appropriate
configuration for an environment with 10k users.
 
Starting with a default FDS installation I have modified the directory
accordingly:
10k users id's
the max cache size: 63Mb
Lookthrough limit:  15000
Max file descriptors: 4096
memory avail. for cache: 100Mb
Created an index for uidnumber
 
I have created a php script to stress test the server.
The script has the following parameters:
 
processes 500      # number of simultaneous connections
binds 5                 #number of times the script will loop
query 50               # number of queries to make
min sleep 1           # min time between queries
max sleep 5          # max time between queries
uid_number 50000 # search for this uidnumber
server 10.27.1.104 #host ldap server
 
Running this script will generate "can't contact the LDAP server"
errors.  My question is should I be looking at some other parameters to
modify in order to have the server handle more simultaneous connections.
500 connections doesn't seem like an unreasonable number of connections
for an enterprise directory server, yet the server is rolling over at
what seems to be a pretty light load...
 
Any insights on how best to configure the server to handle a larger
number of connections would be greatly appreciated.
 
Thanks
 
 
 
 
 

Cary Anderson, Systems Software Specialist
UNIX/Linux Services

Information Technology Services Branch
Technology Services & Support Division / Data Center Section

System Software & Storage Infrastructure
fCalPERS

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