Red Hat Directory Server 7.1 for HP-UX11i v2 Integrity System Performance Tuning and Sizing Guideline

Red Hat Directory Server 7.1 Performance Tuning and Sizing Guidelines
Step 2: Prime the directory by sending the following ldapsearch command (label it as ldapsearch command 1):
#./ldapsearch –b “<root suffix>” –h <host> -p <port> -D
“cn=directory manager” –w passwd “objectclass=*” > /dev/null
Step 3: check db related monitoring attributes by sending a different ldapsearch request. (label it as ldapsearch
command 2):
# ./ldapsearch -p PORT -b "cn=monitor, cn=ldbm database, cn=plugins,
cn=config" –D "cn=directory manager" -w PASSWD “objectclass=*" |grep dbcache
dbcachehits: 236
dbcachetries: 280
dbcachehitratio: 84
dbcachepagein: 44
dbcachepageout: 0
dbcacheroevict: 0
dbcacherwevict: 0
• Step 4: If dbcachepageout, dbcacheroevict and dbcacherwevict are not equal to zero, you
might want to increase nsslapd-dbcachesize, and repeat from Step 2 until these three attributes
equal to zero or dbcachesize reaches the maximum value or dbcachepagein stops increasing. When
nsslapd-dbcachesize is not big enough, pages need to be discarded
from the dbcache to make room
for new pages. This is indicated by attributes dbcachepageout, dbcacheroevict and
dbcacherwevict. For more information about these attributes, please refer to
and “Red Hat Directory
Server 7.1 Configuration, Command, and File Reference Guide”
To estimate the amount of RAM needed for an optimized database cache, you can use the following formula:
Equation 1: Estimate Size of Database Cache
dbcachesize = SUM(allDB4files)
• Please note: Equation 1 only gives you a very rough estimation for dbcachesize. When estimating database
cache size, only the database (db4) files that your operations need should be included. As an example, if
your directory server only needs to support exact search requests on the “cn” attribute, you may need just
354MB dbcache instead of 685MB dbcache which is the sum of all database (db4) files for the 250K
databases. For more information about how to manage indexes, please refer to “Red Hat Directory Server
7.1 Administrator’s Guide”
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