Service manual

Using Available System Resources
154 Sun ONE Directory Server Installation and Tuning Guide • June 2003
nsslapd-reservedescriptors Sets the number of file descriptors Directory Server maintains to
manageindexing, replication andotherinternalprocessing. Directory
Server does not use such file descriptors to handle client connections.
Consider increasing thevalue of thisattribute from the default of 64 if
all of the following are true.
• Directory Server replicates to more than 10 consumers or
Directory Server maintains more than 30 index files.
• Directory Server handles a large number of client connections.
• Messages in the error log suggest Directory Server is running out
of file descriptors for operations not related to client connections.
Notice that as the number of reserved file descriptors increases, the
number of file descriptors available to handle client connections
decreases. If you increase the value of this attribute, consider
increasing the number of file descriptors available on the system, and
increasing the value of nsslapd-maxdescriptors.
Ifyoudecide tochange thisattribute,fora first estimate ofthenumber
of file descriptors to reserve, try setting the value of
nsslapd-reservedescriptors to:
20+4*(numberofdatabases)+(totalnumberof
indexes) + (value of nsoperationconnectionslimit) *
(number of chaining backends) + ReplDescriptors +
PTADescriptors + SSLDescriptors
Where ReplDescriptors = number of supplier replica + 8 if replicationis
used, PTADescriptors is 3 if the Pass Through Authentication (PTA)
plug-in is enabled (0 otherwise), and SSLDescriptors is 5 if SSL is used
(0 otherwise).
The number of databases is the same as the number ofsuffixes for the
instance, unless the instance is configured to use more than one
database per suffix. Verify estimates through empirical testing.
nsslapd-securelistenhost Sets the hostname for the IP interface on which Directory Server
listens for SSL connections. This attribute is single-valued.
Defaultbehavior isto listen on all interfaces. Consider this attribute in
the same way as nsslapd-listenhost.
Table 9-2 Tuning Recommendations for Configuring Use of System Resources (Continued)
Attribute (on dn: cn=config) Short Description and Tuning Recommendations