LDAP-UX Client Services B.04.10 Administrator's Guide (edition 7)

NOTE: The ldapclientd -f command will flush all caches. Refer to the man page
ldapclientd (1M) for more information.
It is possible to alter the caching lifetime values for each service listed above, in the
/etc/opt/ldapux/ldapclientd.conf file. See below for additional information. It is also possible to
enable or disable a cache using the -E or -D (respectively) options. These options may be useful
in determining the effectiveness of caching or helpful in debugging.
ldapclientd Persistent Connections
Since the HP-UX can generate many requests to an LDAP server, the overhead of establishing a
single connection for every request can create excessive network traffic and slow response time
for name service requests. Depending on network latency, the connection establishment and
tear-down can cause relatively severe delays for client response. However, a persistent connection
to the directory server will eliminate this delay.
In the ldapclientd daemon, a pool of active connections is maintained to serve requests from the
Name Service Subsystem (NSS). If the NSS needs to perform a request to the directory server,
one of the free connections in this pool will be used. If there are no free connections in the pool,
a new connection will be established, and added to the pool. If system activity is low, then
connections that have been idle for a specified period of time (configurable in the ldapclientd.conf
file) then those connections will be dropped, to free up directory server resources. Aside from
ldapclientd connection time-out configuration, it is also possible to define a maximum number
of connections that ldapclientd may establish. Setting a high number of connections means assures
that ldapclientd will not become a bottleneck in performing name service operations to the
directory server. However, a high number of connections from a large number of HP-UX clients
to the same directory server may exhaust all available connection resources on that directory
server. Setting a low number of maximum connections will reduce that resource requirement
on the directory server, but may create a performance bottleneck in the ldapclientd.
122 Administering LDAP-UX Client Services