Use these guidelines to determine if your site should configure the LDAP data cache:
If Calendar Server at your site accesses your master (or root) LDAP directory server directly with no delays in the availability of committed LDAP data, you don t need to configure the LDAP data cache. Make sure that the local.ldap.cache.enable parameter is set to "no" (which is the default).
If you have deployed a Master/Slave LDAP Configuration, where Calendar Server accesses the master LDAP directory through a slave LDAP directory server, there will be a delay in the availability of committed LDAP data. Configure the LDAP data cache to ensure that your end users have the most recent data.