The CLD plug-in supports the following Calendar Server configurations:
In all configurations, each front-end and back-end server must:
Be on the same hardware platform.
Be running the same operating system.
Be running the same Calendar Server release, including patches.
Use the same port number for the DWP port (service.dwp.port parameter). The default port number is “59779”.
Figure 6–1 shows two front-end servers and two back-end servers running a single Calendar Server instance. You can also configure more than two front-end or back-end servers, if you wish.
This configuration allows the servers to be protected by a firewall to restrict access to the LDAP and calendar databases. The calendar database is distributed across the two back-end servers.
The front-end servers are CPU intensive, with most CPU time spent rendering calendar data for end-users. The back-end servers are disk intensive, with most CPU time spent accessing the calendar database.
For configuration instructions, see Configuring Calendar Servers for CLD and DWP.
Figure 6–2 shows three machines functioning as both front-end and back-end servers. Each machine is connected to a calendar database. This configuration allows calendars to be geographically distributed. Calendar owners (end users) log into the machine where their calendars reside. For configuration instructions, see To Configure a Server as Both a Front-end and a Back-end.