As part of your disaster recovery procedures, you must back up the CCS components and data. In addition, when you restore from a backup, you must restore and reactivate components in a specified sequence. In addition, you should have a prepared disaster recovery plan in place before a disaster occurs.
The severity of the effect of a component failure varies. In addition, the effect varies depending on how you have deployed CCS.
The entire CCS temporarily fails to operate if any of the following fail:
All CCS Manager Load Balancers
Failures of one or more CCS Manager instances can often be worked around automatically by CCS. All CCS Manager instances have a form of load logic built in. If two or more CCS Manager instances are configured identically, the system uses the CCS Manager instances in a round-robin fashion to balance the loads. That is, with two CCS Manager Load Balancers, the Application Server alternately sends jobs to each load balancer. If a site includes two or more identically configured CCS Manager collectors, the load balancers send jobs to the collectors on a round-robin basis.
This behavior is not true load balancing. In true load balancing, the load balancer polls the CCS Manager Collectors before the transmission of the job. The load balancer evaluates the CCS Manager Collector loads and sends the job to the computer that is most eligible to handle a new task. In the round-robin scheme, jobs are transmitted to the next CCS Manager in sequence, regardless of its current workload.
Since the CCS Manager handles jobs in this fashion, limited fault tolerance is present. A failed CCS Manager in any role is removed from this rotation and is skipped when jobs are assigned.
If the CCS Web Console server fails, the Web console is unavailable until the Web Console server is restored. Since same computer hosts both the Web Console server and the Application Server, the same failures affect both servers.
If the CCS Console fails on a computer, the console is unavailable on that computer until the console software is reinstalled. The console is still usable on all other computers where it is installed.
Imported Document ID: HOWTO76443
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