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<strong>ePrism</strong> Overview<br />
HALO (High Availability and Load Optimization)<br />
All systems can be clustered together to increase additional capacity, throughput, or provide load<br />
balancing and optional high availability.<br />
<strong>ePrism</strong> is the first email firewall to provide enterprises with a carrier-grade failsafe clustering<br />
architecture for high availability. HALO ensures email is never lost due to individual system failure<br />
through its unique security, cluster management, load balancing and optimization, and "stateful<br />
failover" queue replication capabilities.<br />
Cluster Management<br />
The cluster management feature allows administrators to manage <strong>ePrism</strong> clusters and to<br />
synchronize configuration settings across all systems in the cluster. Combined reports and email<br />
database searches may be derived from clustered systems. Specific features include:<br />
• Configuration Cloning — This function allows systems to be added to clusters and to assume<br />
the configuration of a defined "master" Cluster Console system.<br />
• Cluster Synchronization — Systems within a cluster can be synchronized to the defined<br />
"master" system. Any changes to the configuration of the Cluster Console master are reflected<br />
in the configuration of all systems in the cluster.<br />
• Cluster Reporting — <strong>ePrism</strong> reports can be generated for a single system or for all systems in<br />
a cluster. The email database can be searched by system or by cluster. The history and status of<br />
any message can be instantly retrieved regardless of which system processed the message.<br />
Load Balancing and Optimization<br />
A basic requirement of high availability is to have an automated or semi-automated mechanism for<br />
switching the mail stream between available systems in the cluster, depending on their individual<br />
availability or health.<br />
Utilizing DNS round-robin techniques, or dedicated load balancing hardware, email can be directed<br />
to <strong>ePrism</strong> systems in a cluster depending on their availability and current load.<br />
Queue Replication<br />
To prevent the loss of email messages during a system failure, <strong>ePrism</strong> has created a unique solution<br />
to this problem with "stateful failover" queue replication technology that replicates queues and<br />
intelligently synchronizes messages to a defined mirror system within a cluster. If a system in a<br />
cluster should fail, and there exists undelivered mail in its queue, a mirror system can take<br />
ownership of that queue’s messages and successfully process and deliver them.<br />
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