When allocating cluster resources to support a highly-available installation, consider the following requirements:
Each cluster node that hosts the Sentinel services must meet the requirements specified in Section 5.0, Meeting System Requirements.
Ensure that sufficient shared storage is available for the Sentinel data and application.
A virtual IP address for the services that can be migrated from node to node on failover.
The Sentinel installer (TAR file) with a valid license.
The SUSE Linux High Availability Extension (ISO image) with a valid license.
A shared storage device that meets the performance and size characteristics as documented in Section 5.0, Meeting System Requirements. The exemplary solution will use a standard SUSE Linux VM configured with iSCSI Targets as shared storage.
Minimum two cluster nodes that meet the resource requirements for running Sentinel in the customer environment. The exemplary solution will use two SUSE Linux VMs.
A method for the cluster nodes to communicate with the shared storage, such as FibreChannel for a SAN. The exemplary solution will use a dedicated IP address to connect to the iSCSI Target.
A virtual IP that can be migrated from cluster node to cluster node to serve as the external IP address for Sentinel.
At least one IP address per cluster node for internal cluster communications. The exemplary solution will use a simple unicast IP address, but multicast is preferred for production environments.