Unlike the server tiers for application and device management for Unwired Server and Afaria nodes, the data tier can be clustered to make system data used by the server tier more fail-safe.
When creating a database cluster, administrators must use Microsoft Cluster Server to ensure data fails over and thereby enhances data reliability by ensuring that does not have a single point of failure. Microsoft Cluster Server allows Unwired Platform to fail over the data tier when the current server fails. Both servers (active/failed and passive/takeover) must have a connection to the storage subsystem.
The consolidated database data, along with the Advantage messaging database data, should be stored on a redundant array of independent disks (RAID) cluster. You can use any number of disks in a redundant array. However, the more disks you have in the array, the more fail-safe it is; performance degrades with the more disks you introduce. Sybase recommends that you use a RAID 1 disk array for deployments that require a high degree of fault tolerance and performance from their Unwired Platform data tier.