The data tier can be clustered to make system data used by the server tier more fail-safe.
When creating a cluster for the data tier, administrators must use Microsoft Cluster Service (or Failover Cluster) to ensure data fails over and thereby enhances data reliability by ensuring that does not have a single point of failure. Microsoft Cluster Service (or Failover Cluster) 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.