The Full Rack version of Oracle SuperCluster T5-8 contains eight Exadata Storage Servers. The Half Rack version of Oracle SuperCluster T5-8 contains four Exadata Storage Servers. Redundancy in the Exadata Storage Servers is achieved two ways:
Through connections between the Exadata Storage Servers. For more information, see Understanding the Exadata Storage Server Physical Connections.
Through components within the Exadata Storage Servers:
Power supplies – Each Exadata Storage Server contains two power supplies. The Exadata Storage Server can continue to operate normally if one of the power supplies fail, or if one of the power distribution units fail.
Disk drives – Each Exadata Storage Server contains 12 disk drives, where you can choose between disk drives designed for either high capacity or high performance when you first order Oracle SuperCluster T5-8. Oracle SuperCluster T5-8 software provides redundancy between the 12 disk drives within each Exadata Storage Server. For more information, see Cluster Software for the Database Domain.