Each Oracle SuperCluster T5-8 contains one ZFS storage appliance, in either the Full Rack or Half Rack version. The ZFS storage appliance consists of the following:
Two ZFS storage controllers
One Sun Disk Shelf
Redundancy in the ZFS storage appliance is achieved two ways:
Through connections from the two ZFS storage controllers to the Sun Disk Shelf. For more information, see Understanding the ZFS Storage Appliance Physical Connections.
Through components within the ZFS storage appliance itself:
Power supplies – Each ZFS storage controller and Sun Disk Shelf contains two power supplies. Each ZFS storage controller and the Sun Disk Shelf can continue to operate normally if one of those power supplies fails.
Disk drives – Each ZFS storage controller contains two mirrored boot drives, so the controller can still boot up and operate normally if one boot drive fails. The Sun Disk Shelf contains 20 hard disk drives that are used for storage in Oracle SuperCluster T5-8, and 4 solid-state drives that are used as write-optimized cache devices, also known as logzillas. Oracle SuperCluster T5-8 software provides redundancy between the disk drives. For more information, see Understanding the Software Configurations.