Internal storage
Internal storage is directly attached to the system. The system can manage a combination of internal and external storage and represents all the detected storage as MDisks.
For SAN Volume Controller 2145-CG8 or 2145-CF8 nodes, one or more pairs of nodes can contain 0 - 4 drives per node. SAN Volume Controller 2145-SV1 and SAN Volume Controller 2145-DH8 nodes support two chains that each contain 10 expansion enclosures. Each I/O group can contain up to 20 expansion enclosures. Each expansion enclosure is attached to each node in the I/O group. Drives are installed in the drive slots in the front of the node or enclosure. Redundancy and high availability of data is provided through volume mirroring and different array configurations.
The system automatically detects the attached drives, determines the available drive classes, and recommends array configurations. These arrays are presented as MDisks, which can be added to pools in the same way as MDisks that are discovered on external storage systems are added. If the MDisks are created from different tiers of storage, Easy Tier® can be used to automatically manage the migration of highly used data to faster drives.