Control
enclosures contain the node canisters that manage the system operation
and provide the host interfaces. Expansion
enclosures provide more extra drives that can be managed by the system. Enclosures
can support 2.5 inch (6.35 cm) small form factor drives or 3.5 inch
(8.89 cm) large form factor drives.
You must be able to distinguish between control enclosures and
expansion enclosures before you service the system. Be aware of the following differences:
- The model type that is shown on the labels.
- The model description that is shown on the left end cap.
- The number of ports at the rear of the enclosure. Control enclosures
have Ethernet ports, space for host interface adapters, and USB ports.
Expansion enclosures do not have any of these ports.