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2 Identifying Storage System Components
NOTE: The illustrations in this chapter are examples only and may not accurately represent your
storage system configuration.
Understanding Component Numbering
Due to the large number of prospective configurations, component placement and internal cabling
is standardized to simplify installation and maintenance. System components are placed in the
rack according to the principles outlined in this chapter, and are numbered according to their
order and location in the cabinet.
The storage system can include the following types of drive and node enclosures:
• The HP M6710 Drive Enclosure (2U24) holds up to 24, 2.5 inch small form factor (SFF) Serial
Attached SCSI (SAS) disk drives, arranged vertically in a single row at the front of the enclosure
(numbered 0 to 23). The back of the enclosure contains two 580 W power cooling modules
(PCMs) and two I/O modules. Figure 1 (page 9) shows the 2U24 drive enclosure, and also
applies to the StoreServ 7200 and 7400.
• The HP M6720 Drive Enclosure (4U24) holds up to 24, 3.5 inch large form factor (LFF) SAS
disk drives, arranged horizontally with four columns of six disk drives at the front of the
enclosure (numbered 0 to 23). The back of the enclosure contains two 580 W PCMs and two
I/O modules. Figure 2 (page 10) shows and applies only to the 4U24 drive enclosure.
• The HP 3PAR StoreServ 7200 and 7400 controller enclosures hold up to 24, 2.5 inch SFF
SAS disk drives arranged, vertically in a single row at the front of the enclosure (numbered 0
to 23). The back of the enclosure contains two 764 W PCMs and two controller nodes.
Disk Drive Numbering
There are two types of drive enclosures. The maximum number of supported drive enclosures varies
based on the model and the number of nodes.
Disk drives are mounted on a drive carrier or magazine and are located the front of the enclosures.
• 2.5-inch SFF disk drive numbering
Figure 1 HP M6710 Drive Enclosure (2U24) 2.5-inch SFF
• 3.5-inch LFF disk drive numbering
Understanding Component Numbering 9