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I/O Modules
The I/O modules connect the controller nodes to the hard drives using a SAS cable, enabling the
transfer of data between the nodes, hard drives, PCMs, and enclosures. The I/O modules are
located at the rear of the drive enclosure. There are two I/O modules per enclosure, numbered 0
and 1 from bottom to top (see Figure 6 (page 12) and Figure 7 (page 12)).
Figure 6 M6710 I/O Module
Figure 7 M6720 I/O Module
NOTE: The I/O modules are located in slots 0 and 1 of the HP M6710 and HP M6720 Drive
Enclosure.
Power Cooling Modules
The power cooling module (PCM) is an integrated power supply, battery, and cooling fan. There
are two types of PCMs:
• The 580 W is used in the drive enclosures and does not include a battery.
• The 764 W is used in the node enclosures and includes a replaceable battery.
The PCMs are located at the rear of the storage system, and on the sides of the enclosure. There
are two PCMs per enclosure. The PCMs are numbered 0 and 1 from left to right.
Figure 8 PCM Numbering for HP 3PAR 7200 (2U) Controller Node Enclosure
12 Identifying Storage System Components