HP 3000 Enterprise Virtual Array - Manual (Page 77)

Cache battery
Two cache batteries provide backup power to maintain the contents of the controller cache when AC
power is lost and the storage system has not been shutdown properly. When fully charged the batteries
can sustain the cache contents for to 96 hours. The batteries are located behind the OCP.
Each battery includes an amber status indicator which will be on if the battery fails. If the status indicator
is on, the battery should be replaced as soon as possible.
HSV controller cabling
All data cables and power cables attach to the rear of the controller. Adjacent to each data connector is
a two-colored link status indicator. Table 23 identifies the status conditions presented by these indicators.
NOTE:
These indicators do not indicate whether there is communication on the link, only whether the link
can transmit and receive data.
The data connections are the interfaces to the disk drive enclosures or loop switches (depending on your
configuration), the other controller, and the fabric. Fiber optic cables link the controllers to the fabric,
and, if an expansion cabinet is part of the configuration, link the expansion cabinet drive enclosures to
the loop switches in the main cabinet. Copper cables are used between the controllers (mirror port) and
between the controllers and the drive enclosures or loop switches.
Racks
All storage system components are mounted in a rack. Each configuration includes two controller
enclosures (the controller pair), drive enclosures, FC loop switches (if required), and an expansion
bulkhead. Each controller pair and all the associated drive enclosures form a single storage system.
Rack configurations
Each system configuration depends on the number of disk enclosures included in the storage system. For
more information about racks and configurations, including expansion and interconnection, refer to the
HP StorageWorks Enterprise Virtual Array hardware configuration guide.
Power distribution
AC power is distributed to the rack through a dual Power Distribution Unit (PDU) assembly mounted at the
bottom rear of the rack. The characteristics of the fully-redundant rack power configuration are as follows:
• Each PDU is connected to a separate circuit breaker-protected, 30–A AC site power source
(220–240 VAC ±10%, 50 or 60–Hz, ±5%). Figure 24 illustrates the compatible 60–Hz and
50–Hz wall receptacles.
HP StorageWorks 3000/5000 Enterprise Virtual Array user guide (VCS 4.xxx) 77