HP Array Controller HSG V8.7 Software - Manual (Page 29)

Introducing the UltraSCSI RAID Enclosure
UltraSCSI RAID Enclosure 1–7
• EMU
• PVA
• UltraSCSI bus array controllers and cache modules
• Disk drives
• I/O modules
UltraSCSI RAID Subsystem
A subsystem is one or more departmental server cabinets or data
center cabinets with an enclosure. Each subsystem requires a master
enclosure with an UltraSCSI controller installed. Installing one or
two expansion enclosures and connecting them with cables creates an
“expanded” subsystem. See Table 1–1 for the capacities of the various
subsystems.
Note
Not all array controllers support configurations with
expansion cabinets. Refer to the array controller
documentation to ensure the controller supports expanded
configurations.
EMU
The EMU monitors the status of the UltraSCSI RAID enclosure to
include power, ambient (intake) air temperature, blower status, and
so forth. The EMU also detects error and fault conditions, displays
these conditions, reports the conditions to the user and the array
controller, and, in some cases, implements corrective actions.
Table 1–1 UltraSCSI Subsystems Capacities
Enclosures SCSI Buses Disk Drives Total Disk Drives
1 6 24 24
2 6 24 48
3 6 24 72