DEC DS-HSZ22-AA, User Manual

Page: 18 / 94

RAID Array 3000 Storage Subsystem
1–4 EK–SMCPO–UG. A01
1.2 Pedestal Features
The major features of the pedestal are:
•
Two differential 16-bit UltraSCSI host buses
•
Seven 3½-inch disk drive SBB slots
•
One dual-channel RAID array controller
•
Second controller option for redundancy
•
Expansion pedestal option allowing up to fourteen SBB slots in a dual-
pedestal subsystem configuration
•
Memory cache expansion option for the controller
•
Redundant power provided by two fan-cooled universal ac input power sup-
plies (50/60 Hz, 100 to 240 V ac)
•
Cache backup provided by an external Uninterruptable Power Supply (UPS)
•
Environmental monitor unit (EMU) for error detection
•
The ability to hot swap SBBs without powering down the system
1.3 Pedestal Cabinet
The pedestal cabinet is a modular free-standing storage enclosure that is com-
pletely self contained. It has two fan-cooled power supplies, an internal EMU
circuit board, and a RAID array controller with front panel display and control.
Figure 1–2 shows the major components in the pedestal enclosure.
Figure 1–3 identifies the items on the rear panel power supplies. The character-
istics of the pedestal cabinet are outlined below.
•
The disk drive storage capacity is seven 3½-inch disk drive SBBs
•
The subsystem slots are numbered 0 through 6 from top to bottom
•
There are two 68-pin high density female SCSI connectors on the rear panel
which interconnect the host system to the RAID controller in the pedestal
•
The rear panel also contains an alarm switch, a UPS monitor connector, an
external fault condition connector, and a serial port connector (for controller
configuration)
•
The pedestal is equipped with an internal configuration switch which sets the
SCSI ID addresses of the controller and the storage devices