Controller Shelf Features; Controller Shelf Enclosure - Compaq StorageWorks RAID Array 3000 Controller Shelf User Manual

1-6 RAID Array 3000 Controller Shelf Hardware User's Guide

Controller Shelf Features

Controller Shelf Enclosure

The controller shelf is equipped with a dual-channel RAID controller that
supports all of the UltraSCSI bus features.
The major features of the controller shelf are:
One dual-channel RAID array controller
Second controller option for redundancy
Memory cache expansion option for the controller
Redundant power provided by two universal AC input power supplies
(50/60 Hz, 100 to 240 VAC)
Dual two-speed blowers for shelf cooling
Cache backup provided by an external UPS
Controls from one to four 6-slot device expansion shelves for a total of
24 UltraSCSI devices
Can be installed in a RETMA or metric style rackmount cabinets
The controller shelf is housed in a rack-mount enclosure. It has two power
supplies, a single RAID array controller, an empty slot for a second
(redundant) controller, two host I/O assemblies, and a dual-bus device I/O
assembly. Two blowers located at the back of the enclosure cool the shelf.
An internal backplane assembly connects the RAID controller and the power
and host I/O SBBs. The backplane contains five connectors that provide the
interface between the shelf SBBs and the controller. Two 300-pin connectors
located in the center of the backplane provide the controller interface. The
backplane connection to the blowers is made through two separate 9-pin
female connectors, one for each blower.
The backplane also contains a complement of circuit components that provide
SCSI bus termination, blower fail/safe circuits, UPS power sense circuit, shelf
status and DC power monitoring, and a speaker alarm circuit with an
operator-controlled alarm disable switch. The outputs of the shelf status and
DC power monitoring circuits are connected to two LED indicators on the
front panel of the shelf to notify the operator during a malfunction. The alarm
disable switch allows the operator to turn off the audible alarm if desired.