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Chapter 1. Product Overview
EK–SMCPQ–UG. C01 1–5
1.2 Shelf Features
The RAID 3000 Controller Shelf is equipped with a dual-channel RAID control-
ler 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 V ac)
•
Dual two-speed blowers for shelf cooling
•
Cache backup provided by an external Uninterruptable Power Supply (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
1.3 Controller Shelf Enclosure
The Controller Shelf is housed in an 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 which provide the inter-
face 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 al-
lows the operator to turn off the audible alarm if desired.