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RAID Controller Circuit Boards
This section gives a brief description of the RAID controller circuit
boards that are inside the RAID controller module.
Caution: The description of the RAID controller circuit boards
provided below is for information only. Only qualified service
personnel should open the RAID Controller module.
Controller Circuit Board
The controller circuit board oversees and regulates the flow of data
from a host through the I/O circuit board to the disk arrays in the Altos
S700 enclosure. The controller circuit board performs these operations
with a proprietary architecture, using the following components:
•
Main microprocessor and companion chip
•
Control-store memory
•
Memory Controller/Hardware XOR Engine ASIC (XOR ASIC)
•
Flash PROM
•
Non-volatile RAM (NVRAM)
•
Dual universal asynchronous receiver/transmitter (DUART)
•
Fibre Channel I/O processors
•
Cache DIMM memory
I/O Circuit Board
The I/O circuit board provides the interface between the enclosure and
a host, as well as general support functions. The I/O circuit board
provides the following:
•
Connections to the host
•
Connections to the enclosure
•
Dual switching power supply for +3.3 V and +2.5 V
•
Hot pluggability for the controller
•
Support for the BBU
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