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On the back of the backplane of a controller unit are connectors for two
fan-and-power-supply assemblies 2 , two RAID FF cards 3 , and a switch card 4 .
An expansion unit has connectors for two FC-AL Interface Cards 5 instead of two
RAID FF cards 3 .
Each unit has two fan-and-power-supply assemblies 2 . If one power supply fails,
power for the unit continues to be supplied by the other power supply.
A RAID FF card 3 provides two Fibre Channel connectors. The connector on the
left is used for connection to a host computer, and the connector on the right can
be used to connect to an expansion unit.
A RAID FF card also contains logic that provides:
v Control of up to 80 FC-AL disk drives in up to eight ProFibre Storage Array
v Support for RAID levels 0, 1, 3, 5 and 0+1
v Support for data cache up to 512 MB
v Collection and reporting of enclosure services data using the ANSI SCSI
More information about the RAID FF card can be found on page 7.
FC-AL interface cards 5 in an expansion unit are used to connect the expansion
unit to a controller unit or another expansion unit. They also provide support for
SES. More information about the FC-AL interface card can be found on page 8.
The switch card 4 : There are two types of switch cards available; one for the
controller unit and one for the expansion unit. A controller unit must contain a
switch card with a Battery Backup Unit (BBU). (The BBU provides up to 72 hours
of data cache retention for the RAID FF cards in the event of there being a sudden
loss of power to the controller unit.) An expansion unit must contain a switch card
without a BBU. More information about the switch card can be found on page 9.
Controls and Lights
This section describes the switches and lights on a unit in a ProFibre Storage Array.
A unit in a ProFibre Storage Array has no main power switch. However, each
fan-and-power-supply assembly has an On/Standby switch.
During normal operations, you do not need to check the lights on the unit.
units (one controller unit and up to seven expansion units)
Enclosure Services (SES) protocol
3
Chapter 1. Introduction
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