Additional Service Information; Powering On The Controller; Recovering From A Power Supply Shutdown; Connectors And Host Ids - IBM TotalStorage DS4000 Hardware Maintenance Manual

Additional service information

This section provides additional service information about the Type 3526 fibre
channel RAID controller.

Powering on the controller

Note: All drive modules must be powered on before you power on the controller.
The controller might take from three to 10 seconds to power on. During this time,
the amber and green LEDs on the controller unit flash.
After power on, check all fault LEDs to make sure they are off. If a fault LED is
on, see the "Symptom-to-FRU index" on page 32.

Recovering from a power supply shutdown

Both power supplies have a built-in temperature sensor designed to prevent the
power supplies from overheating. If a temperature sensor detects an
over-temperature condition (ambient air temperature of 70° C (158° F) or above),
the overheated power supply automatically shuts down. The other power supply
remains on as long as its temperature remains below 70° C (158° F). If not, the
second power supply shuts down, which turns off all power to the controller unit.
After the air temperature cools to below 70° C (158° F), the power supplies
automatically restart. An automatic restart resets the controllers, attempts to spin
up the drives (which has no effect on the drives if they are already running), and
returns the controller unit to a normal operating state. Typically, you will not need
to perform recovery procedures after an automatic power supply shutdown and
restart.
After a power supply shutdown, check all controller LEDs.
If the power supply power LED is off, or the amber power supply LED on the
front cover is on, go to the "Symptom-to-FRU index" on page 32.

Connectors and host IDs

The host ID switches and connectors for interface cables are on the connector plate
located on the back of the controller unit.

Host and drive ID numbers

Each controller must have a unique Fibre Host ID number (see Figure 9 on page
23). The Host ID numbers assigned to each controller are based on two elements:
v Host ID numbers set through hardware switches on the controller unit. Five
v Software algorithms that calculate the actual fibre channel address, based on the
Note: The preferred ID is assigned on the fibre channel loop unless it is already
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IBM TotalStorage DS4000: Hardware Maintenance Manual
Host ID switches allow you to set ID numbers 0 through 127 for each controller.
The factory default settings are ID #5 for Controller A and ID #4 for controller B.
controller unit's hardware settings and position on the loop or hub
being used. If the ID is already in use, a soft ID is assigned.