IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Additional Service Information

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-up. During this time, the amber and green LEDs on the controller unit will flash. After power-on, check all fault LEDs to make sure they are off. If a fault LED is on, refer to the 'Symptom-to-FRU Index'.

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 will automatically shut down. The other power supply remains on as long as its temperature remains below 70° C (158° F). If not, the second power supply will shut down, which turns off all power to the controller unit.

Once 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 'Symptom-to-FRU Index'.

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. The host ID numbers assigned to each controller are based on two elements:

•  Host ID numbers set through hardware switches on the controller unit.  There are five Host ID switches that 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.
•  Software algorithms that calculate the actual Fibre Channel address, based on the controller unit's  hardware settings and position on the loop or hub.

NOTE: This is the preferred ID that will be assigned on the Fibre Channel loop unless it is already being used. If the ID is already in use, a soft ID will be assigned.

Cable	Media Type	Data Size	Transfer Speed	Range
Fiber optic (multi-mode, 50 micrometer)	Shortwave laser	100 MB/sec	1062.5 Mbaud	up to 500 m

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