Compex Systems Advanced SerialRAID Adapters SA33-3285-02 - Manual (Page 429)

Finding the Physical Location of a Device
The physical location of a device (for example, a disk drive or an SSA adapter) cannot
be reported directly by the using system because of the way in which the SSA interface
works. The address of an SSA device is related to the position of that device on the
SSA loop. The address can, therefore, change if the configuration is changed.
Finding the Device When Service Aids Are Available
To help you to find the correct physical disk drive, the SSA service aids include an
Identify function. This function, when selected, causes the Check light of the selected
disk drive to flash. It also causes the Subsystem Check light (if present) of the unit
containing the selected disk drive to flash.
Some devices, (for example, adapters) do not have Check lights. To find such a device,
you can either use the Identify function to identify devices that are next to the SSA
adapter on the SSA link, or use the procedure described in “Finding the Device When
No Service Aids Are Available”.
Finding the Device When No Service Aids Are Available
When no service aids are available, you must find the device by using the port (P) and
SSA-address (AA) values that are provided by some service request numbers (SRNs).
Examples of these SRNs are 43PAA, 44PAA, and 45PAA.
The port (P) values are related to the port connectors of the adapter:
0 = Connector A1
1 = Connector A2
2 = Connector B1
3 = Connector B2
The AA value is the decimal SSA-address value. It indicates the position of the device
that you are trying to find (counted along the SSA loop).
Use the port value to locate the relevant connector on the SSA adapter, then follow the
SSA cable to the first real device. Include other adapters as real devices if they are in
the same SSA link. Do not include dummy devices or bypass cards.
The first device that you reach represents SSA-address count 0. Continue to follow the
SSA links from device to device, increasing the SSA-address count by 1 for each
device, until you reach the device that is indicated in the SRN.
Note: If the SRN is 20xxx, 45xxx, or D6xxx, the failing link is between the device that
is located at PAA, and the device that is located at PAA minus 1.
Chapter 17. SSA Service Aids 409
:
: