Physical Location of a Device
The SSA address of a device is related to the position of that device on the SSA loop.
The address can, therefore, change if the configuration is changed.
You can determine the physical location of a particular disk drive module that is present
in a 7133 Model D40 or Model T40 if you use:
v
The system service aids (see Service Aids in the additional information appendix (in
this book) for your using system)
v
Other service aids
v
No service aids
See “Finding the Device When Service Aids Are Available” and “Additional Device
Location Information”.
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 module to flash. It also causes the Subsystem Check light to flash on the
7133 that contains the selected module. For more details, see the chapter on SSA
Service Aids in the user or maintenance information for your using-system SSA
attachment.
Some devices, (for example, SSA 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 loop, or use the procedure described in “Additional Device
Location Information”.
Additional Device Location Information
You can 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) value can be a number 0 through 3. It indicates the port connector on the
SSA attachment:
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 around the SSA loop).
Use the PORT value to locate the relevant connector on the SSA attachment, then
follow the SSA cable to the first real device. Include other SSA attachments as real
devices if they are in the same SSA loop. Do not include dummy devices or bypass
cards.
Chapter 1. Reference Information
59
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