Finding The Physical Location Of A Device; Finding The Device When Service Aids Are Available; Finding The Device When No Service Aids Are Available - IBM 7133 Series Service Manual

Finding the Physical Location of a Device

The physical location of a device (for example, a disk drive module 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
module to flash. It also causes the Subsystem Check light of the 7133 containing the
| selected module to flash. For more details, see the chapter on SSA Service Aids in the
| SSA Adapters: User's Guide and Maintenance Information manual.
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 loop, 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) value can be a number 0 through 3. It indicates the port connector on the
SSA 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 around 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 loop. Do not include dummy devices or bypass cards.
The first device that you reach (possibly a device in a 7133) represents SSA-address
count 0. Continue to follow the SSA loop 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: Refer to the diagrams in "SSA Subsystem Configurations" on page 1-42 to ensure
that you follow the SSA loop and count, in the correct sequence, the devices that are
contained in 7133s.
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7133 Service Guide