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MAP 2320: SSA Link
This MAP helps you to isolate FRUs that are causing an SSA loop problem between a
device and the SSA adapter, or between two devices. If you are not familiar with SSA
loops, read the section Chapter 2, "Introducing SSA Loops" on page 7 before using this
MAP. Chapter 2, "Introducing SSA Loops" explains SSA links, strings, and loops.
Attention:
do not switch off the using system when servicing the SSA loop. Enclosure power
cables and external SSA cables that connect the devices to the using system can be
disconnected while that system is running.
1.
Are the system service aids available?
NO
YES
2. (from step 1)
Are any Ready (link status) lights flashing on this SSA loop?
NO
YES
3. (from step 1)
Run the Link Verification service aid (see "Link Verification Service Aid" on
page 383), and select the appropriate SSA adapter from the displayed Link
Verification adapter menu.
If the service aid detects pdisks for the adapter you have selected, a list of pdisks is
displayed. The diagram shows an example list:
Unless the using system needs to be switched off for some other reason,
Go to 2.
Go to step 3.
Go to "Finding the Physical Location of a Device" on page 409.
Go to "SSA Link Errors" on page 478 to analyze the problem.
Chapter 18. SSA Problem Determination Procedures
445
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