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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: Unless the using system needs to be switched off for some other reason,
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 Go to 2.
YES Go to step 3.
2. (from step 1)
Are any Ready (link status) lights flashing on this SSA loop?
NO Go to “Finding the Physical Location of a Device” on page 409.
YES Go to “SSA Link Errors” on page 478 to analyze the problem.
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:
LINK VERIFICATION 802386
SSA Link Verification for:
nunu:ssa0 00-04 IBM SSA 160 SerialRAID Adapter (
To Set or Reset Identify, move cursor onto selection, then press <Enter>.
Physical Serial# Adapter Port
A1 A2 B1 B2 Status
[TOP]
nunu:pdisk11 AC7AA09A 0 5 Good
nunu:pdisk8 AC7AA2D6 1 4 Good
nunu:pdisk2 AC7AA0BD 2 3 Good
nunu:pdisk3 AC7AA0B1 3 2 Good
nunu:pdisk7 AC7AA0B5 4 1 Good
nunu:pdisk12 AC7AA052 5 0 Good
nunu:pdisk0 AC7AA0B9 0 5 Good
nunu:pdisk1 AC7AA0B3 1 4 Good
nunu:pdisk10 AC7AA0B4 2 3 Good
[MORE...4]
F3=Cancel F10=Exit
Chapter 18. SSA Problem Determination Procedures 445