IBM RS/6000 SP, Maintenance Information

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MAP 0560: Block Multiplexer Channel Adapter Feature (BMCA)
010 (continued)
– Go to “MAP 0570: End of Call” on page 1-357.
011
Cabling
to IBM
System/370
or
System/390
Bus
Tag
Cable
P/N 68F7211 Cable
P/N 54G3361
Terminator
P/N 6473048
Cable
P/N 54G3360
Cable
P/N 54G3360
Figure 1-38. BMCA Cabling to Multiple Processor Nodes
No obvious cabling problem found. Prepare to test interface cables.
– Remove the channel-attach (mainframe) cables from the end of cable P/N 68F7211, which is farthest
from the frame.
– Install wrap plugs, P/N 8575337 (Bus) and P/N 8575338 (Tag) on that end of the cable P/N 68F7211.
– Go to Step 012.
012
– Test all RS/6000 SP BMCA cables and terminator on this channel interface.
– Run advanced diagnostics on the suspect BMCA (“cat0”), including the cable wrap test.
Did the diagnostics fail?
Yes No
013
Have diagnostics been run from all failing nodes?
Yes No
014
– Select next failing BMCA node as the suspect node.
– Go to Step 012 to continue testing cables.
015
All RS/6000 SP adapters and cables test okay.
– If all processor nodes but one fail on this channel, suspect the good BMCA. It may be causing the
others to show errors.
– Problem might exist with channel IOCDS or application defined BMCA addressing.
– Make sure all BMCA nodes on this channel are using different address ranges
(Step 015 continues)
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-355