IBM Power Systems 775 Manual
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258 IBM Power Systems 775 for AIX and Linux HPC SolutionExample 4-22 Correcting an inconsistent topology in the cluster DB and CNM# lsnwtopoISR network topology specified by cluster configuration data is 128D# lsnwtopo -CISR network topology in use by CNM: 128DIn both cases, the expected topology is 8D not 128D. To correct the topology inthe Cluster DB to 8D and then synchronize it with CNM, perform the followingsteps:# chnwm -d# chdef -t site topology=8D# chnwm -aConfirm that the topology has been updated to 8D via lsnwtopo and lsnwtopo -C# lsnwtopoISR network topology specified by cluster configuration data is 8D# lsnwtopo -CISR network topology in use by CNM: 8DWe consider a case in which the LNMC topology on a single cage or FSP does not match thetopology of the other FSPs, and the topology that is defined in the Cluster DB and CNM. Thismismatch is determined globally via the lsnwtopo -A command as described inExample 4-21. An incorrect LNMC topology is also identified via the/var/opt/isnm/cnm/log/eventSummary.log as shown in Example 4-23 on page 258.Example 4-23 Identified incorrect LNMC topology# tail /var/opt/isnm/cnm/log/eventSummary.log11:00:26.124209 cnm_glob.cpp:1049: DB tread is starting now11:00:26.141743 cnm_glob.cpp:1049: CNM Routing thread starting.11:05:26.286466 comm_task.cpp:1765: MISMATCH: Expected frame 6 cage 11 supernode5 drawer 0 topology 4 numDlink 128, but received frame 6 cage 11 supernode 5drawer 0 topology 64 numDlink 8 Master id valid bit 1 from LNMC11:10:26.094019 comm_task.cpp:1765: MISMATCH: Expected frame 6 cage 11 supernode5 drawer 0 topology 4 numDlink 128, but received frame 6 cage 11 supernode 5drawer 0 topology 64 numDlink 8 Master id valid bit 1 from LNMCAs shown in Example 4-23, when CNM is recycled, a topology mismatch is reported andcontinues to be reported every 5 minutes until the topology is corrected in LNMC on the FSPof the identified cage.LNMC topology: The LNMC topology on frame 6 cage 11 is confirmed by issuing thefollowing lsnwtopo command:# lsnwtopo -f 6 -c 11Frame 6 Cage 11 : Topology 128D, Supernode 5, Drawer 0 |
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