DS8000 Service Documentation Version 7.5

MAP7043 Private network isolation procedure 43

The Network Topology tool has been used to determine that one or both management consoles have lost connectivity to an LPAR on a single CEC enclosure (one of the two processor complexes in a storage facility) through the gray network (eth3).

Related tasks:
How to start the service information center

MAP7043 Section-1

Before you begin

In MAP7000 Entry point for storage facility private network problems, you verified that power was available to the CEC enclosure and that service processor was IML'd.

Procedure

  1. Locate Ethernet switch SW2 (Figure 1) in the storage facility that contains the affected LPAR. Use Table 1 or Table 2 to determine the locations of the switch port, CEC port, and Ethernet cable that correspond to the failing LPAR.
    Table 1. Port locations (Model 941 and 951)
    LPAR LPAR port location SW1 port location SW2 port location
    SFxxxxxxxESS0x U789D.001 .nnnnnnn-P1-C10-T1 (Upper CEC enclosure) T5 —
    SFxxxxxxxESS1x U789D.001 .nnnnnnn-P1-C10-T1 (Lower CEC enclosure) T6 —
    SFxxxxxxxESS0x U789D.001 .nnnnnnn-P1-C10-T2 (Upper CEC enclosure) — T5
    SFxxxxxxxESS1x U789D.001 .nnnnnnn-P1-C10-T2 (Lower CEC enclosure) — T6
    Table 2. Port locations (Model 961)
    LPAR LPAR port location SW1 port location SW2 port location
    SFxxxxxxxESS0x U78AA.001.nnnnnnn-P1-C2-T1 (Upper CEC enclosure) T5 —
    SFxxxxxxxESS1x U78AA.001.nnnnnnn-P1-C2-T1 (Lower CEC enclosure) T6 —
    SFxxxxxxxESS0x U78AA.001.nnnnnnn-P1-C2-T2 (Upper CEC enclosure) — T5
    SFxxxxxxxESS1x U78AA.001.nnnnnnn-P1-C2-T2 (Lower CEC enclosure) — T6
    Figure 1. 8-port Ethernet switch port designations (SW1, SW2-Tx) Model 941, Model 951, and Model 961
    8-port Ethernet switch port designations (SW1, SW2-Tx)
  2. Check the Ethernet port "link" LED on the switch and CEC Ethernet ports identified in step 1.

    Is the link LED on solid?

    • Yes, go to step 4.
    • No, confirm that the Ethernet plugs are firmly seated at each end. Attempt to reset the link by unplugging and reseating the Ethernet plugs at both ends. If the "link" LED comes on, continue with the next step. If the "link" LED stays out, make a note of this, and go to step 4.
  3. Use the Network topology tool as described in MAP7001 Using the network topology tool to check whether the problem is resolved.

    Is the network problem resolved?

    • Yes, go to MAP1500 Ending a service action to close the serviceable event, save the network topology, and ensure that good subsystem status.
    • No, continue with the next step.
  4. Is there an unused port on the same switch?
    • Yes, go to the next step.
    • No, this can occur only on an 8-port switch. Temporarily unplug the cable from port T8, and then continue at the next step.
      Note: For models 9A2 and 9B2, this might cause a new serviceable event to be opened for Ethernet communications from the second LPAR on this CEC enclosure. After this cable is reconnected in the following step, you can close that serviceable event.
  5. Move the cable plugged into the port that you located in step 1 to an unused port on the Ethernet switch.
  6. Use the Network topology tool as described in MAP7001 Using the network topology tool to check whether the problem is resolved.
    Is the network problem resolved?
    • Yes, this indicates a faulty port on the Ethernet switch. Go to MAP7043 Section-2 to replace the cable.
    • No, continue with the next step.
  7. Move the cables that were swapped in the prior steps back to their original positions.
  8. Temporarily install a new Ethernet cable in place of the existing cable between the faulty LPAR Ethernet port and the Ethernet switch port that was determined earlier.
  9. Use the Network topology tool as described in MAP7001 Using the network topology tool to check whether the problem is resolved.
    Is the network problem resolved?

MAP7043 Section-2

About this task

In this section, the SW2 Ethernet switch will be replaced.

Procedure

  1. Go to Exchanging parts to replace the SW2 Ethernet switch. Return here when you have replaced the Ethernet switch.
  2. Verify the fix using the Network topology tool as described in MAP7001 Using the network topology tool.
    Is the network problem resolved?
    • Yes, go to MAP1500 Ending a service action to close the serviceable event, save the network topology and ensure good subsystem status.
    • No, if you have other FRUs to replace, continue with the replacement. Otherwise, contact your next level of support.

MAP7043 Section-3

About this task

In this section, the faulty Ethernet cable will be replaced.

Procedure

  1. Replace the faulty Ethernet cable between the Ethernet switch and the LPAR Ethernet port.
  2. Verify the fix using the Network topology tool as described in MAP7001 Using the network topology tool.
    Is the network problem resolved?
    • Yes, go to MAP1500 Ending a service action to close the serviceable event, save the network topology, and ensure good subsystem status.
    • No, reseat the cable again and repeat this step. If the problem persists, it appears that you installed a faulty Ethernet cable or have a problem with the LPAR or CEC hardware. Replace the cable again. If replacing the cable again does not resolve the problem, go to MAP7043 Section-4 to reset the LPAR or replace the CEC hardware.

MAP7043 Section-4

About this task

In this section, the LPAR will be reset then the link will be retested.

Procedure

  1. Quiesce the LPAR that is failing. Use Storage Facility Management > storage facility > SF image > LPAR > > Change/Show LPAR State > Quiesce LPAR.
  2. Deactivate the LPAR that is failing. Use Storage Facility Management > storage facility > SF image > LPAR > Change/Show LPAR state > Shutdown LPAR.
  3. Activate the LPAR that is failing. Use Storage Facility Management > storage facility > SF image > LPAR > Change/Show LPAR state > Activate LPAR.
  4. Use the Network topology tool as described in MAP7001 Using the network topology tool to check whether communication with the LPAR is now working.
    Is communication with the LPAR now working?
    • Yes, continue with step 8.
    • No, continue with the next step.
  5. Identify the FRU that contains the failing Ethernet port using Table 3 or Table 4.
    Table 3. LPAR and FRU association (Model 941 and 951)
    LPAR FRU
    SFxxxxxxxESS01 U789D.001.nnnnnnn-P1-C10 (Upper CEC enclosure VPD pass-through card )
    SFxxxxxxxESS11 U789D.001.nnnnnnn-P1-C10 (Lower CEC enclosure VPD pass-through card)
    SFxxxxxxxESS01 U789D.001.nnnnnnn-P1 (Upper CEC enclosure I/O backplane)
    SFxxxxxxxESS11 U789D.001.nnnnnnn-P1 (Upper CEC enclosure I/O backplane)
    Note: The Ethernet adapter logic for CEC models 941 and 951 is located on the CEC enclosure VPD pass-through card and the CEC enclosure I/O backplane. At this point, you have isolated the issue to one or both of these two CEC components. Network surveillance is not designed to isolate between these two FRUs.

    Replacement of the CEC enclosure VPD pass-through card involves removing nearly all CEC components, similar to replacing the CEC enclosure I/O backplane. Because of the time required to separately replace these two FRUs, it is strongly recommended that the CEC enclosure VPD pass-through card and the CEC enclosure I/O backplane be replaced in the same service action. The only situation where the CEC enclosure VPD pass-through card is the more likely FRU is when only one Ethernet port is failing and its green link LED (the lower LED) is off. In this one case, it would be feasible to replace only the CEC enclosure VPD pass-through card.

    Table 4. LPAR and FRU association (Model 961)
    LPAR FRU
    SFxxxxxxxESS01 U78AA.001.nnnnnnn-P1-C2 (Upper CEC enclosure Ethernet two port card)
    SFxxxxxxxESS11 U78AA.001.nnnnnnn-P1-C2 (Lower CEC enclosure Ethernet two port card)
    SFxxxxxxxESS01 U78AA.001.nnnnnnn-P1 (Upper CEC enclosure system backplane)
    SFxxxxxxxESS11 U78AA.001.nnnnnnn-P1 (Lower CEC enclosure system backplane)
  6. If there is an open serviceable event calling the selected FRU, use the serviceable event to replace the FRU. If the FRU cannot be replaced using a serviceable event, then use Storage Facility Management > storage facility > Exchange Parts to select and replace the FRU.
  7. Use the Network topology tool as described in MAP7001 Using the network topology tool to check whether communication with the LPAR is now working.
    Is communication with the LPAR now working?
    • Yes, continue with step 9.
    • No, contact your next level of support.
  8. Resume the LPAR. Use Storage Facility Management > storage facility > SF image > LPAR > Resume LPAR.
  9. Go to MAP1500 Ending a service action to close the serviceable event, save the network topology, and ensure good subsystem status.