MAP 5500: Ethernet

MAP 5500: Ethernet helps you solve problems that have occurred on the SAN Volume Controller Ethernet.

If you are not familiar with these maintenance analysis procedures (MAPs), first read Using the maintenance analysis procedures.

This MAP applies to all SAN Volume Controller models. Be sure that you know which model you are using before you start this procedure. To determine which model you are working with, look for the label that identifies the model type on the front of the node.

You might have been sent here for one of the following reasons:
  • A problem occurred during the installation of a SAN Volume Controller system and the Ethernet checks failed
  • Another MAP sent you here
  • The customer needs immediate access to the cluster by using an alternate configuration node. See Defining an alternate configuration node
Perform the following steps:
  1. Is the front panel of any node in the cluster displaying Node Error with error code 540?
    YES
    Go to step 6.
    NO
    Go to step 2.
  2. Is the cluster reporting cluster error 1400 either on the front panel or in the error log?
    YES
    Go to step 4.
    NO
    Go to step 3.
  3. Are you experiencing Ethernet performance issues?
    YES
    Go to step 9.
    NO
    Go to step 10.
  4. (from step 2) On all nodes perform the following actions:
    1. Press the down button until the top line of the display shows Ethernet. If the second line of the display shows Active or Inactive, refer to the IBM® System Storage SAN Volume Controller Troubleshooting Guide, Release 4.3.1.
    2. Press right until the top line displays Ethernet port 1.
    3. If the second line of the display shows link offline, record this port as one that requires fixing.
    4. If the cluster is configured with two Ethernet cables per node, press the right button until the top line of the display shows Ethernet port 2 and repeat the previous step.
    5. Go to step 5.
  5. (from step 4) Are any Ethernet ports that have cables attached to them reporting link offline?
    YES
    Go to step 6.
    NO
    Go to step 10.
  6. (from step 5) Do the SAN Volume Controller nodes have one or two cables connected?
    One
    Go to step 7.
    Two
    Go to step 8.
  7. (from step 6) Perform the following actions:
    1. Plug the Ethernet cable from that node into the Ethernet port 2 from a different node.
    2. If the Ethernet link light is illuminated when the cable is plugged into Ethernet port 2 of the other node, replace the system board of the original node.
      Figure 1. Port 2 Ethernet link LED on the SAN Volume Controller rear panelThis figure shows the port 2 Ethernet link LED on each SAN Volume Controller rear panel
      •  1  SAN Volume Controller 2145-4F2 port 2 (upper) Ethernet link LED
      •  2  SAN Volume Controller 2145-8F2 or SAN Volume Controller 2145-8F4 port 2 (lower right) Ethernet link LED
      •  3  SAN Volume Controller 2145-8G4 port 2 (center) Ethernet link LED
      •  4  SAN Volume Controller 2145-8A4 port 2 (upper right) Ethernet link LED
      •  5  SAN Volume Controller 2145-CF8 port 2 (upper right) Ethernet link LED
    3. If the Ethernet link light does not illuminate, check the Ethernet switch/hub port and cable to resolve the problem.
    4. Verify the repair by continuing with MAP 5700: Repair verification.
  8. (from step 5 or step 6) Perform the following actions:
    1. Plug the Ethernet cable from that node into another device, for example, the SSPC.
    2. If the Ethernet link light is illuminated when the cable is plugged into the other Ethernet device, replace the system board of the original node.
    3. If the Ethernet link light does not illuminate, check the Ethernet switch/hub port and cable to resolve the problem.
    4. Verify the repair by continuing with MAP 5700: Repair verification.
  9. (from step 3) Perform the following actions:
    1. Check all Speed port 1 and Speed port 2 panels for the speed and duplex settings. The format is: <Speed>/<Duplex>.
      1. Press the down button until the top line of the display shows Ethernet. If the second line of the display shows Active or Inactive, refer to the IBM System Storage SAN Volume Controller Troubleshooting Guide, Release 4.3.1.
      2. Press the right button until the top line displays Speed 1.
      3. If the second line of the display shows link offline, record this port as one that requires fixing.
      4. If the cluster is configured with two Ethernet cables per node, press the right button until the top line of the display shows Speed 2 and repeat the previous step.
    2. Check that the SAN Volume Controller port has negotiated at the highest speed available on the switch. All nodes have gigabit Ethernet network ports.
    3. If the Duplex setting is half, perform the following steps:
      1. There is a known problem with gigabit Ethernet when one side of the link is set to a fixed speed and duplex and the other side is set to autonegotiate. The problem can cause the fixed side of the link to run at full duplex and the negotiated side of the link to run at half duplex. The duplex mismatch can cause significant Ethernet performance degradation.
      2. If the switch is set to full duplex, set the switch to autonegotiate to prevent the problem described previously.
      3. If the switch is set to half duplex, set it to autonegotiate to allow the link to run at the higher bandwidth available on the full duplex link.
    4. If none of the above are true, call your support center for assistance.
  10. (from step 2)

    A previously reported fault with the Ethernet interface is no longer present. A problem with the Ethernet might have been fixed, or there might be an intermittent problem. Check with the customer to determine that the Ethernet interface has not been intentionally disconnected. Also check that there is no recent history of fixed Ethernet problems with other components of the Ethernet network.

    Is the Ethernet failure explained by the previous checks?

    NO
    There might be an intermittent Ethernet error. Perform these steps in the following sequence until the problem is resolved:
    1. Use the Ethernet hub problem determination procedure to check for and resolve an Ethernet network connection problem. If you resolve a problem continue with MAP 5700: Repair verification.
    2. Determine if similar Ethernet connection problems have occurred recently on this node. If they have, replace the system board.
    3. Verify the repair by continuing with MAP 5700: Repair verification.
    YES
    Verify the repair by continuing with MAP 5700: Repair verification.
Parent topic: Using the maintenance analysis procedures
Related tasks
MAP 5700: Repair verification
Removing the SAN Volume Controller 2145-8G4 system board
Removing the SAN Volume Controller 2145-4F2 system board
Related reference
Front-panel display
SAN Volume Controller 2145-8F2 connectors

Defining an alternate configuration node

A situation can arise where the customer needs immediate access to the cluster by using an alternate configuration node.

If all Ethernet connections to the configuration node have failed, the cluster is unable to report failure conditions, and the SAN Volume Controller Console is unable to access the cluster to perform administrative or service tasks. If this is the case and the customer needs immediate access to the cluster, you can make the cluster use an alternate configuration node.

If only one node is displaying Node Error 540 on the front panel, perform the following steps:

  1. Press and release the power button on the node that is displaying Node Error 540.
  2. When Powering off is displayed on the front panel display, press the power button again.
  3. Restarting is displayed.
The cluster will select a new configuration node. The SAN Volume Controller Console is able to access the cluster again.
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