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Managing Serviceguard Fifteenth Edition > Chapter 8 Troubleshooting Your Cluster

Replacing LAN or Fibre Channel Cards


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If a LAN or fibre channel card fails and the card has to be replaced, you can replace it on-line or off-line depending on the type of hardware and operating system you are running. It is not necessary to bring the cluster down to do this.

Off-Line Replacement

Follow these steps to replace an I/O card off-line.

  1. Halt the node by using the cmhaltnode command.

  2. Shut down the system using /usr/sbin/shutdown, then power down the system.

  3. Remove the defective I/O card.

  4. Install the new I/O card. The new card must be exactly the same card type, and it must be installed in the same slot as the card you removed.

  5. Power up the system.

  6. If necessary, add the node back into the cluster by using the cmrunnode command. (You can omit this step if the node is configured to join the cluster automatically.)

On-Line Replacement

If your system hardware supports hotswap I/O cards, you have the option of replacing the defective I/O card on-line, using the HP-UX olrad command. The new card must be exactly the same card type as the card you removed. Serviceguard will automatically recover a LAN card once it has been replaced and reconnected to the network.

For more information, see the olrad (1m) manpage and the Interface Card OL* Support Guide at http://docs.hp.com -> High Availability -> System Administration. See also “Removing a LAN or VLAN Interface from a Node”.

NOTE: After replacing a Fibre Channel I/O card, it may necessary to reconfigure the SAN to use the World Wide Name (WWN) of the new Fibre Channel card if Fabric Zoning or other SAN security requiring WWN is used.

After Replacing the Card

After the on-line or off-line replacement of LAN cards has been done, Serviceguard will detect that the MAC address (LLA) of the card has changed from the value stored in the cluster binary configuration file, and it will notify the other nodes in the cluster of the new MAC address. The cluster will operate normally after this.

It is also recommended that you update the new MAC address in the cluster binary configuration file by re-applying the cluster configuration. Use the following steps for on-line reconfiguration:

  1. Use the cmgetconf command to obtain a fresh ASCII configuration file, as follows:

     cmgetconf -c clustername config.ascii 
  2. Use the cmapplyconf command to apply the configuration and copy the new binary file to all cluster nodes:

     cmapplyconf -C config.ascii 

This procedure updates the binary file with the new MAC address and thus avoids data inconsistency between the outputs of the cmviewconf and lanscan commands.

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