To modify VCS configuration to enable I/O fencing

1. Save the existing configuration:

   # haconf -dump -makero

2. Stop VCS on all nodes:

   # hastop -all

3. To ensure High Availability has stopped cleanly, run gabconfig -a.

   In the output of the commans, check that Port h is not present.

4. If the I/O fencing driver vxfen is already running, stop the I/O fencing driver.

   # /etc/init.d/vxfen stop

5. Make a backup of the main.cf file on all the nodes:

   # cd /etc/VRTSvcs/conf/config
   # cp main.cf main.orig

6. On one node, use vi or another text editor to edit the main.cf file. To modify the list of cluster attributes, add the UseFence attribute and assign its value as SCSI3.

   cluster clus1(
   UserNames = { admin = "cDRpdxPmHpzS." }
   Administrators = { admin }
   HacliUserLevel = COMMANDROOT
   CounterInterval = 5
   UseFence = SCSI3
   )

   For fencing configuration in any mode except the disabled mode, the value of the cluster-level attribute UseFence is set to SCSI3.

7. Save and close the file.
8. Verify the syntax of the file /etc/VRTSvcs/conf/config/main.cf:

   # hacf -verify /etc/VRTSvcs/conf/config

9. Using rcp or another utility, copy the VCS configuration file from a node (for example, sys1) to the remaining cluster nodes.

   For example, on each remaining node, enter:

   # rcp sys1:/etc/VRTSvcs/conf/config/main.cf \
   /etc/VRTSvcs/conf/config

10. Start the I/O fencing driver and VCS. Perform the following steps on each node:

    • Start the I/O fencing driver.

      The vxfen startup script also invokes the vxfenconfig command, which configures the vxfen driver.

      # /etc/init.d/vxfen start

    • Start VCS on the node where main.cf is modified.

      # /opt/VRTS/bin/hastart

    • Start VCS on all other nodes once VCS on first node reaches RUNNING state.

      # /opt/VRTS/bin/hastart