Editing VCS Configuration to Add the UseFence Attribute

After adding coordinator disks and configuring I/O fencing, edit the VCS configuration file, /etc/VRTSvcs/conf/config/main.cf, and add the UseFence cluster attribute.

1. Save the existing configuration:
     # haconf -dump -makero
2. Stop VCS on all nodes.
     # hastop -all 
3. Make a backup copy of the main.cf file:
     # cd /etc/VRTSvcs/conf/config 
     # cp main.cf main.orig
4. On one node, use vi or another text editor to edit the main.cf file. Modify the list of cluster attributes by adding the attribute, UseFence, and assign it a value of SCSI3. For example, with the attribute added this portion of the file resembles:
     cluster vcs_cluster2 (
           UserNames = { admin = "cDRpdxPmHpzS." }
           Administrators = { admin }
           HacliUserLevel = COMMANDROOT
           CounterInterval = 5
           UseFence = SCSI3
           )
5. Save and close the file.
6. Verify the syntax of the file /etc/VRTSvcs/conf/config/main.cf:
     # hacf -verify .
7. Using rcp, or some other available utility, copy the VCS configuration file to the other nodes. For example, on each node:
     # rcp north:/etc/VRTSvcs/conf/config/main.cf  
          /etc/VRTSvcs/conf/config
8. With the configuration file in place on each system, shut down and then restart each system.
     # shutdown -r

   If you are sure that you have no users logged in, shutdown -r -y 0 works faster than shutdown -r.

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     Note    To ensure that I/O fencing is shut down properly, use the shutdown command instead of the reboot command.

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