Removing preexisting keys


Removing preexisting keys
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If you encountered a split-brain condition, use the vxfenclearpre utility to remove SCSI-3 registrations and reservations on the coordinator disks as well as on the data disks in all shared disk groups.

You can also use this procedure to remove the registration and reservation keys created by another node from a disk.

To clear keys after split-brain

Stop VCS on all nodes.
```
# hastop -all
```
Make sure that the port h is closed on all the nodes. Run the following command on each node to verify that the port h is closed:
```
# gabconfig -a
```
Port h must not appear in the output.
Stop I/O fencing on all nodes. Enter the following command on each node:
```
# /etc/init.d/vxfen.rc stop
```
If you have any applications that run outside of VCS control that have access to the shared storage, then shut down all other nodes in the cluster that have access to the shared storage. This prevents data corruption.
Start the vxfenclearpre script:
```
# vxfenclearpre
```

Read the script's introduction and warning. Then, you can choose to let the script run.

Do you still want to continue: [y/n] (default : n) y

The script cleans up the disks and displays the following status messages.

Cleaning up the coordinator disks... 

Cleaning up the data disks for all shared disk groups... 

Successfully removed SCSI-3 persistent registration and 
reservations from the coordinator disks as well as the 
shared data disks. 

You can retry starting fencing module. In order to 
restart the whole product, you might want to 
reboot the system.

Start the fencing module.
```
# /etc/init.d/vxfen.rc start
```
Start VCS on all nodes.
```
# hastart
```