Changing NFS server major numbers for VxVM volumes


Changing NFS server major numbers for VxVM volumes
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In a VCS cluster, block devices providing NFS service must have the same major and minor numbers on each cluster node. Major numbers identify required device drivers (such as AIX partition or VxVM volume). Minor numbers identify the specific devices themselves. NFS also uses major and minor numbers to identify the exported file system. Major and minor numbers must be verified to ensure that the NFS identity for the file system is the same when exported from each node.

Use the haremajor command to determine and reassign the major number that a system uses for shared VxVM volume block devices. For Veritas Volume Manager, the major number is set to the vxio driver number. To be highly available, each NFS server in a VCS cluster must have the same vxio driver number, or major number.

To list the major number currently in use on a system

Use the command:
```
# haremajor -v
55
```

Run this command on each cluster node. If major numbers are not the same on each node, you must change them on the nodes so that they are identical.

To list the available major numbers for a system

Use the command:
```
# haremajor -a
54,56..58,60,62..
```

The output shows the numbers that are not in use on the system where the command is issued.

To reset the major number on a system

You can reset the major number to an available number on a system. For example, to set the major number to 75 type:
```
# haremajor -s 75
```