InfoScale™ Cluster Server 9.0 Bundled Agents Reference Guide - AIX

Using the DiskGroup agent with NFS

If the file systems on the VxVM volumes are shared using NFS, you must make sure that the major number of all the volumes across the cluster nodes are consistent. By making the vxio driver numbers consistent for all nodes in a VCS cluster, it makes volume major numbers consistent on all the cluster nodes.

NFS clients know the major and minor numbers of the block device containing the file system exported by the NFS server, so when making the NFS server highly available, it is important to make sure that all nodes in the cluster that can act as NFS servers have the same major and minor numbers for the volume block device.

To determine the current value assigned to the vxio driver, enter:

# haremajor -v

For example:

# haremajor  -v
43

To determine the available major numbers on the system, enter:

# haremajor -a

For example:

# haremajor  -a
51...

To reassign the vxio driver number on the system to a specified number, enter:

# haremajor -s vxio-major-number

For example:

# haremajor  -s 51
vxio major number changed to 51
reboot the system so VxVM can restart its volumes using this major number

For more information, refer to the haremajor command manual page.