Disk groups

A disk group is a collection of disks that share a common configuration and which are managed by VxVM. A disk group configuration is a set of records with detailed information about related VxVM objects, their attributes, and their connections. A disk group name can be up to 31 characters long.

In releases before VxVM 4.0, the default disk group was rootdg (the root disk group). For VxVM to function, the rootdg disk group had to exist and it had to contain at least one disk. This requirement no longer exists. VxVM can work without any disk groups configured (although you must set up at least one disk group before you can create any volumes of other VxVM objects).

You can create additional disk groups when you need them. Disk groups allow you to group disks into logical collections. A disk group and its components can be moved as a unit from one host machine to another.

Volumes are created within a disk group. A given volume and its plexes and subdisks must be configured from disks in the same disk group.

More Information

VM disks

Reorganizing the contents of disk groups