A named collection of VxVM software disks that share a common configuration is called a disk group. Common configuration refers to a set of records that provide detailed information about related VxVM software objects, their connections and attributes. This configuration information is stored in the private region of the VxVM software disks. A backup copy for each configured disk group is stored in /var/vxvm/tempdb.
Disk groups are virtual objects and have the following characteristics:
- The default disk group is rootdg.
- Additional disk groups can be created on the fly.
- Disk group names are a maximum of 31 characters in length.
- Disk groups can be renamed.
- Disk groups are versioned.
- Disk groups allow grouping of the VxVM software disks into logical collections.
- Disk groups can be moved from one system to another with an import and deport process.
- Volumes created within a specific disk group can use only the VxVM software disks that are a member of that disk group.
- Volumes and disks can be moved among disk groups.