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Chapter
4
Creating and
administering disk groups
This chapter describes how to create and manage disk groups. Disk groups are
named collections of disks that share a common configuration. Volumes are
created within a disk group and are restricted to using disks within that disk
group.
Note: In releases of Veritas Volume Manager (VxVM) prior to 4.0, a system
installed with VxVM was configured with a default disk group, rootdg, that had
to contain at least one disk. By default, operations were directed to the rootdg
disk group. From release 4.0 onward, VxVM can function without any disk group
having been configured. Only when the first disk is placed under VxVM control
must a disk group be configured. There is no longer a requirement that you
name any disk group rootdg, and any disk group that is named rootdg has no
special properties because of this name. See “Specifying a disk group to
commands” on page 167 for more information about using disk group names
that are reserved for special purposes.
Additionally, prior to VxVM 4.0, some commands such as
vxdisk were able to
deduce the disk group if the name of an object was uniquely defined in one disk
group among all the imported disk groups. Resolution of a disk group in this way
is no longer supported for any command.
For a discussion of disk groups that are compatible with the Cross-platform Data
Sharing (CDS) feature of Veritas Volume Manager, see the Veritas Storage
Foundation Cross-Platform Data Sharing Administrator’s Guide. The CDS
feature allows you to move VxVM disks and objects between machines that are
running under different operating systems.