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26 Understanding Veritas Volume Manager
How VxVM handles storage management
See “Disk device naming in VxVM” on page 78 and “Changing the disk-naming
scheme” on page 91 for details of the standard and the enclosure-based naming
schemes, and how to switch between them.
Virtual objects
Virtual objects in VxVM include the following:
■ Disk groups
■ VM disks
■ Subdisks
■ Plexes
■ Volumes
The connection between physical objects and VxVM objects is made when you
place a physical disk under VxVM control.
After installing VxVM on a host system, you must bring the contents of physical
disks under VxVM control by collecting the VM disks into disk groups and
allocating the disk group space to create logical volumes.
Note: To bring the physical disk under VxVM control, the disk must not be under
LVM control. For more information on how LVM and VM disks co-exist or how
to convert LVM disks to VM disks, see the Veritas Volume Manager Migration
Guide
Bringing the contents of physical disks under VxVM control is accomplished
only if VxVM takes control of the physical disks and the disk is not under control
of another storage manager.
VxVM creates virtual objects and makes logical connections between the objects.
The virtual objects are then used by VxVM to do storage management tasks.
Note: The vxprint command displays detailed information on existing VxVM
objects. For additional information on the
vxprint command, see “Displaying
volume information” on page 264 and the vxprint(1M) manual page.
Combining virtual objects in VxVM
VxVM virtual objects are combined to build volumes. The virtual objects
contained in volumes are VM disks, disk groups, subdisks, and plexes. Veritas
Volume Manager objects are organized as follows:
■ VM disks are grouped into disk groups