VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Glossary 323
VM disk
A disk that is both under VxVM control and assigned to a disk group. VM disks are
sometimes referred to as VxVM disks or simply disks.
volume
A virtual disk, representingan addressablerange ofdisk blocks used by applications such
as file systems or databases. A volume is a collection of from one to 32 plexes.
volume configuration device
The volume configuration device (/dev/vx/config) is the interface through which all
configuration changes to the volume device driver are performed.
volume device driver
The driver that forms the virtual disk drive between the application and the physical
device driver level. The volume device driver is accessed through a virtual disk device
node whose character device nodes appear in /dev/vx/rdsk, and whose block device
nodes appear in /dev/vx/dsk.
volume event log
The device interface(/dev/vx/event)throughwhich volume driverevents arereported
to utilities.
vxconfigd
The VxVM configuration daemon, which is responsible for making changes to the VxVM
configuration. This daemon must be running before VxVM operations can be performed.