Understanding Veritas Volume Manager

How VxVM handles storage management

27

Subdisks (each representing a specific region of a disk) are combined to form plexes

Volumes are composed of one or more plexes

Figure 1-5shows the connections between Veritas Volume Manager virtual objects and how they relate to physical disks. The disk group contains three VM disks which are used to create two volumes. Volume vol01 is simple and has a single plex. Volume vol02 is a mirrored volume with two plexes.

Figure 1-5

Connection between objects in VxVM

vol01

vol01-01

vol02

Volumes

vol02-01

vol02-02

vol01-01

disk01-01

disk01-01

disk01-01

disk01

Disk group

devname1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

vol02-01

 

 

 

vol02-02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

disk02-01

 

 

 

disk03-01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

disk02-01

disk3-01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

disk02-01

 

 

 

disk03-01

 

 

 

 

 

 

 

 

 

 

disk02

 

 

disk03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

devname2

 

devname3

 

 

 

Plexes

Subdisks

VM disks

Physical disks

The various types of virtual objects (disk groups, VM disks, subdisks, plexes and volumes) are described in the following sections. Other types of objects exist in

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HP Veritas Volume Manager 5.0 -UX 11i v3 manual Connection between objects in VxVM