Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Figure 1-25 shows a typical striped-mirror layered volume where each column is

represented by a subdisk that is built from an underlying mirrored volume.

Figure 1-25

Example of a striped-mirror layered volume

Concatenated

plexes

Underlying

mirrored

volumes

Subdisks

Striped plex

Striped mirror

volume

Managed

by user

Managed

by VxVM

Subdisks on

VM disks

disk04-01 disk05-01 disk06-01 disk07-01

vop01 vop02

vop02vop01

vol01-01

Column 1Column 0

vol01

vol01-01

The volume and striped plex in the “Managed by User” area allow you to perform

normal tasks in VxVM. User tasks can be performed only on the top-level volume

of a layered volume.

Underlying volumes in the “Managed by VxVM” area are used exclusively by

VxVM and are not designed for user manipulation. You cannot detach a layered

volume or perform any other operation on the underlying volumes by manipulating

the internal structure. You can perform all necessary operations in the “Managed

by User” area that includes the top-level volume and striped plex (for example,

resizing the volume, changing the column width, or adding a column).

System administrators can manipulate the layered volume structure for

troubleshooting or other operations (for example, to place data on specific disks).

Layered volumes are used by VxVM to perform the following tasks and operations:

Understanding Veritas Volume Manager

Volume layouts in VxVM