VERITAS Volume Manager 4.1 Administrator's Guide

Understanding VERITAS Volume Manager
Volume Layouts in VxVM
Chapter 1 37
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).
Figure 1-26 Example of a Striped-Mirror Layered Volume
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:
• Creating striped-mirrors. (See “Creating a Striped-Mirror Volume”
on page 248, and the vxassist(1M) manual page.)
• Creating concatenated-mirrors. (See “Creating a
Concatenated-Mirror Volume” on page 243, and the vxassist(1M)
manual page.)
• Online Relayout. (See “Online Relayout” on page 39, and the
vxrelayout(1M) and vxassist(1M) manual pages.)
• RAID-5 subdisk moves. (See the vxsd(1M) manual page.)
• Snapshots. (See “Backing Up Volumes Online Using Snapshots” on
page 308, and the vxassist(1M) manual page.)
Mirrored
Plexes
VM Disks
Underlying
Subdisks Striped Plex Volume
vol01-01
vol01
vol01-01
vop01
vop02
Concatenated
Managed by User
Managed by VxVM
Column 1
Column 0
Subdisks on
disk04-01
disk05-01
disk06-01
disk07-01
disk04-01
disk05-01
disk06-01
disk07-01
vop01
vop02
Volumes