VERITAS Volume Manager 3.5 User's Guide - VERITAS Enterprise Administrator (September 2004)

Volume Tasks
Creating a Dynamic Volume
Chapter 4120
• RAID-5 volumes cannot be mirrored.
• For a RAID-5 volume, the size specified in the Size field is the usable
space in the volume. Volume Manager allocates additional space for
the volume parity information. The disks across which the RAID-5
volume is striped must, therefore, contain additional free space for
the volume parity information.
• If no disks are assigned, VxVM uses available space on disks in the
selected disk group.
• If a file system is placed on the volume and the Mount at Boot
option is selected, the file system table file is automatically updated.
Mirrored
A concatenated or striped volume is mirrored (copied) on at least one
other disk. If one of the disks fails, data on the volume can be accessed
from the surviving disks. Concatenated pro and striped pro volumes are
layered and mirrored by default.
Layout: Choose Concatenated, Striped, Concatenated
Pro, or Striped Pro for the volume layout.
For a striped or striped pro volume, provide the
following information:
• In the Number of Columns field, specify the
number of columns (disks) across which the
volume should be striped. A striped volume
requires at least two disks.
• To specify a stripe unit size other than the
default, enter the stripe unit size in the
Stripe Unit Size field. To specify a size unit,
attach an s (sectors), k (kilobytes), m
(megabytes), or g (gigabytes) to the size.
Mirror Info: Select Mirrored. In the Total Number of
Mirrors field, enter the total number of mirrors
for the volume.