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

Volume Tasks
VxVM Volumes
Chapter 4110
Concatenated
Pro
• The volume is
layered, and
concatenates
several underlying
mirror volumes.
This provides
improved data
redundancy and
reduces the impact
of disk failures.
This type of volume
is also known as a
concatenated-mirro
r volume.
• Recovery time is
quicker than with
regular
concatenated
volumes that are
mirrored.
• The volume can
consist of disk
regions that are not
adjacent.
• The volume can
span multiple
disks. A spanned
volume can have a
greater capacity
than a single disk.
• A concatenated pro
volume requires at
least two disks.
• Concatenation does
not improve I/O
performance.
• Layered volumes
consist of more
VxVM objects than
non-layered volumes
and are likely to fill
up the disk group
configuration
database sooner.
When the
configuration
database is full, you
cannot create more
volumes in the disk
group.
Table 4-1 Layout Comparison (Continued)
Layout Advantages Disadvantages