Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

A volume with data spread evenly across multiple disks. Stripes
are equal-sized fragments that are allocated alternately and evenly
to the subdisks of a single plex. There must be at least two subdisks
in a striped plex, each of which must exist on a different disk.
Throughput increases with the number of disks across which a
plex is striped. Striping helps to balance I/O load in cases where
high traffic areas exist on certain subdisks.
See “Striping (RAID-0)” on page 40.
Striped
A volume with multiple data plexes that duplicate the information
contained in a volume. Although a volume can have a single data
plex, at least two are required for true mirroring to provide
redundancy of data. For the redundancy to be useful, each of these
data plexes should contain disk space from different disks.
See “Mirroring (RAID-1)” on page 44.
Mirrored
A volume that uses striping to spread data and parity evenly across
multiple disks in an array. Each stripe contains a parity stripe
unit and data stripe units. Parity can be used to reconstruct data
if one of the disks fails. In comparison to the performance of
striped volumes, write throughput of RAID-5 volumes decreases
since parity information needs to be updated each time data is
modified. However, in comparison to mirroring, the use of parity
to implement data redundancy reduces the amount of space
required.
See “RAID-5 (striping with parity)” on page 47.
RAID-5
A volume that is configured as a striped plex and another plex
that mirrors the striped one. This requires at least two disks for
striping and one or more other disks for mirroring (depending on
whether the plex is simple or striped). The advantages of this
layout are increased performance by spreading data across
multiple disks and redundancy of data.
See “Striping plus mirroring (mirrored-stripe or RAID-0+1)”
on page 45.
Mirrored-stripe
275Creating volumes
Types of volume layouts