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51Understanding Veritas Volume Manager
Volume layouts in VxVM
Logs are associated with a RAID-5 volume by being attached as log plexes. More
than one log plex can exist for each RAID-5 volume, in which case the log areas
are mirrored.
See “Adding a RAID-5 log” on page 283 for information on how to add a RAID-5
log to a RAID-5 volume.
Layered volumes
A layered volume is a virtual Veritas Volume Manager object that is built on top
of other volumes. The layered volume structure tolerates failure better and has
greater redundancy than the standard volume structure. For example, in a
striped-mirror layered volume, each mirror (plex) covers a smaller area of
storage space, so recovery is quicker than with a standard mirrored volume.