Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

466 VERITAS Volume Manager Administrator’s Guide
spanning
A layout technique that permits a volume (and its file system or database) that is too large
to fit on a single disk to be configured across multiple physical disks.
sparse plex
A plex that is not as long as the volume or that has holes (regions of the plex that do not
have a backing subdisk).
Storage Area Network (SAN)
A networking paradigm that provides easily reconfigurable connectivity between any
subset of computers, disk storage and interconnecting hardware such as switches, hubs
and bridges.
stripe
A set of stripe units that occupy the same positions across a series of columns.
stripe size
The sum of the stripe unit sizes comprising a single stripe across all columns being
striped.
stripe unit
Equally-sized areas that are allocated alternately on the subdisks (within columns) of each
striped plex. In an array, this is a set of logically contiguous blocks that exist on each disk
before allocations are made from the next disk in the array. A stripe unit may also be
referred to as a stripe element.
stripe unit size
The size of each stripe unit. The default stripe unit size is 64KB. The stripe unit size is
sometimes also referred to as the stripe width.
striping
A layout technique that spreads data across several physical disks using stripes. The data
is allocated alternately to the stripes within the subdisks of each plex.
subdisk
A consecutive set of contiguous disk blocks that form a logical disk segment. Subdisks can
be associated with plexes to form volumes.