VERITAS Volume Manager 3.1 Administrator's Guide

419
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 32 sectors (16K). A stripe
unit size has also historically
been referred to as a 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.
swap area A disk region used to
hold copies of memory pages
swapped out by the system pager
process.
swap volume A VxVM volume
that is configured for use asa swap
area.
transaction A set of
configuration changes that succeed
or fail as a group, rather than
individually. Transactionsareused
internally to maintain consistent
configurations.
volboot file A small file that is
used to locate copies of the root
configuration. The file may list
disks that contain configuration
copies in standard locations, and
can also contain direct pointers to
configuration copy locations.
volboot is stored in a
system-dependent location.
VM disk A disk that is both under
Volume Manager control and
assigned to a disk group. VM disks
are sometimes referred to as
Volume Manager disks or
simply disks. In the graphical
user interface, VM disks are
represented iconically as cylinders
labeled D.