Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

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.
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 as a swap area.
transaction A set of configuration changes that succeed or fail as a group, rather than
individually. Transactions are used internally to maintain consistent
configurations.
VM disk A disk that is both under VxVM control and assigned to a disk group. VM disks
are sometimes referred to as VxVM disks.
volboot file A small file that is used to locate copies of the boot disk group configuration. The
file may list disks that contain configuration copies in standard locations, and
can also contain direct pointers to configuration copy locations. The volboot file
is stored in a system-dependent location.
volume A virtual disk, representing an addressable range of disk blocks used by
applications such as file systems or databases. A volume is a collection of from
one to 32 plexes.
volume configuration
device
The volume configuration device (/dev/vx/config) is the interface through which
all configuration changes to the volume device driver are performed.
volume device driver The driver that forms the virtual disk drive between the application and the
physical device driver level. The volume device driver is accessed through a virtual
disk device node whose character device nodes appear in /dev/vx/rdsk, and whose
block device nodes appear in /dev/vx/dsk.
volume event log The device interface (/dev/vx/event) through which volume driver events are
reported to utilities.
vxconfigd The VxVM configuration daemon, which is responsible for making changes to the
VxVM configuration. This daemon must be running before VxVM operations can
be performed.
Glossary568