HP 3PAR Operating System Software - Manual (Page 421)

Glossary
active VLUN The connection of a virtual volume and a LUN for a particular host on a particular port. An active
VLUN is created when a VLUN template is applied to the current system state. See also VLUN
template.
admin space See snapshot administration space.
admin volume The base volume that is used by the system to store administration data such as the system event
log. The admin volume is created as part of the storage system installation and setup process.
administration
space See snapshot administration space.
alert A system event requiring immediate operator activity.
alert pane The alert pane, located at the bottom of the HP 3PAR Management Console main window,
displays information about system alerts.
allocation limit User-defined threshold that can be set for thinly provisioned virtual volumes (TPVVs) to cap their
potential size. See also allocation warning.
allocation warning User-defined threshold that can be set for thinly provisioned virtual volumes (TPVVs) to alert users
when they reach a certain size. See also allocation limit.
availability Level of fault tolerance for a logical disk. For example, Magazine level availability means that
the logical disk can tolerate a drive magazine failure. Cage availability level means that the
logical disk can tolerate a drive cage failure.
backup system In a Remote Copy setup, the storage system on which the copied volume groups reside.
base volume Virtual volume type that forms the root of all virtual and physical snapshot functionality. Base
volumes are the only type of volume that have snapshot data space and snapshot administration
space used by snapshots to track changes to the base volume. See also thinly provisioned virtual
volumes (TPVVs).
cache memory
page (CMP) A 16-KB block of control cache memory where I/O requests are stored.
Cage availability Creates a virtual volume that can tolerate a drive cage failure because its RAID sets use chunklets
from different drive cages.
child volume A virtual volume (virtual or physical copy) made from a parent volume.
chunklet A 256MB block of contiguous space on a physical disk.
clean chunklet A chunklet to which no data has been written.
cluster A group of controller nodes connected via the same storage server backplane. The nodes in a
cluster operate as a unified system, separate from any other clusters that may share the same
service processor.
CMP See cache memory page.
common
provisioning group
(CPG) A set of logical disks from which you can create virtual volumes and virtual copies that are capable
of allocating storage on demand.
control cache Memory modules that support the microprocessors located in a controller node.
controller node An individual device that works together with other controller nodes to cache and manage data
in a storage system and to provide hosts with a coherent, virtualized view of the storage.
copy data Data that occupies the snapshot data space on a virtual volume. See also snapshot data space.
Copy of RCIP Remote Copy over IP. The use of HP 3PAR Remote Copy Software with two storage servers that
are connected via Ethernet ports. See also HP 3PAR Remote Copy.
copy size The size of the snapshot data space in a virtual volume, which is the amount of logical disk space
reserved for snapshots. See also snapshot data space.
CPG template Common provisioning group template. The template contains a set of common provisioning group
and logical disk parameters that can be applied again and again to create common provisioning
groups with the same characteristics using the HP 3PAR Management Console.
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