HP 3PAR T-Class Installation and Deinstallation Guide

secondary system A storage system to which virtual volumes are copied to during a remote copy operation. See
also HP 3PAR Remote Copy, remote copy, and primary system.
service processor A device inserted into a rack that enables HP Customer Satisfaction personnel to locally and
remotely monitor and service storage system.
set A grouping of mirrored or parity-protected chunklets.
set size The number of chunklets in a set. Also known as mirror depth for RAID 1 sets and parity set for
RAID 5 sets.
snapshot A physical or virtual copy of a virtual volume.
snapshot
administration
space
The space on a virtual volume that is used to track changes to the data since a snapshot of a
virtual volume was created.
snapshot data
space
The space on a virtual volume that holds the data that has been changed since the first virtual
copy was created.
source volume The virtual volume from which a copy is made.
spare, spare
chunklet
A chunklet that is reserved for use in case of a failure in the system.
sparing The automatic relocation of chunklets on a physical disk to free or spare chunklets when a logging
logical disk becomes full.
stale data Data on a virtual copy that is no longer valid because of insufficient snapshot administration and
snapshot data spaces available to record new changes to a base volume.
stale snapshot A snapshot that does not track the most recent changes to its source volume.
started virtual
volume
A virtual volume that either passed autocheck upon system startup or was created since the system
was last restarted. Started virtual volumes are ready for read/write operations.
step size The number of contiguous bytes that the system accesses before moving to the next chunklet.
stopped virtual
volume
A virtual volume that has not been started and is therefore not ready for read/write operations.
storage system
midplane
An electronic circuit board that contains sockets into which power supplies and controller nodes
are plugged.
table of contents
(TOC)
The space on a physical disk that contains the internal description of the system. The TOCs on
all physical disks in the system contain the same information.
target, target port The port that is connected to and receives commands from a host computer. Also known as a
host port.
template See VLUN template.
thin provisioning See 3PAR Thin Provisioning.
thinly provisioned
virtual volume
(TPVV)
A virtual volume with no user space, that instead maps on demand to snapshot data space, as
allocated through the mapping of the TPVV to a common provisioning group (CPG), on a
copy-on-write basis.
TOC See table of contents.
U See rack unit.
user space The space on a virtual volume that represents the size of the virtual volume seen by the host to
which the virtual volume has been exported as a virtual LUN.
virtual copy A snapshot created using the copy-on-write technique.
virtual volume The mapping of data from one or more logical disks.
virtual volume
backup node
The controller node that takes over for the virtual volume master node if the virtual volume master
node fails.
virtual volume
master node
The controller node that is responsible for a virtual volume from its creation to its deletion. When
the system builds a virtual volume, the system begins with the logical disk connected to the master
node.
VLUN Stands for volume-LUN. A virtual volume-LUN pairing expressed as either an active VLUN or as
a VLUN template.
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