3PAR InForm® OS 2.2.4 Concepts Guide (320-200085 Rev B, March 2009)

GL 2
Glossary
InForm OS Version 2.2.4 3PAR InForm OS Concepts Guide
alert
An alert is a system event that requires the
immediate attention of the user, and may also
require user intervention. See also event.
alert pane
The alert pane, located at the bottom of the
InForm Management Console main window,
displays information about system alerts.
allocation limit
User-defined threshold that can be set for thinly
provisioned virtual volumes (TPVVs) and
commonly provisioned virtual volumes (CPVVs)
to cap their potential size. See also allocation
warning.
allocation warning
User-defined threshold that can be set for thinly
provisioned virtual volumes (TPVVs) and
commonly provisioned virtual volumes (CPVVs)
to alert users when they reach a certain size. See
also allocation limit.
arbitrated loop physical address (AL_PA)
A unique 8-bit value used to identify Fibre
Channel devices on an arbitrated loop.
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.
B
backup node
See virtual volume backup node.
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) and
commonly provisioned virtual volumes (CPVVs).
battery backup unit (BBU)
A unit containing two batteries. Each battery
backup unit supplies two controller nodes with
enough current to write the cache to ATA disks
in the event of a power interruption.
battery tray
An enclosure that inserts into an EIA-standard
rack to house a maximum of four battery backup
units.
BBU
See battery backup unit.
C
cabinet
An enclosure that houses the components of a
storage server. A cabinet is made up of a frame
on four wheels, cosmetic panels, a rear door, an
EIA-standard rack, PDUs, power cords, and
bezels.
cache memory page (CMP)
A 16-KB block of control cache memory where
I/O requests are stored.
cage
See drive cage.
chassis bay
A space in a rack into which a battery tray, drive
chassis, controller node, or service processor is
inserted.