3PAR InForm® OS 2.3.1 Concepts Guide (320-200112 Rev B, February 2010)

GL 9
Glossary
InForm OS Version 2.3.1 3PAR InForm OS Concepts Guide
physical copy resynch
See resynchronize.
physical disk
A dual-ported Fibre Channel disk mounted onto
a drive magazine.
physical parent
The source volume for a physical copy.
physical size
The total actual raw storage currently allocated
to a logical disk, as determined by its size and
raid type.
port-presents VLUN template
A VLUN template that allows any host connected
to a particular port to see a virtual volume as a
specified LUN. See also VLUN template.
power bank
A group of four connected AC outlets within the
power distribution unit (PDU). There are two
power banks in each PDU.
power distribution unit (PDU)
A device that takes in AC power from a main
power source (for example, an electrical wall
outlet) and distributes the power to the power
supplies in a storage server.
power supply
A device that converts current from an AC line
into appropriate DC levels and provides that
power to a storage server component.
preserved data
Data that is suspended in the system’s cache
memory due to backend failure.
preserved data logical disks
RAID 10 logical disks created by the system
during initial system setup to store preserved
data. The logical capacity of the preserved data
logical disks is equal to the sum of all data cache
memory of the system.
primary path
Connection between a controller node initiator
port and a physical disk that is used by default.
When the primary path cannot be used (a failure
condition), the secondary path is used. The
primary and secondary paths are not user
configurable and are determined by drive
magazine placement.
privilege levels
Four user privilege levels (Super, Edit, Service,
and Browse) allow varying degrees of access to
storage system administrative functions.
promote
For physical copies: to break the association
between a physical copy and a base volume by
changing the physical copy into an independent
base volume. For virtual copies: to copy the
changes from a virtual copy back onto the base
volume, therefore overwriting the base volume
with the virtual copy.
R
rack
The EIA-standard rack within a cabinet that
holds the components of a storage server.
rack filler panel
A panel used to seal off an empty 1U, 2U, or 4U
space on the rack. All empty spaces in the rack
must be sealed for EMI and airflow
considerations.