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

GL 10
Glossary
InForm OS Version 2.3.1 3PAR InForm OS Concepts Guide
rack unit (U)
The standard unit of height for an EIA-standard
rack or components housed in an EIA-standard
rack: equivalent to 1.75 in. (4.45 cm).
RAID
Stands for redundant array of independent disks.
RAID 0 set
Striped rows of chunklets on two or more
physical disks. A RAID 0 set offers no data
redundancy.
RAID 10 (RAID 1) set
A group of mirrored chunklets.
RAID 50 (RAID 5) set
A group of parity-protected chunklets. Also
known as a parity set.
RAID Multi-Parity (MP)
A group of double-parity chunklets.
RAID set
A grouping of mirrored or parity-protected
chunklets.
RAID type
RAID 0, RAID 10 (1), RAID 50 (5), and RAID MP
(6)are all supported RAID types. However, not all
RAID types may be available on your system.
RCFC
Remote Copy over Fibre Channel. The use of
3PAR Remote Copy with two storage servers that
are connected via Fibre Channel ports. See also
3PAR Remote Copy.
RCIP
Remote Copy over IP. The use of 3PAR Remote
Copy with two storage servers that are
connected via Ethernet ports. See also 3PAR
Remote Copy.
region
A subdivision of a logical disk or virtual volume.
The size of a region is always a multiple of 32
MB.
registered state change notification (RSCN)
A Fibre Channel switch function that allows
notification to registered nodes if a change
occurs to other specified nodes.
registration
See iSCSI reservation/registration.
reservation
See iSCSI reservation/registration.
resynch, resynchronize
To copy changes from one volume in a physical
copy pair to the other because that volume was
modified at some point after the physical copy
operation took place. See also physical copy.
rollback
See promote.
row
A grouping of RAID sets. Data is striped across
the rows of RAID 10 and RAID 50 logical disks.
row size
The number of sets in a row. A row is a grouping
of RAID sets. Data is striped across the rows of
RAID 10 and RAID 50 logical disks.
RSCN
See registered state change notification.
S
iSCSI reservation/registration
Allows multiple hosts to share a iSCSI interface to
access exported volumes. Multiple hosts can have
registrations to a single volume, but only one
host can have the reservation.