HP XP P9500 Storage - Manual (Page 111)

parity group A set of hard disk drives that have the same capacity and that are treated as one group. A parity
group contains both user data and parity information, which enables user data to be accessed
if one or more drives in the group is not available.
PDU Power distribution unit. The rack device that distributes conditioned AC or DC power within a
rack.
port A physical connection that allows data to pass between a host and the disk array. The number
of ports on a disk array depends on the number of supported I/O slots and the number of ports
available per I/O adapter. The P9000 and XP family of disk arrays supports Fibre Channel (FC)
ports and other port types. Ports are named by port group and port letter, such as CL1-A. CL1 is
the group; A is the port letter.
PSUE Pair suspended-error.
PSUS Pair suspended-split.
RAID level A configuration of disk drives that uses striping, mirroring, and parity to improve performance
and data availability and reliability.
RAID Manager The CLI configuration and replication tool for the P9000 or XP disk array that system administrators
can use to enter RAID Manager commands from open-system hosts to perform Continuous Access,
Business Copy, Database Validator, and Data Retention operations, as well as provisioning
commands on logical devices.
RCU Remote control unit.
RIO Remote I/O.
S-VOL Secondary or remote volume. The copy volume that receives the data from the primary volume.
SIM Service information message.
SMPL Simplex.
SSB Sense byte.
SSD Solid state disk. A high-performance storage device that contains no moving parts. An SSD
contains DRAM or EEPROM memory boards, a memory bus board, a CPU, and a battery card.
SVP Service processor. A computer built into a disk array. The SVP, used only by an HP service
representative, provides a direct interface to the disk array.
synchronous Describes computing models that perform tasks in chronological order without interruption. In
synchronous replication, the source waits for data to be copied at the destination before
acknowledging that it has been written at the source.
takeover The process in which a remote standby disk array takes over processing from the previously active
local disk array.
V-VOL Virtual Volume.
VOL, vol Volume.
volume Volume on disk. An accessible storage area on disk, either physical or virtual.
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