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HP XP P9500 User Manual Page 150

Continuous access synchronous for mainframe systems.
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M-VOL
Main volume.
MCU
Main control unit.
MVS
Multiple virtual storage.
P-VOL
Primary volume.
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.
path
A path is created by associating a port, a target, and a LUN ID with one or more LDEVs. Also
known as a LUN.
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.
PSUS
Pair suspended-split.
R-VOL
Remote volume.
RAID1/5
Specific RAID architectures.
RAID5-level data
A RAID that provides data striping at the byte level and also stripe error correction information.
storage
RAID5 configurations can tolerate one drive failure. Even with a failed drive, the data in a RAID5
volume can still be accessed normally.
RCU
Remote control unit.
RDC
Remote dual copy. Also known as remote copy.
Remote Web
A browser-based program installed on the SVP that allows you to configure and manage the disk
Console
array.
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.
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.
T-VOL
Target volume.
V-VOL
Virtual Volume.
VOL, vol
Volume.
volume
Volume on disk. An accessible storage area on disk, either physical or virtual.
150 Glossary

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