HP XP P9500 Storage - Manual (Page 20)

Glossary
CU Control Unit. Used to organize the storage space attached to the disk controller ( DKC). You can
group similarly configured logical devices (LDEVs) with unique control unit images (CUs). CUs
are numbered sequentially. The disk array supports a certain number of CUs, depending on the
disk array model. Each CU can manage multiple LDEVs; therefore, both the CU number and the
LDEV number are required to identify an LDEV.
LDKC Logical disk controller.
OPEN- x A general term describing any of the supported OPEN emulation modes (for example, OPEN-E).
There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such as OPEN-3,
OPEN-8, OPEN-9, and OPEN-E), and OPEN-V, which has a variable size and is a CVS-based
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.
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.
RAID5-level data
storage A RAID that provides data striping at the byte level and also stripe error correction information.
RAID5 configurations can tolerate one drive failure. Even with a failed drive, the data in a RAID5
volume can still be accessed normally.
RAID6-level data
storage A RAID that provides data striping at the byte level and also stripe error correction information.
RAID6 configurations can tolerate two drive failures. Even with two failed drives, the data in a
RAID6 volume can still be accessed normally. RAID6 read performance is similar to RAID5, since
all drives can service read operations, but the write performance is lower than that of RAID5
because the parity data must be updated on multiple drives.
Remote Web
Console A browser-based program installed on the SVP that allows you to configure and manage the disk
array.
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.
V-VOL Virtual Volume.
VOL, vol Volume.
volume Volume on disk. An accessible storage area on disk, either physical or virtual.
20 Glossary