HP StorageWorks XP20000/XP24000 - Disk Array Owner's Manual page 58

Continuous Access The HP StorageWorks XP Continuous Access program, which enables you to
replicate data stored on a local disk array to a remote disk array.
control unit To organize the storage space attached to the 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, to uniquely identify a particular LDEV requires both the CU number
and the LDEV number.
CU Control unit.
CVS Custom volume size. CVS devices (OPEN-x CVS) are custom volumes configured
using array management software to be smaller than normal fixed-size OPEN
system volumes. Synonymous with volume size customization (VSC).
disk adapter (DKA) For the XP24000/XP20000, the DKA handles the passing of data between the
cache and the physical drives. Synonymous with ACP.
disk unit (DKU) The array hardware that houses the disk array physical disks.
disk controller The array hardware that houses the channel adapters and service processor
(DKC) (SVP).
disk recovery and The unit responsible for data recovery and restoration in the event of a cache
restore unit (DRR) failure.
disk group The physical disk locations associated with an array group.
disk type The manufacturing label burned into the physical disk controller firmware. In
most cases, the disk type is identical to the disk model number.
emulation modes The logical devices (LDEVs) associated with each RAID group are assigned an
emulation mode that makes them operate like OPEN system disk drives. The
emulation mode determines the size of an LDEV.
OPEN-3: 2.46 GB
OPEN-8: 7.38 GB
OPEN-9: 7.42 GB
OPEN-E: 13.56 GB
OPEN-K: Not available on this array
OPEN-L: 36 GB
OPEN-M Not available on this array
OPEN-V: User-defined custom size
EPO Emergency power off.
ESCON Enterprise System Connection (the IBM trademark for optical channels).
expanded LUN A LUN is normally associated with only a single LDEV. The optional LUSE feature
allows a LUN to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it
possible for applications to access a single large pool of storage.
ExSA Extended serial adapter. A CHA that supports ESCON.
failover Disconnecting a failed unit or path and replacing it with an alternative unit or
path in order to continue functioning.
FC Fibre Channel.
58 Glossary for the HP XP24000/XP20000 Disk Array