HP StorageWorks XP20000 Disk Array Site Preparation Guide (AE190-96002, September 2007)

control unit To organize the storage space attached to the DKC, you can group similarly
configured logical devices (LD EVs) 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 identif y 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)
Synonymous with the term ACP.
disk unit (DKU) The array hardware that houses the disk array physical disks.
disk controller
(DKC)
The array hardware that houses the channel adapters and service processor
(SVP).
disk recovery and
restore unit (DRR)
The unit responsible for d ata recovery and restoration in the event of a ca che
failure.
disk group The physical disk locations associated with a parity g roup.
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 lo g ical devices (LDEVs) associated with each R AID group are assigned an
emulationmodethatmakes them operatelikeOPEN system diskdrives. The
emulation mode determines the size of an LDEV.
OPEN-3: 2.46 GB OPEN-8: 7.38 GB O PEN-9: 7.42 GB OPEN-E: 13.56 GB
OPEN-K:Not availableonthisarray OPEN-L:36GBOPEN-M: Notavailable
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 LUSE feature allows
a
LUN to be associated with 1 to 36 LD EVs. Essentially, LUSE makes it possible
for applications to access a single large pool of storage. The LUSE feature is
available when the HP StorageWorks LUN Configuration Manager product is
installed.
ExSA Extended serial ad apter.
failover Disconnecting a failed unit or path and replacing it with an alternative unit or
path
in order to continue functioning.
FC Fibre Channel.
FC-AL Fibre Channel arbitrated loop.
FCP Fibre Channel Protocol.
fence level A level for selecting rejection of a write I/O request from the host according to
the
condition of mirroring consistency.
FICON IBM mainframe Fiber Optic Connection.
GB Gigabytes.
GLM Gigabyte link module.
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Glossary