HP StorageWorks Disk Array XP operating system configuration guide: Windows NT (A5951-96023, December 2005)

DKU (disk cabinet
unit)
The array cabinets that house the disk array physical disks.
emulation modes The logical devices (LD EVs) associated with each RAID group
are assigned an emulation mode that m akes them operate like
OPEN system d
isk drives. The emulation mode determines the
size of an LDEV:
OPEN-3: 2.46 GB
OPEN-8: 7.38 G
B
OPEN-9: 7.42 GB
OPEN-E: 13.56 GB
OPEN-L: 36 GB
OPEN-V: User-defined custom size
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.
GB Gigabytes.
HBA Host bus adapter.
host mode Each port can be configuredforaparticularhosttype. These
modes are represented as two-digit hexadecimal numbers. For
example, host mode 08 represents an HP-UX host.
LDEV Logical device. An LDEV is created when a RAID group is
carved into pieces according to the selected host emulation
mode (that is, OPEN-3, OPEN-8, OPEN-L). The number of
resulting LDEVs depends on the selected emulation mode. The
term LDEV is often used synonymously with the term volume.
LUN Logical unit number . A LUN results from mapping a SCSI
logical unit number, port ID, and LDEV ID to a RA I D group.
The size of the LU N is determined by the emulation mod e of
the LDEV and the number of LDEVs associated with the LUN.
For example, a LUN associated with two OPEN-3 LDEVs has a
size of 4,693 MB.
LUSE A LUN is normally associated with only a single LDEV. The
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 storag e. The LUSE feature
is available when the HP StorageWorks LUN Configuration
Manager product is installed.
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Glossary