HP StorageWorks XP12000 System Configuration Manual - Page 38

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HP StorageWorks XP12000 System Configuration Manual
DKU (disk cabinet
unit)
emulation modes
failover
FC
FC-AL
FCP
GB
HBA
host mode
LDEV
LUN
LUSE
38
Glossary
The array cabinets that house the disk array physical disks.
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-L: 36 GB
OPEN-V: User-defined custom size
Disconnecting a failed unit or path and replacing it with an
alternative unit or path in order to continue functioning.
Fibre Channel.
Fibre Channel arbitrated loop.
Fibre Channel Protocol.
Gigabytes.
Host bus adapter.
Each port can be configured for a particular host type. These
modes are represented as two-digit hexadecimal numbers. For
example, host mode 08 represents an HP-UX host.
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.
Logical unit number. A LUN results from mapping a SCSI
logical unit number, port ID, and LDEV ID to a RAID group.
The size of the LUN is determined by the emulation mode 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.
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 storage. The LUSE feature
is available when the HP StorageWorks LUN Configuration
Manager product is installed.