HP StorageWorks Disk Array XP operating system configuration guide: MPE/iX (A5951-96145, November, 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 disk drives. The emulation mode d etermines the
size of an LDEV:
OPEN-3: 2.46 GB
OPEN-8: 7.38 GB
OPEN-9: 7.42 G B
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 confi guredforaparticularhosttype. These
modes are represented as two-digit hexadecimal numbers. For
example, host mode 08 represents an HP-UX host.
Ldev As it relates to MPE/iX, Ldev refers to an MPE logical device
synonymous with an MPE volume member, MPE device or LUN
created under the co ntrol of MPE/iX’s SYSGEN utility program.
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 numb
er of
resulting LDEVs depends on the selected emulation mode. The
term LDEV is often used sy nonymously 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 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.
LUSE A LUN is normally associated with only a single LDEV. The
LUSE feature allows a LUN to be associated with 1 to 36
50
Glossary