HPE XP7 User Manual page 358

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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?9). The number of resulting LDEVs
depends on the selected emulation mode. The term LDEV is also known as term volume.
LUN
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.
LUSE
Logical Unit Size Expansion. The LUSE feature is available when the HPE XP7 LUN Manager
product is installed, and allows a LUN, normally associated with only a single LDEV, to be associated
with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access a single large pool
of storage.
M
MIX
A circuit board in the disk control unit that includes disk adapters and channel adapters for interfacing
disk drives and the host to cache memory.
MP blades
The MP blades are the microprocessor blades in the P9500/XP7 disk arrays. Each MP blade has four
MPs residing on it.
The MPs/DKPs that reside on the CHAs and the DKAs in the XP disk arrays form part of the MP
blades in the P9500/XP7 disk arrays.
Multiprocessor (MP)
In an XP disk array, the MPs are installed on the CHAs and the DKAs. The MPs on a CHA are
addressed as CHPs and the MPs on a DKA are addressed as DKPs.
In an P9500/XP7 disk array, the MPs do not reside on the CHAs and DKAs. Instead, they form part of
the MP blades.
O
Outband
The outband mode uses the TCP/IP to directly connect to the virtual command device in the SVP of
an array, and collect the configuration data through the SVP. Using the outband mode ensures that
the performance of the SAN is not affected because of the data collection.
P
HPE XP7 Performance Advisor
The HPE XP7 Performance Advisor is a software product from HPE for monitoring the XP and the
P9500/XP7 storage subsystems.
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