Huawei OceanStor S5600 Initial Configuration Manual page 135

OceanStor S5600 Storage System
Initial Configuration Guide
Intelligent
prefetch
Internal LUN
iSCSI host port
L
Link
Load balance
Logical unit
Logical unit
number
Loose coupling
Low watermarks
LUN expansion
LUN format
LUN mapping
M
Issue 02 (2009-09-30)
A cache prefetch strategy. The system software calculates a proper size
of prefetched data. This strategy applies to a read application involving
a single bit stream or to the situations where you do not know whether
the data is read in a certain order. An example is reading or writing a
file.
The LUN that is located in the array of the hyper copy.
A port which is on the controller subrack connects to the AS. The port
transmits service data (used in the network and bearing the SCSI
protocol in the IP packet).
A physical connection between two nodes of a network.
A method of adjusting the system, application components and data to
averagely distribute the applied I/O or computing requests for physical
resources of the system.
The entity is located inside the SCSI object, and can execute I/O
commands. After a SCSI I/O command is sent to an object, the logic
unit inside the object executes this command. Usually, each SCSI
physical disk has one logic unit. A tape drive and array controller may
have multiple logic units, which process different I/O commands. Each
logic unit inside an array controller corresponds to a virtual disk.
The SCSI identifier of the internal logical unit of a target.
A system based on messages in which the client and the remote services
do not know how the peer side is realized. The communication between
the client and the services is based on message architecture. As long as
the messages comply with the negotiated architecture, the realization of
the client or services can be changed as required without damaging the
peer side.
The low level of the dirty page stored in the cache. When the amount
of the dirty page in the cache reaches the low level, cache stops storing
the data in cache into disks.
The process of forming the connected LUN by connecting one LUN to
another LUN.
The process of preparation for enabling LUNs. During the process,
necessary information is written to member disks where LUNs are
located.
The OceanStor storage system maps LUNs to ASs so that the ASs can
access the storage reorganization.
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B Glossary
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