MU
mirror unit
multi-pathing
A performance and fault-tolerant technique that uses more than one physical
connection between the storage system and host system. Also called multipath I/O.
N
node volume
A level-2 primary volume in a ShadowImage cascade configuration. The secondary
volume of a layer-2 pair is called a leaf volume. See also cascade configuration.
NVS
nonvolatile storage
O
OPEN-V
A logical unit (LU) of user-defined size that is formatted for use by open-systems hosts.
OPEN-x
A logical unit (LU) of fixed size (for example, OPEN-3 or OPEN-9) that is used primarily
for sharing data between mainframe and open-systems hosts using Hitachi Cross-OS
File Exchange.
P
pair
Two logical volumes in a replication relationship in which one volume contains original
data to be copied and the other volume contains the copy of the original data. The copy
operations can be synchronous or asynchronous, and the pair volumes can be located in
the same storage system (in-system replication) or in different storage systems
(remote replication).
pair status
Indicates the condition of a copy pair. A pair must have a specific status for specific
operations. When an operation completes, the status of the pair changes to the new
status.
parity group
See RAID group.
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Glossary-14
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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