Operating System Software User Manual

Glossary
A
asynchronous
periodic mode
Data replication in which the primary and secondary volumes are resynchronized at set times—for
example, when scheduled or when resynchronization is manually initiated.
H
HP 3PAR Remote
Copy Software
A host-independent, array-based data mirroring solution that enables data distribution and disaster
recovery for applications. With this optional utility, you can copy virtual volumes from one system
to a second system. HP 3PAR Remote Copy is configured and controlled with the HP 3PAR
Command Line Interface.
L
latency A measure of time delay experienced in a network. Round-trip latency measures the time for a
signal to go from source to destination and back to the source.
P
primary storage
system
One of two storage systems in a remote-copy pair. The primary storage system holds the original
virtual volumes which are replicated to the backup storage system.
primary volume
group
The volume group that resides on the primary storage system and that receives data from the
host. The primary volume group is linked to a secondary volume group on the secondary storage
system.
R
remote copy See HP 3PAR Remote Copy Software.
remote-copy pair Two linked storage systems, consisting a primary storage system and a backup storage system.
The primary storage system holds the volumes that are copied to the remote backup storage
system.
remote-copy
volume group
A pair of virtual volume sets that are logically related and that are used when data needs to be
consistent between specified sets of virtual volumes.
RPO Recovery point objective—the maximum amount of acceptable data loss in the event of a disaster.
RPO is generally specified as an amount of time (minutes, hours, days, …). The RPO may be
zero.
RTT Round-trip time—the time, in milliseconds, that a signal takes to be sent plus the time it takes for
receipt of the signal to be acknowledged.
S
secondary storage
system
The second storage system in a remote-copy pair.
secondary volume
group
The volume group that resides on the secondary storage system and that receives data from the
primary volume group in a remote-copy pair.
SLD Synchronous long distance. In an SLD configuration, remote copy volume groups from the primary
system are replicated to two separate target arrays simultaneously. Data is replicated to one
target in synchronous mode and to the other target in asynchronous periodic mode.
synchronization
mode
The method by which data on a remote-copy pair are made consistent. Synchronization modes
are:
• synchronous
• asynchronous periodic
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