Huawei OceanStor V3 Series Features Manual page 13

OceanStor V3 Series
Remote Replication Feature Guide for Block
Figure 1-1 Implementation of remote replication
Pair
A pair is the relationship between a primary logical unit number (LUN) and a secondary LUN
in a remote replication task. Between pairs, data can be replicated only from the primary LUN
to the secondary LUN, and only after a pair is established between the LUNs. To be paired,
the primary and secondary LUNs must be in different storage systems.
The running status of a pair may change throughout a remote replication task. By viewing the
running status of a pair, you can determine whether that pair requires further actions and, if
so, what operation is required. After performing an operation, view the running status of the
pair to check whether the operation has succeeded.
Table 1-4
Issue 06 (2018-01-30)
Primary
storage system
Remote
replication links
Primary
LUN
Pair
Remote
replication links
Primary
LUN
Pair
Remote
replication links
Secondary
LUN
Pair'
Remote
replication links
Secondary
LUN
Pair'
Remote
replication links
Primary
LUN
Pair
describes the running status of pairs involved in a remote replication task.
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Secondary
storage system
1. Creating remote replication sessions
Secondary
· The remote replication session
LUN
corresponds to a pair.
· Multiple associated pairs can form a
consistency group.
Secondary
· Data is replicated during
LUN
synchronization.
· Users can stop synchronization by
performing a splitting operation.
Primary
· The data status and secondary
LUN
LUN's accessible property show
whether a primary/secondary
switchover can be performed.
· A new pair is generated after a
primary/secondary switchover.
Primary
Data recovery is implemented
LUN
using synchronization.
Secondary
LUN
The original pair is restored after
another primary/secondary
switchover.
1 Feature Description
2. Replicating data
3. Switching services
4. Recovering data
5. Restoring pairs
5