Huawei OceanStor V3 Series Features Manual page 20

OceanStor V3 Series
Remote Replication Feature Guide for Block
Figure 1-3 Writing process in asynchronous remote replication mode
Pri
mar
RM: Remote replication management module.
DCL: Data change log.
Issue 06 (2018-01-30)
1 2
RM
1 2
Primary
Cache
Primary
LUN
4
Snapshot
7
Snapshot
Primary
storage system
Primary
Primary
RM
1
Cache
y
1 Data block N 1 Data block N
2 2
Write I/O
Write I/O
result result
Data block N
3 Records the difference in the DCL
5
Data is replicated from the primary cache and LUN to the secondary cache.
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Host
DCL
3 6
5
5
Remote replication links
DCL
Primary
Primary
差异位图
LUN
LUN
6 Eliminates the
difference
in the DCL.
Secondary
Cache
Secondary
LUN
4
Snapshot
7
Snapshot
Secondary
storage system
Primary
Secondary
Secondary
LUN
Primary Secondary
LUN
Cache
LUN LUN
snapshot
The primary LUN
4
snapshot is created
Incremental data is synchronized
5
to the secondary cache
Data block N
7
The primary LUN
snapshot is stopped.
1 Feature Description
Secondary
Secondary LUN
LUN
snapshot
snapshot
The secondary LUN
4
snapshot is created
7
The secondary LUN
snapshot is stopped.
12