Figure 1-12 Parallel 3DC configuration in asynchronous + asynchronous mode
Storage System
LUN
Production
center
Site A
Storage System
Intra-city DR
center
Site B
Storage System
Site C
LUN
Remote DR
center
Asynchronous
Remote
Replication
Optical fiber cable
Network cable
LUN
Asynchronous
Remote
Replication
The parallel 3DC configuration in asynchronous + asynchronous mode meets the following
service requirements:
l Real-time backup and remote backup of data ensure the reliability of critical service data
and ensure that critical service data has two copies.
l Data backup of the remote DR center (C) does not depend on the intra-city DR center
(B). If the intra-city DR center (B) or remote DR center (C) fails, the production center
(A) still has a backup site.
l When a disaster occurs at the production center (A), the intra-city DR center (B) takes
over services immediately and recovers data. If the disaster also affects the intra-city DR
center (B), data in the remote DR center (C) is still available.
NOTE
The difference between 3DC in synchronous + asynchronous and asynchronous + asynchronous modes
lies in the different data synchronization modes of the production center (A) and intra-city DR center
(B). For the data synchronization mode used by the 3DC in synchronous + asynchronous mode, when
data is concurrently written to the production center (A) and intra-city DR center (B), a message is
displayed indicating that the synchronization succeeds. For the data synchronization mode used by the
3DC in asynchronous + asynchronous mode, when data is concurrently written to the production center
(A), a message is displayed indicating that the synchronization succeeds.
OceanStor V3 Series
Remote Replication Feature Guide for Block
1 Feature Description
Issue 06 (2018-01-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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