Huawei OceanStor V3 Series - Page 31

l When the production center (A) encounters a disaster, the intra-city DR center (B) takes
over services immediately and recovers data. If the secondary disaster damages the intra-
city DR center (B), data in the remote DR center (C) is available.
Figure 1-10 shows the cascaded 3DC in asynchronous + asynchronous mode.
Figure 1-10 Cascaded 3DC 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 cascaded 3DC in asynchronous + asynchronous mode meets the following service
requirements:
l Real-time backup and remote backup of data achieve robust reliability of critical service
data and ensure that critical service data has two copies.
l The cascaded 3DC has minor impact on the performance of the storage system in the
production center and does not affect host services.
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.
Figure 1-11 shows the parallel 3DC configuration in synchronous + asynchronous mode.
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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