Hello, everyone!
This post will share with you cloud server DR.
Introduction to CSDR
CSDR provides DR protection for elastic cloud servers (ECSs). When the production center is faulty, the ECSs can be fast recovered to the remote disaster recovery (DR) center, ensuring service continuity.
Table 1 Characteristic comparison between CSDR and DR of traditional servers compares characteristics of CSDR with those of DR of traditional servers.
Table1 Characteristic comparison between CSDR and DR of traditional servers | ||
Characteristics | CSDR | DR of Traditional Servers |
Service configuration | GUI-based service application and DR configuration, shortening the service enabling period from a week to half an hour | Login to multiple devices and systems, and several times of configurations, consuming several days |
Security and performance | · Storage array-based replication, free from agents and occupying no computing resources of ECSs · Real-time synchronization, ensuring zero data loss | Physical server deployment and agent installation on physical servers, deteriorating performance |
Cost effectiveness | On-demand application and allocation and elastic expansion, reducing the initial investment | One-off purchase of DR-dedicated storage, requiring a comparatively high investment |
CSDR functions:
· Cross-region DR of ECSs
Tenants can apply for CSDR and add multiple ECSs to a CSDR service instance to ensure remote replication consistency. Remote replication DR can be implemented in synchronous or asynchronous mode. CSDR can automatically perform scheduled remote replication on arrays according to configured remote replication policies.
· DR test of ECSs
Tenants can apply for DR tests to verify the data availability in the DR center. DR tests have no affect on the production center.
· Planned migration of ECSs
In the production center, when a planned power-off (planned power outage, or routine O&M), a DR administrator can perform planned migration of ECSs by one click, ensuring zero data loss.
· Recovery of ECSs in a malfunctioning data center to a remote center
When the production center malfunctions due to a power outage, fire, or another disaster, a DR administrator can perform fault migration on ECSs by one click to fast recover ECSs to a DR center, minimizing impacts on services.
Figure 1 Working process of CSDRillustrates the working process of CSDR.
Figure1Working process of CSDR
CSDR working process
· Two sets of OpenStack are deployed for the local and remote data centers in one-to-one mode and belong to different regions.
· Production VMs and DR VMs work in active/standby DR mode. In normal situations, production VMs are running and DR VMs are shut down. Remote replication of data is performed between storage arrays.
· DR tests, drills, and fault recovery can be performed to ensure service availability.
Application Scenarios
CSDR protects data of the product center and DR center, providing optimized data security and correctness and ensuring service continuity.
Table 1 Application scenarios of CSDR lists the application scenarios of CSDR.
Table1 Application scenarios of CSDR | |
Scenario | Description |
Data center disasters | CSDR uses synchronous replication to fast recover ECSs in the same-city DR center, ensuring zero data loss. |
Regional disasters | CSDR uses asynchronous replication to recover ECSs to the remote DR center within 30 minutes, minimizing data loss. |
Routine maintenance in data centers | CSDR fast recovers ECSs to a DR center during planning maintenance (such as planned power outages), ensuring zero data loss. |
ECS breakdowns | CDSR immediately recovers ECSs to a DR center upon a breakdown, ensuring continuous running of ECSs. |
