Rival to the MacroSAN active-active solution

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MacroSAN active-active solution realizes disaster recovery switchover at the application level by adopting the storage remote replication feature (synchronous/asynchronous), third-party arbitration, and multipathing software equipped in the host OS. Huawei’s active-active solution has the following countermeasures:
1. MacroSAN active-active solution is asymmetric, and the system works in active/standby mode. I/Os of the standby site are forwarded to the active site. In essence, the solution uses the volume mirror. The active-active solutions of other vendors and Huawei are symmetric. There is no active/standby site and I/O requests are processed at both sites.
2. MacroSAN active-active solution has distance limitation. In this solution, devices are mirrored by 10GE links. The high latency does not allow the distance between sites to be longer than 10 km. However, Huawei active-active solution allows the distance between two sites to be 100 km.

Other related questions:
Do links between active-active arrays support port bonding?
No, the links between active-active arrays do not support port bonding.

Introduction to OceanStor ReplicationDirector in the data center disaster recovery solution (active-active mode)
The solution uses the VIS mirror function to mirror host services from the production center to the remote disaster recovery center. This achieves disaster recovery protection at zero RPO and RTO. This solution also supports the tri-mirror function, enhancing data reliability and can use VIS snapshots of protected objects to roll back data, preventing data loss and virus attacks. 1. The solution uses the VIS mirror function to mirror host services from production center 1 to production center 2. Both data centers work concurrently to share service loads, improving disaster recovery service capability and system resource utilization. The data centers are mutually backed up. If one data center fails, the other takes over its services, ensuring business continuity. 2. In this solution, deploy one piece of OceanStor ReplicationDirector to manage disaster recovery services in the active-active data centers. You are advised to deploy OceanStor ReplicationDirector at the active-active disaster recovery center. The OceanStor ReplicationDirector Agent automatically detects the applications on hosts and the storage systems used by the applications. The OceanStor ReplicationDirector Server automatically identifies the configurations of the active-active disaster recovery solution and formulates disaster recovery protection policies. 3. This solution supports the active-active (VIS) technology.

Application types supported by OceanStor ReplicationDirector in the disaster recovery data center solution (active-active mode)
The disaster recovery data center solution (active-active mode) supports the following applications:

Deployment mode of OceanStor ReplicationDirector in the data center disaster recovery solution (active-active mode)
Deploy one piece of OceanStor ReplicationDirector to manage disaster recovery services in the active-active data centers. Deploy OceanStor ReplicationDirector at the active-active disaster recovery center and ensure that the service system at the active-active production center can communicate with the storage management network.

Problem and solution when the original active firewall does not preempt the active role after recovery
Possible causes are as follows: The preemption function is disabled. The preemption hold-on timer has not expired. The original active firewall does not perform preemption immediately after recovery. Setting preemption hold-on prevents repeated switchover resulting from unstable active firewall status.

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