H13-531 – HCIE - Cloud (Huawei Certified Internetwork Expert-Cloud)

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  The number of FC-nova-computed is the same as the number of clusters in VRM, one cluster corresponds to one FC-nova-compute.
  

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  In 256PM (Physical Machine) following format, it is recommended that FC-nova-compute be deployed in conjunction with the control node.
  

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  In 256PM (Physical Machine) above specification, it is recommended that FC-nova-compute be deployed independently on the Extend Controller node. FC-nova-computed for each host can be calculated by the number of host CPU/4.
  

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  FC-nova-compute use the master and backup HA deployment, single cluster corresponded to master and backup two FC-nova-compute are deployed on different control nodes. FC-nova- compute on the control
  
  node must be evenly distributed, avoide the master FC-nova-compute concentrating on a certain control node.
  
  
  

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  Backup software processing data format and the source data format is often inconsistent, you must
  restore to use: and disaster recovery often through replication or mirroring technology, the data format does not generally change, can be mounted directly to the host to use.
  

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  Backup is the basis of disaster recovery, usually refers to within the data center, all or part of the data collection from the application host's hard disk or array copied to other storage media replication process.
  

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  disaster recovery system usually refers to the remote place in the distance, the establishment of two or more sets of the same IT systems, each other can be health status monitoring and function switching, when a system due to accidents (such as fires, earthquakes Etc.) to stop working, the entire application can be switched to another location, making the system function can continue to work properly.
  

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  RPO and RTO are critical metrics for disaster recovery systems, where RPO measure system can tolerate service stopped for the longest time. The higher the urgency of the system service, the smaller the RPO value; the RTO measure system can tolerate the largest amount of data loss, the smaller system tolerate missing data volume, the smaller the RPO value is.
  
  
  

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  1->2->3->4
  

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  2->1->4->3
  

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  4->2->1->3
  

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  1->4->2->3