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Remote Replication Feature Guide for File 04

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R002

"This document describes the file system remote replication feature, in terms of the implementation principle,application scenario, and explains how to configure and manage this feature."
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Requirement Analysis

Requirement Analysis

This section analyzes the requirements of a carrier that implements central backup and disaster recovery using the remote replication feature and comes to a conclusion.

Requirement Source

The carrier has a service site at place A (the service site is called site A later in this document). At site A, there is an application server of which the most important application is a user data management application. Data generated by the application server is stored in an OceanStor storage system. The data and bandwidth status of site A is as follows:
  • The daily data change amount is between 100 MB to 200 MB.
  • The total data amount does not exceed 500 GB.
  • The current network bandwidth between the application server and the storage system is 2 Mbit/s.
Since the network is complete and the application is running properly, the carrier prefers to keep the existing network. Figure 2-1 shows a diagram of the existing network.
Figure 2-1  Diagram of the existing network

Table 2-1 and Table 2-2 describe the service planning and IP address allocation on existing devices at site A.
Table 2-1  Service planning for site A

File System Name

File System Size

Application Mode


500 GB

CIFS share server. Different CIFS shares are created for different users in the file system.

Table 2-2  IP address allocation at site A


IP Address

Subnet Mask


Management network port

Host port P0 on controller A

Host port P0 on controller B

Place A suffers natural disasters from time to time. The carrier wants to protect service data at site A against natural disasters and to quickly recover the service data when a disaster happens. The specific requirements are as follows:

  • Data backup and disaster recovery

    Data at site A is automatically backed up to a backup site without interrupting services to minimize data loss upon a disaster. The backup data can be used to quickly recover services at site A after the disaster.

  • Quick service recovery

    Once a disaster happens, site B takes over services with an RTO no longer than 15 minutes.

  • Central data management

    After a new service site (site C) or even more service sites are set up, data from all service sites are backed up to the backup site for central management and reduced deployment and maintenance costs.

  • Data analysis and mining

    Service data can be exported for analysis and mining to support policy-making.

Requirement Analysis and Conclusions

The previous requirements indicate that the carrier needs a disaster recovery solution. Table 2-3 lists the considerations for implementing a remote disaster recovery solution.
Table 2-3  Considerations for implementing a remote disaster recovery solution



Data transfer amount

Inter-city data transfer is subject to the bandwidth. The amount of lost data decreases as the amount of data transferred within a specified period of time increases.

Host performance

Data backup affects services on the host. Services on the host can run properly if the impact of backup on the services is slight.

Data availability

Availability of data at the disaster recovery site is significant for data recovery. Therefore, data at the disaster recovery site must be available any time.

Service continuity

The disaster recovery site must be able to quickly take over services at the service site through a service switchover to protect service continuity.


Other factors need to be taken into consideration include cost as well as central data management and analysis.

As protecting the file server, use asynchronous remote replication for backup, and the details of the solution are as follows::

  • To choose the central backup and disaster solution and build a central backup site at place B (equipment at the backup site includes an OceanStor storage system, an application server, a maintenance terminal, and an iSCSI switch).
  • To use asynchronous remote replication for backup and disaster recovery, and set the Interval is 10 minutes to satisfy the RPO requirement..
  • To set up an iSCSI connection between site A and B.
Updated: 2019-01-02

Document ID: EDOC1000069276

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