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OceanStor 9000 V300R006C00 File System Feature Guide 12

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview

Overview

This section describes the background, definition, and benefits of InfoReplicator.

Background

As a core technology for disaster recovery, remote replication serves as the foundation for remote data synchronization and recovery. This technology replicates data between two storage systems that are geologically far away from each other over physical links and stores a remote backup of the local storage system. When a disaster occurs, the lost data can be recovered from its remote backup, reducing the risk of data loss.

The following must be considered for disaster recovery through remote replication:
  • Data must be replicated from the primary storage system (production storage system) to the secondary storage system (disaster recovery storage system) as quickly as possible to minimize the amount of data loss after a disaster.
  • Data from upper-layer applications must be written to the primary storage system as quickly as possible to minimize the system response time while improving data throughput and access performance.
  • Data on the secondary storage system must be available as soon as the primary storage system encounters a disaster.
Latency is unavoidable for remote replication. Remote replication is classified into synchronous and asynchronous replication based on the replication latency.
  • Synchronous replication: Data from upper-layer applications is replicated to the secondary storage system as soon as it is written onto the primary storage system. During this process, new data from upper-layer applications will not be written onto the primary storage system until an acknowledgement is returned to the applications after the previous data write is complete on both the primary and secondary storage systems. Synchronous replication ensures the instant replication of application data from the primary storage system to the secondary storage system.
  • Asynchronous replication: Data from upper-layer applications is continuously written onto the primary storage system and the changed data is recorded upon each data write. During this process, the primary storage system returns an acknowledgement to the applications immediately after it completes a data write. Later, all the changed data is synchronized to the secondary storage system at one time. The changed data can be manually synchronized by a system administrator or automatically synchronized based on the preset synchronization interval. Asynchronous replication ensures high access performance of the primary storage system.

Definition

The InfoReplicator feature of the OceanStor 9000 storage system supports asynchronous remote replication specific to directories. Folders or files can be automatically and periodically or manually replicated between multiple OceanStor 9000 storage systems through IP links over a local area network (LAN) or wide area network (WAN).

The remote replication-based data recovery goes through the following phases:
  1. Data of the primary storage system is periodically or manually replicated to the secondary storage system.
  2. When the primary storage system is faulty, access requests from upper-layer applications are failed over to the secondary storage system.
  3. When the primary storage system recovers, access requests are failed back to the primary storage system.

Benefits

Table 6-1 describes the benefits provided by InfoReplicator.
Table 6-1  Benefits of InfoReplicator

Benefits

Description

Improved disaster recovery reliability and reduced risk of data loss

Data lost in the primary storage system can be recovered from its remote backup.

Shortened downtime and improved business continuity

The primary storage system can be taken over by the secondary storage system.

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Updated: 2019-06-27

Document ID: EDOC1000122519

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