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OceanStor 18500, 18800, and 18800F Storage System V100R001C30 Remote Replication Feature Guide 09

This document describes the remote replication feature, in terms of the implementation principle, application scenario, configuration process, and reference information.
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Functions of a Consistency Group

Functions of a Consistency Group

In medium- and large-sized database applications, data, logs, and modification information are stored on different LUNs that are associated with each other. If data on one of the LUNs becomes unavailable, data on the other LUNs is also unusable. On this condition, you can add the pair that created by the LUNs to a consistency group. This section compares a storage system running a consistency group with a system without running a consistency group in terms of data unavailability to describe the functions of a consistency group.

Users can perform synchronization, splitting, and primary/secondary switchovers for a single remote replication session or perform these operations for multiple remote replication sessions by creating a consistency group. The following are notes for creating a consistency group:
  • Remote replication sessions can be added to a consistency group only on the primary storage system. In addition, secondary LUNs of all member remote replication sessions must be in the same remote storage system.
  • LUNs of different member remote replication sessions in a consistency group can belong to different working controllers.
  • Remote replication sessions in one consistency group must work in the same remote replication mode.
  • When a remote replication is added to a consistency group, the configuration properties of it (such as synchronization rate and recovery policy) must be the same as that of the consistency group.
The following compares remote replication sessions in a consistency group with sessions without using a consistency group in terms of synchronization result to prove that a consistency group is effective in preventing data unavailability.

Remote Replication Without Using a Consistency Group

If associated LUNs are not added to a consistency group, the possibility of data unavailability is quite high for these LUNs, as shown in Figure 1-6.
Figure 1-6  Remote replication without using a consistency group

Remote Replication Using a Consistency Group

If associated LUNs are added to a consistency group, the consistency group effectively prevents data loss, as shown in Figure 1-7.
Figure 1-7  Remote replication using a consistency group

Updated: 2019-01-28

Document ID: EDOC1000077758

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