Definition of a consistency group

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A consistency group is a collection of remote replications with service relationships. You can synchronize, split, or perform primary/secondary switchover of the remote replications in a consistency group.

In medium- and large-sized database applications, data, logs, and modification information are stored on different LUNs. If data on one of the LUNs is unavailable, data on the other LUNs is also invalid. How to keep time consistency between multiple remote replication pairs must be considered if remote disaster recovery needs to be implemented for these LUNs simultaneously. A consistency group ensures that image data of LUNs in multiple remote replication pairs is consistent regarding the time.

Other related questions:
What is an AS group
An AS group consists of a collection of instances that apply to the same scenario. It is the basis for enabling or disabling AS policies and performing scaling actions.

What Is a Consistency Group?
A consistency group is a collection of remote replications that have a service relationship with each other. You can simultaneously synchronize, split, or perform a primary/secondary switchover for all the remote replications in a consistency group. In medium- and large-sized database applications, data, logs, and modification information are stored on different LUNs. When data on one of the LUNs is unavailable, data on the other LUNs is also invalid. If remote disaster recovery needs to be implemented for these LUNs simultaneously, time consistency between multiple remote replications must be considered. The consistency group function provided remote replication ensures that multiple LUNs are consistent regarding the time.

What Is a Security Group?

A security group implements access control for ECSs within a security group and between different security groups. After a security group is created, you can create different access rules for the security group to protect the ECSs that are added to this security group.


RAID group
The definition of a RAID group is as follows: A single physical disk cannot meet requirements of a large amount of data storage and data security. A RAID group serves as a large logical disk that comprises independent physical disks of the different RAID levels, providing larger storage space. Different RAID levels meet data security requirements in different application scenarios.

Introduction to protected groups of the OceanStor ReplicationDirector
Protected groups are service objects that are protected by the disaster recovery management system. Protected groups consist of protected objects and protection policies. You can create protected groups for various protected objects such as databases, local host file systems, LUNs, NAS file systems, and VMs. Select different protection policies to implement disaster recovery based on RPO/RTO requirements.

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