Introduction to the VRG

For host replication disaster recovery, a Virtual Replication Gateway (VRG) is used. A VRG performs the following functions:
1. Aggregates, compresses, and encrypts VM I/O data and transmits the data to the remote site.
2. Receives data from the remote site and transmits the data to the specified host.
3. Provides management interfaces for delivering replication policies and querying statuses.
4. Ensures disaster recovery performance. Only one VRG VM can be deployed on a host. It is recommended that a VRG provide disaster recovery for a maximum of 150 VMs. The maximum write IOPS is 550.
After a VRG VM is created, be aware of the following:
1. The VRG VM-related configurations (CPU, memory, disks, and network adapters) and attributes must not be modified.
2. Capacity expansion, capacity reduction, disk mounting, disk unmounting, storage migration, and VM migration must not be performed.
3. The VRG VM does not support clone and must be installed using a template.
4. The VRG VM does not support snapshots and restoration or VM backup and restoration.
5. You can start, restart, or stop VRG VMs only during VRG VM maintenance.

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