You need to install two clusters, and on each cluster, you need to install a minimum of one RGW daemon for client I/O and for RGW replication.
Installing the Ceph RGW multi-site v2 environment 
by Nick Fisk, Karan Singh, Vikhyat Umrao, Michael Hackett
Ceph: Designing and Implementing Scalable Storage Systems
- Title Page
- Copyright
- About Packt
- Contributors
- Preface
- Ceph - Introduction and Beyond
- Working with Ceph Block Device
- Introduction
- Configuring Ceph client
- Creating Ceph Block Device
- Mapping Ceph Block Device
- Resizing Ceph RBD
- Working with RBD snapshots
- Working with RBD clones
- Disaster recovery replication using RBD mirroring
- Configuring pools for RBD mirroring with one way replication
- Configuring image mirroring
- Configuring two-way mirroring
- Recovering from a disaster!
- Working with Ceph and OpenStack
- Working with Ceph Object Storage
- Introduction
- Understanding Ceph object storage
- RADOS Gateway standard setup, installation, and configuration
- Creating the radosgw user
- Accessing the Ceph object storage using S3 API
- Accessing the Ceph object storage using the Swift API
- Integrating RADOS Gateway with OpenStack Keystone
- Integrating RADOS Gateway with Hadoop S3A plugin 
- Working with Ceph Object Storage Multi-Site v2
- Working with the Ceph Filesystem
- Operating and Managing a Ceph Cluster
- Introduction
- Understanding Ceph service management
- Managing the cluster configuration file
- Running Ceph with systemd
- Scale-up versus scale-out
- Scaling out your Ceph cluster
- Scaling down your Ceph cluster
- Replacing a failed disk in the Ceph cluster
- Upgrading your Ceph cluster
- Maintaining a Ceph cluster
- Ceph under the Hood
- Introduction
- Ceph scalability and high availability
- Understanding the CRUSH mechanism
- CRUSH map internals
- CRUSH tunables
- Ceph cluster map
- High availability monitors
- Ceph authentication and authorization
- I/O path from a Ceph client to a Ceph cluster
- Ceph Placement Group
- Placement Group states
- Creating Ceph pools on specific OSDs
- The Virtual Storage Manager for Ceph
- More on Ceph
- Introduction
- Disk performance baseline
- Baseline network performance
- Ceph rados bench
- RADOS load-gen
- Benchmarking the Ceph Block Device
- Benchmarking Ceph RBD using FIO
- Ceph admin socket
- Using the ceph tell command
- Ceph REST API
- Profiling Ceph memory
- The ceph-objectstore-tool
- Using ceph-medic
- Deploying the experimental Ceph BlueStore
- Deploying Ceph
- BlueStore
- Erasure Coding for Better Storage Efficiency
- Developing with Librados
- Distributed Computation with Ceph RADOS Classes
- Tiering with Ceph
- Troubleshooting
- Disaster Recovery
- Operations and Maintenance
- Monitoring Ceph
- Performance and Stability Tuning
- Other Books You May Enjoy
Installing the Ceph RGW multi-site v2 environment
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