4. Disaster Recovery All Main servers at will have one back up server. Primary data & Application server and a back up server at Client’s site. Another disaster recovery server at our site. All data may be replicated to remote backup server in a geographically different server if required. Local site can have two back up servers. If the sites are in sensitive areas, 3-Node scheme may be followed. Depending on crash the data to be restored from less than 15 min to 1 hour or more depending on situation. Client Primary Server Standby Server Mirrored Data Data Replication 2-Node Disaster Recovery Active Server
5. Client Primary Server Mirrored Data Data Replication Remote Standby Server Mirrored Data Data Replication Local Standby Server Local Site Active Server 3 Node Disaster Recovery
6. Client Primary Server Mirrored Data Data Replication Active Server Mirrored Data Data Replication Local Standby Server Local Site Data Replication Active Server When a site failure occurs The application data is already on the remote server so the application is able to migrate to the remote site. Disconnect local servers. Activate a new application using the remote server. Note:Presumption is that the site has a good internet connectivity. 3 Node Disaster Recovery – with Site Failure