few more points to clarify...
1. The VMs in a DataCentre must auto migrated to the DR setup. ( Also the updates / writes to VMs in production in DC should be reflected to the DR copies of VMs like incremental backups. How to achieve this / or what needs to be employed to achieve this requirement.
( What all are the S/W and H/W requirements to achieve the above setup if both DC and DR is planned use OpenStack latest version/s Wallaby/ Xena/ yoga ? )
2. In the above setups once the DC down or stopped for maintenance, How the IP addresses of each VMs is managed automatically to make all the (application/database server) VMs up and running in DR in case DC down . Is this can be automated? how?
Eg: When a VM say X is running in DC it may have an IP 10.10.0. X when it is replicated in DR then it will be with the same IP address right (10.0.0.2) ? But DR Network may be different and cannot have the same IP address as DC right ? Do we need to manually set an IP (Say 10.20.0.X )for each VM which is going to run from the DR site ? Then what about the firewall rules in DR do we need to manipulate for each VM for making the DR up ? Is there a way to automate this ?
OR what the automatic mechanism to handle this IP setting up issue ? How normally folks manage this scenario ?
Also once your DC site recovered, then We need to Fail back to the DC site from DR with all changes happened to the VMs in DR must be reflected back to the DC site and Fail back.. .How to achieve this ?
Kindly shed some light on this with your experience and expertise.
What to do ? Where to start ? Which approach to follow to set up a Best failover DC to DR and Failback solution.
Thank you,
Krish