We're currently still a smaller business and have been running our sites in 2 data centers with 4 servers in each running about 14 VMs at each data center. We've had nothing but problems with one data center and so we need to leave it.
Our "good" data center has 4 ISPs and 4 separate power sources. Until we're ready to shift our DR into the cloud we were thinking of combining all servers into a single rack, but configuring them with 2 ISPs and 2 power circuits to each set.
So each network would have the following:
- Sonicwall firewall
- Cisco switch
- 4 Windows 2019 Datacenter servers
What we're not certain about is the best way to facilitate activity between networks while still maintaining some level of separation for independent failover. Do we configure 3 subnets? 1 for each stack that is accessible through the firewall, and a 3rd for background communication between the networks, or is it better to completely isolate them and have all traffic between the two go over a VPN tunnel between the firewalls as though the data centers were still separate?
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