We've recently purchased licenses to cover backups at a remote site (which has been scarily devoid of backups for far too long) and the site is essentially a two-host setup (VC-connected) with only internal (no shared) storage with 4 VMs running on one host and the other effectively sitting as a standby.
Thing is, these hosts are also ESXi 4.1 so well out of date & needing upgrades. Now that we've got Veeam available there and have successfully completed an initial replica from one host to the other, I was wondering if we'd be able to leverage these replicas to allow us to upgrade one host at a time.
In other words, if we "fail over" all VMs to host 2, in-place upgrade host 1 ESXi, will we then be able to fail them back to host 1 to enable us to do an in-place upgrade of host 2, or will the different ESXi versions cause us issues?
Just thinking aloud through upgrade options at this point & thought I'd double-check what's feasible as we've never needed to fail-over in anger yet, only tests/sandboxing etc.
[New Sig: PLEASE get GFS tape support for incrementals!!!]