You’ll need to validate with Vision Solutions if Lite 5.0 will run. I’m fairly certain it will but it doesn’t hurt to ask.
Mimix and iTera HA will allow you to upgrade your systems and have your HA system at a higher release level than your host. Since it’s not replicating the operating system just your data there’s little to worry about.
It is recommended that you contact their support team before you begin the upgrade. They’ll provide you a list of PTF’s our software updates they’d expect you to have installed before you start the process.
You can have different version of OS between prod and backup having MIMIX on them but cannot have different version of mimix running on these systems. We also upgraded OS from v5R3 to V5R4 one at a time. But first you should upgrade MIMIX box(Backup) and then productions as sometime you might needs to do savrrestore type of sync and that may create some problems.