[Info-vax] WHY IS VSI REQUIRING A HYPERVISOR FOR X86 OPENVMS?

[Arne Vajhøj]

On 1/1/2021 11:31 AM, Dave Froble wrote:
> On 1/1/2021 10:13 AM, Arne Vajhøj wrote:
>> On 1/1/2021 7:17 AM, Phillip Helbig (undress to reply) wrote:
>>> Unless they need a solution where the application can survive the loss
>>> of a data centre.
>>
>> That really has not much to do with VM vs non-VM or VMS vs non-VMS.
>>
>> Data center redundancy is a common concept.
> 
> Thinking a bit more about this ....
> 
> I have no experience using VMs, other than a bit of learning a few 
> months back.  Thus I'm not real familiar with moving VM instances.
> 
> But what about a situation where flood waters are rising at one data 
> center?  How much better would it be to be able to move VM instances to 
> an alternate data center vs just shutting down the local data center and 
> letting existing VMS instances at alternate data centers continue to run?
> 
> Seems to me to not be much of an advantage, but what do I know?

I believe VMWare's ability to spin up a VM on a different ESXi server
is mostly an "within data center" thing. If you have 3 ESXi servers
and one of them get a hardware problem then VMWare can move the VM"s
to the remaining two.

In case of a total data center meltdown, then I believe something
else is needed. But even though OS clustering is still somewhat rare
then application clustering is very common.

Arne