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

[Stephen Hoffman]

On 2021-01-01 20:09:09 +0000, Arne Vajhj said:

> 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.

Per the VSI software product description, an OpenVMS Cluster maximum 
spam is limited to a round-trip less than 6 milliseconds, and that span 
only with VSI assistance. 
https://vmssoftware.com/docs/VSI_Clusters_SPD.pdf

VMware vMotion migration permits guest migrations with a maximum 
distance of 100 milliseconds' round-trip, per the VMware product 
requirements. https://www.vmware.com/products/vsphere/vmotion.html

Put differently, VMware vMotion supported cabling-length distances 
substantially exceed those of supported OpenVMS cluster configurations.

For those that wish to scrape the mental rust off of these speed and 
distance calculations, or that just want some semi-related humor: 
http://ibiblio.org/harris/500milemail.html



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