[Info-vax] Wide area cluster, metro area network, seeking info

[Arne Vajhøj]

On 6/8/2021 6:28 PM, Rich Jordan wrote:
> We are looking at the possibility of putting VMS boxes in two
> locations, with Integrity boxes running VSI VMS.  This is the very
> beginning of the research on the possibility of clustering those two
> servers instead of just having them networked.  Probably have to be
> master/slave since only two nodes and no shared storage.

You mean node A 2 votes and node B 1 vote?

> After reviewing the various cluster docs, they seem to be focused on
> older technologies like SoNET and DS3 using FDDI bridges (which would
> allow shared storage).  The prospect has a metropolitan area network
> but I do not have any specs on that as yet.
> 
> Are there available docs relevant to running a distributed VMS
> cluster over a metro area network or fast/big enough VPN tunnel?  Or
> is that just the straight cluster over IP configuration in the docs
> (which we've never used) that we need to concentrate on?

First you need to find out what protocols they can support. Most
likely IP only. That means you need to look at IP.

Then you need to ask a lot of questions about latency. Average,
maximum, distribution etc.. Because high latency can kill the
project.

Arne