Comments on: WAN VMotion – Now Supported by VMware

By: Mike Ascher

Mike Ascher — Fri, 18 Sep 2009 18:50:16 +0000

NetEx demonstrated HyperIP WAN Optimization software running VMotion over a 1000 mile WAN at VMworld. Using HyperIP reduced time to VMotion across the wan to nearly 1/10th the time it took using native TCP/IP.

By: vinf

vinf — Thu, 03 Sep 2009 21:20:48 +0000

virtualization of the speed of light and newtons laws, it’s the only way forward

By: Simon Long

Simon Long — Thu, 03 Sep 2009 11:09:47 +0000

Looks like VMware are going to have to try and figure out a way to make VMotion work with higher latency then. That’s if they plan to allow for further distances.

By: Rob Upham

Rob Upham — Thu, 03 Sep 2009 11:07:46 +0000

My link’s broken above… should be http://www.google.co.uk/search?q=200km+%2F+speed+of+light+*+2 – make sure to include the *2 bit.

By: Rob Upham

Rob Upham — Thu, 03 Sep 2009 11:05:16 +0000

Will we get beyond 200km? Probably … but not without latency creeping up.
Of course, VMotion will likely be tweaked and tuned to support that latency – but you’re really up against the laws of physics now.
The round-trip delay on a 200km line can never be less than 1.3ms (see: http://www.google.co.uk/search?q=(200km+%2F+speed+of+light+)*+2 ) … and that’s purely theoretical, and doesn’t take into account protocol overhead, delays in switching, etc.