[Mongrel] [Slightly OT] Do you use virtualization in production ?

Luis Lavena luislavena at gmail.com
Tue Oct 3 22:19:07 EDT 2006

On 10/3/06, Scott Laird <laird at google.com> wrote:
> On 10/2/06, Luis Lavena <luislavena at gmail.com> wrote:
> > Ezra, one thing that still bug me is IP handling. If i have a live
> > server and decide to do a hot migration to a newer box, how it
> > manages, and how much downtime will get to the IP switches ges
> > notified of the migration? (in ms resolution)
> >
> > Or i'm forced to have a load balancer that handle the problem for me?
> If you're doing it right, the switches should notice within a few
> milliseconds.  Any reasonable virtualization setup will have to assign
> a virtual MAC address to each virtual ethernet interface, and the MAC
> address should transfer between machines along with the rest of the
> VM.  So, assuming that both machines are on the same L2 network, it's
> just a matter of the new machine sending an Ethernet frame or two out
> its interface using the virtual MAC address as the source address.  To
> the switch, it'll look like the virtual server was unplugged from one
> port and plugged into the new one, which isn't a big deal.  I'd be
> amazed if VMWare didn't have code in it to explicitly trip this, but
> even without it it'll happen almost instantly.

Thank you for your answer Scott, I'll investigate Xen further on my
spare time the following months.


> Scott
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Luis Lavena
Multimedia systems
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which is the price which all of us must pay to achieve any goal that
is worthwhile.
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