[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.

Regards,

>
> Scott
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-- 
Luis Lavena
Multimedia systems
-
Leaders are made, they are not born. They are made by hard effort,
which is the price which all of us must pay to achieve any goal that
is worthwhile.
Vince Lombardi


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