Re: [Xen-users] Server purchase pointers

[Javier Guerra Giraldez <javier@xxxxxxxxxxx>]

On Fri, Feb 24, 2012 at 5:05 AM, Bart Coninckx <bart.coninckx@xxxxxxxxxx> wrote:
> I've been assured that the line performs close to a LAN connection.


don't believe that until you see hard round-trip-time numbers.  LAN
latencies are under a single milisecond (unless badly configured), but
even short WANs are hard pressed to go under 10msec.

WAN vendors like to say "it's like local LAN", but they omit that
they're talking about bandwidth, not latency.  and for other
latency-sensitive protocols (SMB file sharing is one of the worst),
they have specific 'accelerators' (in short, big proxies cacheing most
of the metadata going each way).  if you deploy your own 'weird'
protocol, you're on your own, and get the whole ugly scene.


but, if you ge your own dark fiber, then it might be just right!  (if
you do good traffic shaping.... a whole dark art on its own)



-- 
Javier

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