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On Thursday 28 April 2005 17:02, Samuel Tran wrote:
> On Thu, 2005-04-28 at 10:26, orpheus@xxxxxxxxxxxxxxxxxxxx wrote:
> > On Thursday 28 April 2005 15:43, Bruce Richardson wrote:
> > > On Thu, Apr 28, 2005 at 02:52:42PM +0200, orpheus@xxxxxxxxxxxxxxxxxxxx
> >
> > wrote:
> > > > Hello,
> > > >
> > > > we are using now our LVS in DR configuration. But we are considering
> > > > to move to NAT. Can somebody tell me disadvantages and advantages
> > > > (securit, connection handling, and..... ) of NAT configuration and if
> > > > it is hard (or how to, easy) to change it.
> > >
> > > The advantages of NAT are that it doesn't require any special settings
> > > (e.g. arp suppression on the application servers), that you can
> > > reconfigure which virtual ip is associated with a back-end server
> > > by modifying the director alone and that it's easier to do connection
> > > tracking. The main disadvantage is that all traffic goes through the
> > > director, making the director a potential bottleneck.
> >
> > first, thanks for answer
> > do you have some recommendations on hardware used for that?
> > I think 2 eth cards are real minimum for that, but would it help to have
> > 3 or 4 ? How it is with CPU and memory. Right now it is PIII 700MHz
> > (735.315MHz :) ) with 512MB of memory with one eth card.
>
> NAT is definitely simpler to implement than DR.
> However you can achieve higher throughput with DR since packets are only
> forwarded to the real servers, unchanged.
>
> Please take a look at these documentations:
>
> * Performance Evaluation of Linux Virtual Server
> http://www.usenix.org/events/lisa2001/tech/full_papers/orourke/orourke_html
>/
>
> * Horms LVS White Paper
> http://www.ultramonkey.org/papers/lvs_tutorial/html/
>
> What kind of throughput are you looking for?
>
right now it's around 50Mbps, max throughput should be 100Mbps ( offcourse
it's just web traffic )
thanks for these docs (good night reading) :)
--
-----------[ Signature ]---------
Name: Pavol Cvengros
Company: Prime Interactive, Ltd.
E-mail: pavol.cvengros@xxxxxxxxxxxxxxxxxxxx
Web: http://www.primeinteractive.net
Personal web: http://orpheus.grass.sk
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