Thank you for your answer. I proably misunderstood the purpose of beowulf, thanks for clarifying I will continue my search for a soution.
Thanks a lot all for the help On Fri, Nov 14, 2008 at 11:34 PM, Lombard, David N < [EMAIL PROTECTED]> wrote: > On Fri, Nov 14, 2008 at 01:41:16AM -0700, Serge Fonville wrote: > > Thanks for the response (and for the questions :-)) > > > > I'll try and elaborate a bit more. > > I currently have two equal systems. (XEON 3220,8GB,80GB RAID1) > > I want to run a couple of websites (using Tomcat) and two database > servers (PostgreSQL and MySQL) > > That's a very different type of clustering. This list, the Beowulf list, > is about about clustering for HPC, to increase compute performance, usually > for scientific and engineering calculations. See below. > > > I have contintued reading a lot and I think I am starting to have a clear > idea on what is possible > > Basically I want it to appear as a single system to the outside world > while in fact there are more (currently just two). > > They should divide all usage of resources equally. If one goes down the > other notices and takes over everything, if it comes up again they are > synchronized (I am aware of the split brain issue) either server has four > network interfaces and can also be connected through an RS-232 cable. > > There are hardware and software solutions to this problem. At the > conceptual > level, you have a system--the load balancer--that routes incoming requests > to > one-of-N backing servers. If any of the backing servers fails, it's simply > ignored and future incoming requests are routed to the remaining server(s). > As long as the remaining server(s) can handle the load, all is well and > your > service is provided. > > Here's LVS, a software solution: <http://www.linuxvirtualserver.org/> > You may also want to consider Linux-HA to ensure your LVS server is robust: > <http://www.linux-ha.org/> > > There are many other details to consider, but you'll learn of those as you > research more appropriate solutions. > > HTH > -- > David N. Lombard, Intel, Irvine, CA > I do not speak for Intel Corporation; all comments are strictly my own. >
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