Mapserver in a cluster

[cozzolongo]

-----Original message-----
From: Stephen Woodbridge woodbri at SWOODBRIDGE.COM
Date: Fri,  3 Nov 2006 20:11:58 +0100
To: MAPSERVER-USERS at lists.umn.edu
Subject: Re: [UMN_MAPSERVER-USERS] Mapserver in a cluster

> percy wrote:
> > we are interested in this as well. we have a beowulf cluster, and would 
> > like to explore load-balancing in anticipation of increased demand for 
> > our geospatial data.
> > 
> > I wonder what Ed over at Topozone does :-)
> > 
> > Salvatore Cozzolongo wrote:
> >> I would put mapserver cgi in a cluster (HA or HPC). The web server 
> >> should get up the cgi in this environment. According to you, is it 
> >> possible? what type of cluster
> >> do you try to use? Best Regards to all
> >> -- 
> >> Salvatore Cozzolongo
> >>
> > 
> I can speak to how this was originally set up. I believe Ed has made 
> some changes. There are approximately 10 servers with the USGS DOQQ data 
> organized into one degree blocks and spread across the servers in a 
> somewhat random order. When a map request comes it it is directed to the 
> system that owns the one degree block at the center of the map. All 
> systems are cross mounted using a Samba file system because of its 
> ability to recover from connection failures, which NFS can not do, so 
> every system looks like it has the full compliment of DOQQS.
> 
> I'll let Ed jump in to say more if he wants.
> 
> At Where2getit, we have a cluster with 8-9 servers behind a linux load 
> balancer. The load balancer monitors the client systems and their load 
> and dispatches requests to them respectively. These systems are all 
> severing vector data, and each is full compliment of data and software. 
> In fact each is a mirror of the master for that cluster. We can pull any 
> server from the load for maintenance and the remainder will handle the 
> load. If a server has a hardware failure the load balancer will remove 
> it from the load and sysadmins are paged. If we need more capacity, we 
> can load the basic OS on a box, mirror it from the master and add it to 
> the load.
> 
> -Steve
> 

Is this  a somewhat HA-type cluster with all data replicated on all nodes in a certain mode? do i understand well? May a  linux HA heartbeat system good for this  kind of cluster, no?
Your reply is very interesting for my studies.  Very Very Very thanx...
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