Howdy all, I am thinking about how to increase the capacity of a web cluster and was wondering if anyone out there had any experience with this type of thing.
The cluster is comprised of a load-balancer, several web servers connected to a redundant pair of NFS servers and a redundant pair of MySQL servers. The current bottle-neck is, of course, the NFS servers. However, the entire thing needs an increase in capacity by several times. First of all, the web servers need a hardware upgrade and increase in total number. The expensive option would be to add a high-performance SAN which would do the trick for all of the servers that required high-performance shared storage. this would solve the NFS performance problems. However, for alot less money, one could simply do away with the file server entirely. Since this is static content, one could keep these files locally on the webservers and push the content out from a central server via rsync. I figure a pair of redundant internal web server 'staging servers' could be used for content update. Once tested, the update could be pushed to the production servers with a script using rsync and ssh. Each server, would of course, require fast and redundant disk subsystems. I think the lowest cost option is to increase the number of image servers, beef up the NFS servers and MySQL servers and add to the number of web servers in the cluster. This doesn't really solve the design problem, though. What have you guys done with web clusters? thanks! Dave -- ******************************* David Wilk System Administrator Community Internet Access, Inc. [EMAIL PROTECTED]
