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Re: cluster

On Fri, Mar 29, 2002 at 09:07:39PM -0800, z l wrote:

> HA module or load balancing solutions can also be
> called as cluster ? 
> what exactly does a cluster denote.

Greg Pfister divides clusters into 3 kinds in his book:

High Availability. That's the kind you've built before, often only 2
nodes.

High Capacity. That's when you have many machines running the same
serial program. A web farm is usually a combination of high capacity
and high availablity -- the load balancer detects dead nodes and sends
them no further work.

High Performance. That's when you have many machines running a big
parallel program, like an MPI code predicting the weather. "Beowulf"
clusters often are in this category.

Many clusters are combinations of the above.

greg
-
Linux-cluster: generic cluster infrastructure for Linux
Archive:       http://mail.nl.linux.org/linux-cluster/