"Spreading a workload across multiple processors, coupled with
various software recovery techniques, provides a highly available
environment and enhances overall RAS (Reliability, Availability, and
Serviceability) of the environment. Benefits include faster recovery
from unplanned outages, as well as minimal effects of planned outages
on the end user."
"This article illustrates the robust Apache Web server stack with 6
Apache server nodes (though 3 nodes is sufficient for following the
steps outlined here) as well as 3 Linux Virtual Server (LVS) directors.
We used 6 Apache server nodes to drive higher workload throughputs
during testing and thereby simulate larger deployments. The
architecture presented here should scale to many more directors and
backend Apache servers as your resources permit, but we haven’t tried
anything larger ourselves. Figure 1 shows our implementation using the
Linux Virtual Server and the linux-ha.org components."
http://www.ibm.com/developerworks/linux/library/l-linux-ha/index.html
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