After further review, I've found out that OSS does have what MS offered in its Clustering solution.

In OSS, we have three types of clustering:

• Computational cluster


• High Availability cluster


• NLB

Computational cluster examples are the Beowulf cluster. This also includes all parallel computing, methinks.

HA cluster is where we have shared storage; either through SCSI, Fibre Channel, or network e.g DRBD). We can run applications on one host, and another group of applications on the other. If one of the hosts dies, the applications will failover to the other host. We usually use heartbeat for this setup.

NLB is where I've spent most of my time. LVS and its helper applications like Keepalived, balance (http://balance.sf.net), ultramonkey, etc lives here.

The next step is to get DRDB and heartbeat running. I'll report when done.