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=item Computing Cluster

See I<High-Throughput Cluster>.

=item Enterprise Cluster

A well-administered B<enterprise infrastructure> (see
L<http://www.Infrastructures.Org>), in which each machine, whether
desktop or server, provides scalable commodity services.  Any machine
  or group of machines can be easily and quickly replaced, with
minimal user impact, without restoring from backups, with no advance
notice or unique preparation.  May include elements of both I<high
availability> and I<high throughput> clusters.  

=item High-Availability Cluster

(Also B<HA Cluster>.)  A cluster of machines optimized for providing
high uptime and minimal user impact in case of hardware failure, in
return for increased per-node expense and complexity.  Normally
includes shared disk, unattended failover of filesystem mounts and IP
and MAC addresses, and automatic daemon restart on the surviving