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  • Replacement on a five year cycle or the expiration of a vendor service contract
  • Components are routinely swapped out
  • Service architecture built in a high availability mode using two techniques 1) Veritas Cluster Server (VCS) 2) Non-VCS with worker instances running on separate services monitored by the Apache load balancer
  • Typically have 3 to 5 instances running on a server farm.  We are migrating to virtual machines and using Monit by the end of 2012, but will continue to run the Apache front-end to send worker processes.