Practical Scenario 2: Overview

• Original setup

  • [ip1 ip2 ip3 ip4] web servers -- underloaded
  • [ip5 ip6] email relays -- only used 12 hours/day
  • [db1] database server -- severely overloaded with read-only queries (currently handles ALL read-only and read-write transactions)

• New mod_backhand setup

  • [ip1 ip2 ip3 ip4] web servers + read-only databases
    • offloading the read-only queries to the web servers will shift load from the database server to the frontend
  • [ip5 ip6] email relays + web servers + read-only databases
    • email relays now contribute 12 hours/day each to the cluster
  • [db1] web server + read-write database
    • handling all read-write queries through local database server speeds responses.

Notes: