| HIGH-AVAILABILITY |
High-availability is an absolute requirement for today's critical internet applications. Our vendors offer high-availability solutions for every aspect of a client's operating infrastructure: from the network core, to firewalls and load balancers, to databases and filesystems.
High-availability is achieved on three different levels: replication, which typically requires manual failover; clustering, where failover is automatic (and is typically includes replication as well); and multi-site high-availability, which can withstand an infrastructure failure affecting an entire facility.
The common configuration for high-availability infrastructure would include load-balanced front-end Web servers, clustered application servers, a database cluster with a separate standby replica, and mirrored onboard or external storage. Additionally, all critical components such as switches, routers, firewalls, and load-balancers are also deployed in pairs to insure redundancy at every level. Finally, mirrored components are split up among independent racks that reside on separate Power Distribution Units (PDUs), which ensures that both fault domains remain completely discrete.
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