Adding 9s To Uptime Can Add Up
The technology used for disaster recovery and business continuity service plans differs dramaticallyThe technology used for disaster recovery and business continuity service plans differs dramatically depending on the percentage of uptime that must be guaranteed. A two-9s guarantee (99 percent uptime), for example, would allow for a couple of days of downtime per year. Although this would be acceptable for low-priority corporate applications, few transaction-heavy applications can withstand this much downtime. To guarantee 99 percent uptime, an IT manager could get by using simple tape backup without having the added expense of warm standby servers.
Boosting uptime to the three-9s level (99.9 percent uptime) would reduce acceptable downtime to a couple of hours a year. Disaster recovery providers are typically vendor-neutral, which should eliminate worries about losing the initial investments in backup systems.