CRITICAL SYSTEMS AND FUNCTIONS
MTD (Maximum Tolerable Downtime): This is the longest period of time a business outage without this causing permanent business failure. Each organization will have its own MTD.
RTO (Recovery Time Objective): This is the expected time it will take to get a system back online and functional. If the RTO exceeds the MTD, have a plan in place to move to an alternate site.
RPO (Recovery Point Objective): This the measure in a time of how much data the company is will to lose. IF the RPO is 4 hours, the backup must run every 4 hours, if the RPO is 12 hours, a backup must run every 12 hours.
KPI (Key Performance Indicators): This is a measurement of the reliability of an asset such as a server.
1. MTTF (Mean Time to Failure): This is normally an estimate of the expected lifetime of a product, estimated in thousands of hours.
2. MTBF (Mean Time Between Failures): This is the rating of a component/device that predicts the time between failures. This can be list in ten of thousands or thousands of hours.
3. MTTR (Mean Time to Repair): This is the actual time it takes to get a system back online. People often confuse this with RTO which is the expected time, not the actual time to repair. This can also be referred to as "replace" or "recover".
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