Which factor is a measurement of system reliability?

Question

Exhibit

Options

• ARecovery point objective
• BMean time between failures
• CMean time to repair
• DRecovery time objective

• A
  14% (6)
• B
  71% (30)
• C
  10% (4)
• D
  5% (2)

Explanation

Measuring Information Availability Information availability relies on the availability of both physical and virtual components of a data center. Failure of these components might disrupt information availability. A failure is the termination of a component's ability to perform a required function. The component's ability can be restored by performing an external corrective actions, such as a manual reboot, a repair, or replacement of the failed component(s). Proactive risk analysis, performed as part of the BC planning process, considers the component failure rate and average repair time, which are measured by MTBF and MTTR: Mean Time Between Failure (MTBF): It is the average time available for a system or component to perform its normal operations between failures. It is the measure of system or component reliability and is usually expressed in hours. Mean Time To Repair (MTTR): It is the average time required to repair a failed component. MTTR includes the total time required to do the following activities: detect the fault, mobilize the maintenance team, diagnose the fault, obtain the spare parts, repair, test, and restore the data. MTTR is calculated as: Total downtime/Number of failures IA can be expressed in terms of system uptime and downtime and measured as the amount or percentage of system uptime: IA = system uptime / (system uptime + system downtime) Where system uptime is the period of time during which the system is in an accessible state; when it is not accessible, it is termed as system downtime. In terms of MTBF and MTTR, IA could also be expressed as: IA = MTBF / (MTBF + MTTR)

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