Quote: "Downtime consists of two elements, the systems recovery time and the work recovery time. Therefore, MTD = RTO + WRT."
Quote: "Work recovery time (WRT). [...] It takes time to get critical business functions back up and running once the systems (hardware, software, and configuration) are restored. Upstream and downstream systems or interfaces need to be synchronized, data need to be tested to ensure backups are correct and in sequence, data captured manually during a downtime needs to be input, validated, and integrated into existing data. This is an area that some planners overlook, especially from IT. If the systems are back up and running, they’re all set from an IT perspective. From a business function perspective, there are additional steps that must be undertaken before it’s back to business."
Source: Business Impact Analysis
Susan Snedaker, Chris Rima, in Business Continuity and Disaster Recovery Planning for IT Professionals (Second Edition), 2014
Correct, according to the CISSP exam objectives, the formula to determine the Maximum Tolerable Downtime (MTD) is the Recovery Time Objective (RTO) + Work Recovery Time (WRT). The RTO is the maximum length of time that a business process can be unavailable before it begins to have an impact on the business, while the WRT is the time required to restore the business process to its normal state after an incident occurs. Together, these two factors help to determine the maximum amount of time that a business can tolerate being without a particular process before it begins to suffer significant consequences.
Maximum allowable downtime = RTO + WRT
For example, if a critical business process has a three-day maximum allowable downtime, the RTO for systems, networks and data might be one day. This is the time the organization needs to recover technology. The remaining two days are for work recovery.
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