Exam SY0-501 topic 1 question 456 discussion

Definition - What does Mean Time To Repair (MTTR) mean? Mean time to repair (MTTR) is a measure of the maintainability of a repairable item, which tells the average time required to repair a specific item or component and return it to working status. It is a basic measure of the maintainability of equipment and parts. This includes the notification time, diagnosis and the time spent on actual repair as well as other activities required before the equipment can be used again. Mean time to repair is also known as mean repair time. https://www.techopedia.com/definition/2719/mean-time-to-repair-mttr

B is correct Mean time between failure (MTBF) - when will you have a failure Mean Time To Restore (MTTR) time to (restore a system to its operational state) Recovery Time Objective (RTO) - how long can you be down Recovery Point Objective (RPO) - what has to be recovered

Mabey the RPO is the operational state

Poorly worded question. RTO is the maximum expected time by which service is expected to be restored, whereas MTTR is the elapsed recovery time averaged over a specified time period I would go with MTTR.

MTTR can tell us how efficient our maintenance team is, exaplmple it measure how fast an Airline ground technicians fix the ground mechanical problem while the passengers are already inside the aircraft the short time is advisable MTBF points to the reliability of our equipment, meaning our equipment is so Strong and never fail easily means it takes more time for the next disaster to seriously inturapt our operations and MTTF tries to estimate the average life meaning if the average life time of our car engine is 500,000 hours and then if we are approaching 400,000 hours the available life time remaining is 100,000 hours so indirectly we are measuring how far we can use our products before preparing

Mean Time to Respond (MTTR) the average time it needs to begin the work associated with a service ticket Mean Time to Repair (MTTR) the average time it takes from the point of detection until the system is fixed Mean Time to Resolve (MTTR) the average time needed to move from the point of detection until the system is fixed and tested to ensure the associated system is working properly Mean Time to Recovery (MTTR) the average time required to go from the point of detection to when the associated system is fully operation

Recovery Point Objective (RPO) is a measure of how frequently you take backups. If a disaster occurs between backups, can you afford to lose five minutes’ worth of data updates? Or five hours? Or a full day? RPO represents how fresh recovered data will be. In practice, the RPO indicates the amount of data (updated or created) that will be lost or need to be reentered after an outage. Recovery Time Objective (RTO) is the amount of downtime a business can tolerate. In a high-frequency transaction environment, seconds of being offline can represent thousands of dollars in lost revenue, while other systems (such as HR databases) can be down for hours without adversely impacting the business. The RTO answers the question, “How long can it take for our system to recover after we were notified of a business disruption?”

Mean Time to Repair (MTTR) is a measure of the time taken to correct a fault so that the system is restored to full operation. This can also be described as mean time to "replace" or "recover." This metric is important in determining the overall Recovery Time Objective (RTO). Reference: COM501B

The key word is "State" instead of "time". So, RPO is the answer.

My take - MTTR is avg time to restore a system RTO is max time taken to restore the system that is acceptable or the time taken from realising a threat/incident occurred until the system was restored Your devices MTTR should not be more than the acceptable RTO for your org

Since the question is not talking about time, RTO is not the answer. Also, question talks about a system so maybe the provided answer is correct. If the question would have mentioned “restore company operations”, could have been RPO Answer B

Question is vague. B “Restore a SYSTEM” – depends on what kind of “system” it is - There are four types of “systems” - product system, service system, enterprise system, and system of systems. MTTR (mean time to repair) measures how long it will take to get a failed product/device running/operating again. RTO (Recovery Time Objective) expected maximum time needed to resume operations of an enterprise system.

Isn't the "expected" time to restore the same as the "average" (mean) time to restore? If I expect it will take 45 minutes it's because that is the average time it usually takes, right?

MTTR is also refered to as mean time to restore, not just mean time to repair. Messer says this himself in his 501 video course on youtube.

Sorry; I meant: B. MTTR

A. how long is it going to take to restore us back to where we were? This would be the mean time to restore, or MTTR.

RTO is the maximum objective time by which service is *expected* to be restored MTTR is the *elapsed* recovery time (an average over a specified time period)