Availability, MTTR, Massive problem

1. Prepared by
INS Saputra
CCNA | CCNP | MTI
ins.saputra@gmail.com

2. Page 2 of 11
CURRENT CUSTOMER’S NEEDS










 .
HIGH
AVAILABILITY

3. Page 3 of 11
AVAILABILITY
(Agreed Service Time (AST) – Downtime)
Agreed Service Time (AST)
X 100 %Availability (%) =

4. Page 4 of 11
MTTR
Total downtime in hours
Number of failure
Maintainability (MTRS in hours) =

5. Page 5 of 11
AVAILABILITY vs MTTR

6. Page 6 of 11
MASSIVE PROBLEM (1)
•
•







7. Page 7 of 11
MASSIVE PROBLEM (2)
•
Number of site Permitted Downtime per month
1 3h 36m
•
• So, what is the right formula to calculate
permitted downtime for massive problem?

8. Page 8 of 11
MASSIVE PROBLEM (3)
•
2 99.75% 1h 48m 8s
3 99.83% 1h 12m 7s
4 99.87% 0h 54m 6s
5 99.90% 0h 43m 17s
: : :
10 99.95% 0h 21m 39s

9. Page 9 of 11
HOW TO REDUCE MTTR?

•
•
•
•
•
•

10. Page 10 of 11
INCIDENT LIFECYCLE

11. Page 11 of 11