December 2017
Beginner
386 pages
9h 16m
English
Content preview from Windows Server 2016 Administration Fundamentals
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High availability
High availability (HA) is a characteristic of a system that never fails, thus being available at all times. However, that is possible only in an ideal world. In our world, the high availability standard is 99.999%. Lately, the standard of 99.9999% has taken its place too (see Table 8.1) in business continuity. To achieve such a standard, it is required to have numerous parameters in place. Thus, from backup to fault tolerance, from resilience to reliability, all storage medias are required to be operational so that the system as a whole is highly available.
Table 8.1. High availability standards
|
Availability (%)
|
Downtime per month
|
Downtime per year
|
| 99 % | 7.20 hours | 3.65 days |
| 99.9 % | 43.2 minutes | 8.76 hours |
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