View Source: Availability - Waikato Linux Users Group

Edit PageHistory Diff Info LikePages

How much uptime a service has, including scheduled downtime.

Not to be confused with [Reliability] which doesn't include scheduled downtime. For example "Sunlight" is very Reliable (it comes up every day!) but is only about 50% Available (it's dark lots too, but people expect that).

Note, rebooting your machine once a week to get rid of any "issues" that might have cropped up, means your system is very Reliable (assuming no issues actually occur) but not that Available.

|||^__Availability__
|__Percentage__|__"Nines"__|__Time__
| 9% | 1 | Up one month a year
| 99% | 2 | Down 3.65 days a year
| 99.9% | 3 | Down 8.76 hours a year
| 99.99% | 4 | 52.56 minutes per year
| 99.999% | 5 | 5.256 minutes per year
| 99.9999% | 6 | 31.536 seconds per year
| 99.99999% | 7 | 3.1563 seconds per year

2 pages link to Availability:

Reliability
AndrewFileSystem

Last edited on Monday, May 26, 2003 12:22:11 pm by KyleCarter

Edit PageHistory Diff Info LikePages