a recent isp issued caused me to remember just exactly what “uptime” means...here's a little taste:
| guarantee % |
allowable downtime annually |
| 99.9999 |
holy crap < 1 minute (six sigma) |
| 99.999 |
5.2 minutes (famous "5 nines") |
| 99.99 |
52.5 minutes |
| 99.9 |
525.6 minutes (8.76 hours) |
| 99 |
5256 minutes (87.6 hours) |
| if you are "lucky" to have a provider giving you a 90% guarantee, congrats, you could be down for an acceptable 36.5 days per year |