95th Percentile Bandwidth Billing
1. 95th Percentile Bandwidth Rule
Bandwidth is measured from the switch and recorded in a log file. In most cases, this is done every 5 minutes. At the end of the month, the samples are sorted from highest to lowest, and the top 5% (which equal to approximately 36 hours of a 30-day billing cycle) of data is ignored. The next highest measurement becomes the billable usage for the month.
There are 288(60min/5*24hr) bandwidth spots of 5 minutes in one day. Assuming there are 30 days in a month, there will be 8640(288*30) bandwidth spots of 5 minutes in a month.
- Sorting the above 8640 bandwidth spots from largest to smallest.
- 8640 * 5% = 432, this top 5% of bandwidth spots shall be discarded.
- 8640 – 432 = 8208, the highest usage value of remaining 8208 bandwidth spots shall be billable for the month.