On 8/8/08, bobby kimble wrote:
> I have the following information for each server:
>
> Avg Kbit/sec usage
> 95th percentile (5min)
>
> Should I total up the Avg Kbit/sec or the 95% to
determine the bandwidth
> requirements?
An average of bandwidth usage would be the same as 50th
percentile
billing, where 50% of the time, if the server had a
bandwidth cap
equal to the average, then packets would not be delayed or
dropped.
95th percentile would mean that 5% of the time, packets
would have
been affected due to bandwidth restrictions.
What I'd do, to support things in a totally "business
case backed with
science and stuff," is calculate one standard deviation
above the
average for each server (would be the same as 84.1%
billing) and
total up all those numbers. If you've got around 3-4
servers, that
should be enough to deal with the peak traffic spikes while
still
using a comfortable amount of the pipe. Then play with the
numbers,
throw darts, and consult your Magic 8-Ball.
--
Jon
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7
&i=132238&t=132233
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