Re: capacity planning question (fwd)

On Fri, 17 Dec 1999, Terence Kelly wrote:

> However I haven't been able to infer from scattered data like this
> the principles that admins apply when deciding how much RAM & disk is
> appropriate for a cache serving a given workload.

A recently suggested rule of thumb is that you want to be able to store 3
- 5 days worth of traffic; if you are serving 1.5 Gb per day, you will
get optimal caching vs cache size by using 5 - 10 Gb of disk storage. This
will then require that you have enough RAM to hold approximately 4 -
800,000 objects, at something 100 bytes per object, i.e. 40 - 80 Mb plus
sundry storage and processes.

I hope my (very) rough figuring isn't too far wide of the mark.

--
 Kendall Lister, Systems Operator for Charon I.S. - kendall@charon.net.au
  Charon Information Services - Friendly, Cheap Melbourne ISP: 9589 7781