Han Chuan Alex Ang wrote: > > hi, I am trying to plan for disaster recovery and the data that > are to be backup will be transfer between a 3548 switch via a > gigabit link to Core 6006 as well as to a backup server via > gigabit link, therefore , data will be passing through a Fast > Ethernet and 1 gigabits pipe line with back plane of 10.8 Gbps > for 3548 and 6006 with 32 Gbps. Wonder if any body there who > could shed some light as to any website or way to go about > doing this capacity planning.What are the factor to take note > and how do we calculate.thank
Capacity planning works best with real application-layer data that takes into account client/server (or server/server) transaction behavior. In other words, you should try it first and measure how much bandwidth actually gets used. Put a protocol analyzer on the network and make some measurements. Investigate things like packet size, packet turnaround time, efficiency, how much bandwidth is used by lower-layers in addition to the application layer, etc. Then you can pose "what if" questions such as what if the capacity were increased by 10 fold or if the switches were faster, etc. Simulation packages can help you do this. Sometimes you can get a good idea by just doing some basic calculations also. But, bottom line, you should start with some real-world data about the application. Unless you are the programmer who wrote the application and have a lot of theoretical knowledge about how it behaves, then you should gather the data empirically. (Actually programmers rarely really understand how their programs behave on a network, so still I would say, do some measurements.) Priscilla Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62521&t=62492 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
