Conference netcad::hub_mgnt

3567.0. "Help needed sizing/configuring network" by KAOFS::S_HYNDMAN (Zoom Splat Pilot) Thu May 30 1996 16:00

	I'm looking for some help determining the proper configuration for the
following network environment.  We are loading software on to pc's and need to
perform this as quickly as possible.  We are using Depea's which we have 
measured as having an effective through put of 0.6Mbps.


	Server----Gigaswitch-------Decswitch----Repeater-----Depea--PC
				   900EF		-----Depea--PC
							-----Depea--PC
							cont.


	Based on 0.6Mbps per pc it would appear that a lan of 15-16 pc's would
saturate an ethernet.   If there were a repeater with 16 pc connected to each
of the DECswitch 900EF ports this would yield 60Mbps.  If we connected two 
DECswitch 900EF's in a ring off a Gigaswitch FGL-2 DAS port then this would 
appear to be max out the FDDI ring.

	Now I know its not this simple.  However I'm getting confused trying 
to determine what I really should be calculating.  Were/how do I apply the
various performance numbers listed to predict what I'll need?

	The DECswitch 900EF lists the following; 
	Maximum packet throughput: 60,000pps
	Maximum filtering rate: FDDI-460.000pps and Ethernet-14880pps
	Max forwarding bandwidth: Forwards at wire speed, 60 Mbps(10*6)

	I'm also trying to get some dates and numbers for the VN900EF as this
with Portswitch modules as this looks like a good solution.  Any other 
approaches welcome.

Scott