[K12OSN] CPU or Memory
bmabbott at riverdale.k12.or.us
Tue Sep 28 16:19:10 UTC 2004
Liam Marshall wrote:
> Question. Will getting a Gig switch that the server will plug into,
> along with a line from the other 10/100 switches do anything? I mean,
> if only the server has Gig nic, what good would it accomplish if I
> cannot afford to put gig switches and nics everywhere? I have truly
> blown the budget for this year. I might be able to squeeze out a
> small gig switch, but what good is it?
It makes a big difference for graphics intensive apps like Tux Type.
Each session of an app like that is going to use somewhere in the
neighborhood of 70mbit. If the server only has a 100mbit connection to
the switch, just one user running Tux Type will eat up almost all of the
server's upstream bandwidth. Gigabit to the switch gives the server a
lot more bandwidth, and thus it can handle more sessions of an app like
that without slowing to a crawl.
The clients themselves don't need gigabit because they're not going to
be using more than 100mbit. If you have 10 clients running Tux Type, the
server needs up to 700mbit to keep up with the load, but each client is
only using 70mbit, so a 100mbit connection is more than enough. The pipe
to a client only needs to be able to handle the traffic going to that
one client, the pipe to the server needs to be able to handle the
traffic going to *every* client. Apps like Tux Type are an extreme
example, but every program that a client is running is using some
bandwidth, and with a lab of 30 clients it can max out a 100mbit
connection pretty quick. Gigabit between the server and the switch is
always a good idea if you have the option.
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