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TCP is your friend. Even if you had Jumbo frames enabled and large
payloads its extremely unlikely that TCP would fail to sufficiently
throttle the delivery rate before you would bump into a hard buffer.
TCP is decoupled from the underlying transports. While this is
inefficient in obvious ways it is also presicely what protects us from
situations like the one you describe. The down side is that TCP doesn't
really get with the program until a problem BEGINS to happen.
GigE on your director will reduce some of the switching burden, but
ultimately, its TCP's behavior which will throttle end-to-end traffic
within the tolerable capacity of your infrastructure.
If top performance is of concern you might consider traffic shaping on
the real servers for egress traffic.
On Mon, 2004-03-29 at 11:46, Jeremy Kusnetz wrote:
> We are planning on upgrading the network our realservers to gigE to
> support a gigE connection to our NFS server. I need to have gigE on the
> realservers due to potential buffering issues losing NFS udp packets
> coming from the NFS server.
>
> Now that the realservers will be on gigE, I can see a potential of the
> realservers sending data to the director faster then the director's
> internal 100mb connection can handle and start buffering packets on the
> swtich. Because of that I'm planning on putting a gigE interface on the
> internal connection of the director, but leaving a 100mb nic connecting
> the director to the outside routers. Now the director would be buffering
> data coming in at gigE speeds and sending out the data at 100mb speeds.
> Am I going to have any problems on the director doing this kind of
> buffering? I figure it could probably handle it better then the switch
> could. Am I right?
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--
Ryan Leathers <ryan.leathers@xxxxxxxxxxxxxxxxxxx>
Global Knowledge
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