We are seeing extremely high network traffic from single clients to nfs mounted filers. In most cases running nfswatch on the client shows almost all of the traffic due to "RPC Authorization". We are talking 50-80Mbits of traffic with nothing sticking out on the clients process list. Has anyone seen weird high network traffic via nfs over udp?
thank -tavis
It sounds faintly like this old Linux nfs client bug where the client just pounds the nfs server over and over again, regardless of requests. I usually spotted it by check if the client is an older 2.4 kernel (common package in RedHat7.3). The quick fix is to go to TCP. The longer term is to upgrade your kernel to something a bit more recent.
But that is a linux only thing. And only on older kernels (something like 2.4.9..). If that's not your client, I'd have to know more about what you are seeing.
-Blake
On 11/9/05, Tavis Gustafson tavis@hq.newdream.net wrote:
We are seeing extremely high network traffic from single clients to nfs mounted filers. In most cases running nfswatch on the client shows almost all of the traffic due to "RPC Authorization". We are talking 50-80Mbits of traffic with nothing sticking out on the clients process list. Has anyone seen weird high network traffic via nfs over udp?
thank -tavis
-- ___ /__\ /:/ / /:/__/ /::\ \ /:/:\ \ /__:\ \ :__\ /__/ avis
tavis@hq.newdream.net New Dream Network
Sorry, should have given more info.
Linux kernel 2.4.29 with ontap 6.4.5
Tavis Gustafson wrote:
We are seeing extremely high network traffic from single clients to nfs mounted filers. In most cases running nfswatch on the client shows almost all of the traffic due to "RPC Authorization". We are talking 50-80Mbits of traffic with nothing sticking out on the clients process list. Has anyone seen weird high network traffic via nfs over udp?
thank -tavis
Ok, so that rules that out. What are your mount options? Can you get a quick trace of this? If you use tcpdump, write out to a file, and use a 0 snaplength to make sure you get the rpc section of the packet. Is the problem reproducable, or is it constant?
Did this start after any specific change, or has this always been this way? Can you capture a perfstat?
I'll look at the perfstat for nfsclient and filer nfs server specifics for problems. nfsstat and netstat output for transport or lower layer issues. Well let's start there, and see where that leads us.
-Blake
On 11/9/05, Tavis Gustafson tavis@hq.newdream.net wrote:
Sorry, should have given more info.
Linux kernel 2.4.29 with ontap 6.4.5
Tavis Gustafson wrote:
We are seeing extremely high network traffic from single clients to nfs mounted filers. In most cases running nfswatch on the client shows almost all of the traffic due to "RPC Authorization". We are talking 50-80Mbits of traffic with nothing sticking out on the clients process list. Has anyone seen weird high network traffic via nfs over udp?
thank -tavis
-- ___ /__\ /:/ / /:/__/ /::\ \ /:/:\ \ /__:\ \ :__\ /__/ avis
tavis@hq.newdream.net New Dream Network
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Blake Golliher -
Tavis Gustafson