Hello
We've a cluster under Sun Grid Engine with a data NFS server and we've
some performance problems on the server (it seems this is IO problems).
It seems we've also many,many smalls UDP packets between the node and the
NFS server (5000 packet in 10 seconds...)
#tcpdump -v host server
18:13:26.212996 IP (tos 0x0, ttl 64, id 54076, offset 0, flags [DF],
length: 140) server.nfs > n46.797: UDP, length: 112
18:13:26.213459 IP (tos 0x0, ttl 64, id 42208, offset 0, flags [DF],
length: 140) n46.797 > server.nfs: UDP, length: 112
Actually i've no more idea about the performance problems. NFS which block
IO ? How could i get more information about this network trafic ?
The data partition is mounted with noatime option.
Any clue ?
thanks
cc
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Christophe Caron - INRA
Mathematique, Informatique et Genome
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On Tue, 2006-04-25 at 18:20 +0200, [email protected] wrote:
> Actually i've no more idea about the performance problems. NFS which block
> IO ? How could i get more information about this network trafic ?
Capture the data in binary format (tcpdump can do this with the -w
option, though you may need to increase the snarflen with -s) and then
have a look at it with a packet analyzer (such as ethereal).
-- Jeff
-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
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