NFS performance problem

NFS performance problem

Post by Johan De Wi » Thu, 21 Sep 2000 04:00:00

Hi all,

Seems nfs has a problem with us :

Saving a file on a nfs mounted FS, takes much longer than saving on local disk.  (10 times longer).

tried to install nfswatch, but no success.  Anyone knows of a good diagnose tool for 2.6 to monitor the nfs traffic ??

Pitty I don't have root access to the nfsserver (only one machine), but sunce the official admins are all in holiday, and are not responding to our perfermance problems, I will try to indicate the cause myself.



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1. NFS Performance problems under AIX 4.2

I am running AIX 4.2 on two RS/6000 590 machines, one of which exports a
volume and the other imports this volume over NFS.  When we were running
AIX 3.251 a 60 Meg file would transfer in about 1min 12sec over NFS on a
FDDI connection.  Now this same transfer takes over 6 minutes on AIX
4.2.  We have tried going from the 4.2 system to an older 3.251 system,
but things are still very slow.  We have several sets of 580/590 test
systems so we set up tests and found that 3251 to 3251 NFS transfers
were quick and anything to/from 4.2 over NFS was slow.  Any ideas?  BTW
an ftp transfer of the same file took about 16 seconds, which goes to
show how inefficient NFS is for this type of transfer.

-Brian Callicott

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