RE: NFS slow

Jan Catrysse wrote:
Hello all,

I am having some problems with NFS and slow performance.
This is the scenario:

2x FreeBSD 7.1. (Raid storage server, MP, the works)

GB Lan interface between them.

When I transfer 1 big file the speed is never higher than 10MB/s with a
peak
to 14MB/s.

When I transfer multiple files at the same time speed is about 10MB/s per
thread.
Disk speed > 100MB/s

Network speed using samba > 60MB/s (limited by clients disk speed)

Tried enabling NFSlockd, NFSstatd but that changes nothing.

Any help or hunch would be greatly appreciated.

Here are some ideas for testing:

* Any firewall in between them? Do you have network errors?
* Any other network problems, like DNS lookup failures? (not that it
should matter for sustained tranfers but still...)
* Are you using TCP or UDP for NFS? TCP should be better in all cases.
* Have you monitored the system with "top"? Try hitting "S" and "H" in
top while transfering files, see if anything looks suspicious.
* Run "iostat 1", check tps and KB/t.
* What file system are you using?

Hello Ivoras,

NFS TCP did the trick. I tried it already but I didn't properly dismount the
volumes before remounting them on TCP. I did a mount -u -a instead.
Using netstat it became clear NFS was still using UDP. A umount and mount -a
did the trick!

Thnx!
Jan

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