NFS slow

[Ivan Voras]

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?

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