[CentOS] Slow NFS writes

Craig White craigwhite at azapple.com
Mon Oct 20 17:49:16 UTC 2008

On Mon, 2008-10-20 at 13:21 -0400, Joshua Baker-LePain wrote:
> On Sat, 18 Oct 2008 at 11:21pm, Craig White wrote
> > Server, CentOS 5.2 and updated earlier today, just installed a week ago.
> >
> > Client, Macintosh G4, OS X 10.4.11
> *snip*
> > Copy To     Win2K       AFP         SMB       NFS
> >          1m40.053s   0m22.566s  0m23.817s  2m11.849s
> >
> > Copy From   Win2K       AFP         SMB       NFS
> > 	1m34.478s   0m20.709s  0m20.823s  0m23.487s
> >
> Do you have any Linux clients to test with?  That way you could determine 
> whether the problem is on the server or the client side.  ISTR hearing bad 
> things about Apple's NFS implementation (shocking, I know).  You also want 
> to test with larger files (at least 2x RAM of the server or client, 
> whichever is larger) to make sure you're not just seeing cache effects.
I was using a 648 Gb 'PSD' file which surely is beyond caching.

You definitely were correct in your assertion and stupid me should have
tested it from another Linux box.

$ time cp BackgroundGraphic.psd /home/filesystems/srv-adv/

real    0m18.547s
user    0m0.015s
sys     0m3.306s

so the problem isn't NFS slow writes...it's slow NFS writes from
Macintosh client  ;-(

I'll play around a bit more but it's clear that no matter what I do, NFS
writes will never be faster than AFP or SMB from a Macintosh so given
the extra pain of setup, it's never going to happen.



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