🚀 go-pugleaf

WEILL Philippe (philippe.weill@aero.jussieu.fr) wrote:
> I wrote:
> > Linux Client READ from OSF1 Server : ~350Ko/s
> > Linux Client Write to  OSF1 Server : ~30Ko/s
> >                                      ^^^^^^^
> > ftp linux to osf1 the same file    : ~900Ko/s
> >
> > Have you any advice to improve NFS write performance from linux to OSF1
> >
> using mount option size=8192 wsize=8192 is better
> Linux Client READ from OSF1 Server : ~400Ko/s
> Linux Client Write to  OSF1 Server : ~150Ko/s
>                                      ^^^^^^^
> 
> Do you know  if it's possible to have better results or if it's the maximun
> with the actual version of NFS Client for linux? 

This standard answer is right and wrong!

If you write tiny little blocks (e.g. GNU as) you get always a very low 
write performance (try iozone).

We had the same problems some times ago with HP-UX machines. Our solution
was in the exports man-page under export options:

           async     Specifying async increases write performance on the NFS
                     server by causing asynchronous writes on the NFS
                     server.  The async option can be specified anywhere on
                     the command line after the file system name.

Setting this option our write performance rises from 20-30K to 300-400K for all
blocksizes.
But the problem is, that i don't find this option in the OSF exports man-page.
The default setting for the OSF server seems to be snyc-write. But, there MUST
be a way set async writes! Please mail me if you solve this problem.

jh


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