Re: NFS Help! Terrible performance with sync, fast performance with async

On 11/21/06, Stephen John Smoogen <[email protected]> wrote:

>
> To be honest, this may be a place where Linux is just going to suck.
> The NFS server stuff has a lot of issues to deal with.. and reading
> http://nfsworld.blogspot.com/ (which I am guessing is from Sun ) there
> are a lot of places where it hasnt been optimized.
>

-ENOCAFFEINE

http://nfsworld.blogspot.com/ is from someone who has worked on NFS
for a long time

http://blogs.sun.com/erickustarz/ is from someone at sun

http://nfs.sourceforge.net/

>From the faq..
Does your application open its files with the O_SYNC option? That will
force NFS Version 3 to behave exactly like (synchronous) NFS Version
2.

I think bonnie++ and cp do this unless told otherwise.. which could be
why they bog down without sync. If the mention in the nfsworld blog
are correct about file timeing.. this could also cause problems with
any Linux NFS v2/v3 server. It would be interesting what the iozone
comparisons between v2/v3/v4 would be.




-- 
Stephen J Smoogen. -- CSIRT/Linux System Administrator
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"

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