[DRBD-user] Slow NFS behaviour (0.7.5)

Jaroslaw Zachwieja grok at warwick.ac.uk
Tue Nov 23 20:20:50 CET 2004


On wtorek 23 listopada 2004 17:04, Philipp Reisner wrote:
> On Tuesday 23 November 2004 18:02, Philipp Reisner wrote:
> > Do you mount your local filesystems with the "sync" option ?
> > I do not do this. I see this as the common semantics which under
> > Unix/Linux.
>
> I wanted to add: There only way to run a "sync" mounted FS with
> tolerable performance is to use a controller with battery backed-
> up RAM.

I've remounted everything with async option and noticed significant 
performance improvement. Apparently you're right. "sync" is _not_ the 
way to go with DRBD. "async" is.

The loadavg dropped to the manageable range of 2-4 when using both 
protocols B and C and I'm pretty happy with the setup now.

Thanks for the help!

Best regards,
-- 
Jaroslaw Zachwieja
Centre for Scientific Computing
University of Warwick, UK




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