[Sheepdog] Sheepdog performance

[MORITA Kazutaka]

At Tue, 5 Apr 2011 14:07:01 +0100,
Chris Webb wrote:
> 
> Haven <haven at thehavennet.org.uk> writes:
> 
> > Running the same test here on the virtual I'm getting:
> > 524288000 bytes (524 MB) copied, 15.2004 s, 34.5 MB/s
> > 
> > Running that on the underlying drive of one of the cluster I get:
> > 524288000 bytes (524 MB) copied, 7.54742 s, 69.5 MB/s
> 
> Yes, that's much more the sort of performance I was seeing in my previous
> tests. I'm expecting some overhead from Sheepdog, but just not quite a
> factor of ten!
> 
> > I'm mounting the sheepdog partition using ext4 on an LVM partition using:
> > noatime,barrier=0,user_xattr,data=writeback
> 
> I will re-test with ext4. Do you find disabling barriers is making a huge
> difference?

I think a barrier option makes a huge difference.


Thanks,

Kazutaka