[Sheepdog] Sheepdog performance

[Chris Webb]

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?

Cheers,

Chris.