[Sheepdog] Sheepdog performance

Haven haven at thehavennet.org.uk
Tue Apr 5 15:34:06 CEST 2011

Disabling barriers helps with writes at the expense of loss of data
security in the case of a power failure. For testing I'd say its
definitely worth a play but probably not in a production environment.

I don't have any numbers to hand on the differences unfortuantely -
its just something I use on my test systems fairly generically these
days. So far I've not had any bad experiences using it.

On 04/05/11 14:07, 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?
> Cheers,
> Chris.

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