[ovirt-users] Live merge speed

[Maor Lipchuk]

Hi Markus,

Can you try to use dd on a random file in that storage domain, What is the
performance it reflects?
Just want to make sure what is the origin of the problem, if  it is related
to the storage domain or the qemu process.

Regards,
Maor

On Thu, Nov 3, 2016 at 8:09 PM, Markus Stockhausen <stockhausen at collogia.de>
wrote:

> Hi there,
>
> in the past we already observed that live merge operations may take some
> time.
> Currently another of those operations is running on one of our VMs on a
> CentOS 7/qemu 2.3 node. Storage is (async - yeah I know about potential
> data
> loss) NFS over 10GBit network.
>
> The operation is running for 50 minutes now with an average throughput of
> 5MByte/sec. The disk (defined at 400GB) and its snapshots does not show
> much
> thin provisioning:
>
> ls -al
> -rw-rw----.   1 vdsm kvm 429496729600  7. Apr 2016
> a204865e-ef57-41e0-a2ac-465a6c9c3d60
> -rw-rw----.   1 vdsm kvm 203334418432  3. Nov 2016
> aeda833f-1f4b-4b6f-b553-578f1f3f06ee
> -rw-rw----.   1 vdsm kvm 192091389952  3. Nov 2016
> c8acdbc7-af24-4c5c-94c5-ae7262d98f5c
>
> du -m a204865e-ef57-41e0-a2ac-465a6c9c3d60
> 383070  a204865e-ef57-41e0-a2ac-465a6c9c3d60
> du -m aeda833f-1f4b-4b6f-b553-578f1f3f06ee
> 193953  aeda833f-1f4b-4b6f-b553-578f1f3f06ee
> du -m c8acdbc7-af24-4c5c-94c5-ae7262d98f5c
> 183222  c8acdbc7-af24-4c5c-94c5-ae7262d98f5c
>
> Usually at some point the process is gaining speed and we see >100MByte/sec
> speed. Can anyone explain what might be going on.
>
> Best regards.
>
> Markus Stockhausen
>
>
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