<div dir="ltr">Hi Markus,<div><br></div><div>Can you try to use dd on a random file in that storage domain, What is the performance it reflects? </div><div>Just want to make sure what is the origin of the problem, if it is related to the storage domain or the qemu process.<br></div><div><br></div><div>Regards,</div><div>Maor</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 3, 2016 at 8:09 PM, Markus Stockhausen <span dir="ltr"><<a href="mailto:stockhausen@collogia.de" target="_blank">stockhausen@collogia.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi there,<br>
<br>
in the past we already observed that live merge operations may take some time.<br>
Currently another of those operations is running on one of our VMs on a<br>
CentOS 7/qemu 2.3 node. Storage is (async - yeah I know about potential data<br>
loss) NFS over 10GBit network.<br>
<br>
The operation is running for 50 minutes now with an average throughput of<br>
5MByte/sec. The disk (defined at 400GB) and its snapshots does not show much<br>
thin provisioning:<br>
<br>
ls -al<br>
-rw-rw----. 1 vdsm kvm 429496729600 7. Apr 2016 a204865e-ef57-41e0-a2ac-<wbr>465a6c9c3d60<br>
-rw-rw----. 1 vdsm kvm 203334418432 3. Nov 2016 aeda833f-1f4b-4b6f-b553-<wbr>578f1f3f06ee<br>
-rw-rw----. 1 vdsm kvm 192091389952 3. Nov 2016 c8acdbc7-af24-4c5c-94c5-<wbr>ae7262d98f5c<br>
<br>
du -m a204865e-ef57-41e0-a2ac-<wbr>465a6c9c3d60<br>
383070 a204865e-ef57-41e0-a2ac-<wbr>465a6c9c3d60<br>
du -m aeda833f-1f4b-4b6f-b553-<wbr>578f1f3f06ee<br>
193953 aeda833f-1f4b-4b6f-b553-<wbr>578f1f3f06ee<br>
du -m c8acdbc7-af24-4c5c-94c5-<wbr>ae7262d98f5c<br>
183222 c8acdbc7-af24-4c5c-94c5-<wbr>ae7262d98f5c<br>
<br>
Usually at some point the process is gaining speed and we see >100MByte/sec<br>
speed. Can anyone explain what might be going on.<br>
<br>
Best regards.<br>
<span class="HOEnZb"><font color="#888888"><br>
Markus Stockhausen<br>
<br>
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<br></blockquote></div><br></div>