[ovirt-users] Live merge speed

[Markus Stockhausen]

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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