[ovirt-users] Performance of cloning

[Nir Soffer]

On Thu, Sep 28, 2017 at 1:39 PM Gianluca Cecchi <gianluca.cecchi at gmail.com>
wrote:

> On Thu, Sep 28, 2017 at 11:02 AM, Gianluca Cecchi <
> gianluca.cecchi at gmail.com> wrote:
>
>> Hello,
>> I'm on 4.1.5 and I'm cloning a snapshot of a VM with 3 disks for a total
>> of about 200Gb to copy
>> The target I choose is on a different domain than the source one.
>> They are both FC storage domains, with the source on SSD disks and the
>> target on SAS disks.
>>
>> The disks are preallocated
>>
>> Now I have 3 processes of kind:
>> /usr/bin/qemu-img convert -p -t none -T none -f raw
>> /rhev/data-center/59b7af54-0155-01c2-0248-000000000195/fad05d79-254d-4f40-8201-360757128ede/images/8f62600a-057d-4d59-9655-631f080a73f6/21a8812f-6a89-4015-a79e-150d7e202450
>> -O raw
>> /rhev/data-center/mnt/blockSD/6911716c-aa99-4750-a7fe-f83675a2d676/images/c3973d1b-a168-4ec5-8c1a-630cfc4b66c4/27980581-5935-4b23-989a-4811f80956ca
>>
>> but despite capabilities it seems it is copying using very low system
>> resources.
>>
>> [snip]
>
>>
>> Is it expected? Any way to speed up the process?
>>
>> Thanks,
>> Gianluca
>>
>
> The cloning process elapsed was 101'
> The 3 disks are 85Gb, 20Gb and 80Gb so at the end an average of 30MB/s
>
At this moment I have only one host with self hosted engine VM running in
> this environment, planning to add another host in short time.
> So not yet configured power mgmt for fencing on it
> During the cloning I saw these kind of events
>
> Sep 28, 2017 10:31:30 AM VM vmclone1 creation was initiated by
> admin at internal-authz.
> Sep 28, 2017 11:16:38 AM VDSM command SetVolumeDescriptionVDS failed:
> Message timeout which can be caused by communication issues
>
> Sep 28, 2017 11:19:43 AM VDSM command SetVolumeDescriptionVDS failed:
> Message timeout which can be caused by communication issues
>

This looks like timeout on vdsm side, you can find more info in vdsm log
about these errors.


> Sep 28, 2017 11:19:43 AM Failed to update OVF disks
> 1504a878-4fe2-40df-a88f-6f073be0bd7b, 4ddac3ed-2bb9-485c-bf57-1750ac1fd761,
> OVF data isn't updated on those OVF stores (Data Center DC1, Storage Domain
> SDTEST).
>

Same


> At 11:24 I then start a pre-existing VM named benchvm and run a cpu / I/O
> benchmark (HammerDB with 13 concurrent users; the VM is configured with 12
> vcpus (1:6:2) and 64Gb of ram; it is not the one I'm cloning) that runs
> from 11:40 to 12:02
> Sep 28, 2017 11:24:29 AM VM benchvm started on Host host1
> Sep 28, 2017 11:45:18 AM Host host1 is not responding. Host cannot be
> fenced automatically because power management for the host is disabled.
>

Same


> Sep 28, 2017 11:45:28 AM Failed to update OVF disks
> 1504a878-4fe2-40df-a88f-6f073be0bd7b, 4ddac3ed-2bb9-485c-bf57-1750ac1fd761,
> OVF data isn't updated on those OVF stores (Data Center DC1, Storage Domain
> SDTEST).
>

Same


> Sep 28, 2017 11:45:39 AM Status of host host1 was set to Up.
> Sep 28, 2017 12:12:31 PM VM vmclone1 creation has been completed.
>
> Any hint on the failures detected, both when only the cloning process was
> in place and when a bench was running inside a VM?
>

I would check the host logs (vdsm and messages).


>
> Thanks,
> Gianluca
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