Good afternoon,

after rebooting all the VMs, the CPU load of the engine is ok now.

I think this high CPU usage is coming from this new feature, that you see on a VM with orange triangle, what will be changed after power cycle.
Actually, this is a nice feature, but it brings down an engine, when all VMs need a reboot. After an upgrade for example.

Is there a possibility to avoid this? How should I upgrade an oVirt environment with 1000s of VMs? The engine would be unusable.

BR Florian


Von: "Florian Schmid" <fschmid@ubimet.com>
An: "users" <users@ovirt.org>
Gesendet: Freitag, 7. Februar 2020 08:13:05
Betreff: [ovirt-users] Re: Huge increase of CPU load on hosted engine VM after upgrade to 4.3.8 and cluster compatibility version

Hi,

no, fortunately, the bug didn't came back.

It looks like, that the engine needs its time to settle after changing the cluster compatibility version. After about 2 hours, the CPU load was as low as before.
The time to load the VM UI takes a little bit more time, but I think this is also normal, because all VMs still have the orange triangle and need a reboot.

Sorry for the false positive, but I was really afraid about the high load.

BR Florian

Von: "p staniforth" <P.Staniforth@leedsbeckett.ac.uk>
An: "Florian Schmid" <fschmid@ubimet.com>, "users" <users@ovirt.org>
Gesendet: Donnerstag, 6. Februar 2020 18:22:51
Betreff: Re: Huge increase of CPU load on hosted engine VM after upgrade to 4.3.8 and cluster compatibility version

Has this bug come back

engine.log flooded with "Field 'foo' can not be updated when status is 'Up'"

https://lists.ovirt.org/archives/list/users@ovirt.org/thread/MKFQRCKHRT6NJUHF7URJTQG753MND6PJ/?sort=date

Regards,

Paul S.
From: Florian Schmid <fschmid@ubimet.com>
Sent: 06 February 2020 15:53
To: users <users@ovirt.org>
Subject: [ovirt-users] Huge increase of CPU load on hosted engine VM after upgrade to 4.3.8 and cluster compatibility version
 
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Hi,

I have upgraded yesterday one of our ovirt environments from 4.2.8 to 4.3.8.
We have a hosted engine, 25 hosts and about 150 VMs running there.

After upgrading the cluster compatibility version from 4.2 to 4.3, I have seen a huge increase of CPU load on the engine VM.
The engine had 4 cores (16GB mem) and never had load issues, but after the upgrade, the system has a load of 6 and more. I have increased the CPUs to 8, because working in the UI was impossible.

I have noticed, that the load always increase, when I load the VM UI tab, where now all VMs have the orange triangle with pending changes: Custom compatibility version

The problem I have, is, that I can't reboot now all VMs, maybe in the next 3 or 4 weeks.
Working now with the UI is quite problematic, because of the slowness.

The engine VM was already rebooted, but didn't solve the problem.

What logs do you need and is there a workaround available? I have some more oVirt environments to upgrade, all with even more VMs.

BR Florian
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