I have migrated KVM VMs from a CentOS 6 to a CentOS 7 host. All work fine post-migration, CentOS 3 (don't ask ...), CentOS 6, CentOS 7, Windows. But the CentOS 5 VMs failed. At some point during the boot process, they became unpingable and also inaccessible. I have correlated this to the start of the irqbalance service and was wondering if it is generally considered best practice to turn it off. The VMs in question all have at least 2 vcpus, and the C5 VMs are the odd ones out.
migrated or moved? I move vm from C6 to C7 without any problem, C5 guests too. - copy disk files (rsync or scp) - create in virtual manager - change HWADDR in nic start guest Viele Gr??e Helmut Drodofsky Internet XS Service GmbH He?br?hlstra?e 15 70565 Stuttgart Gesch?ftsf?hrung Helmut Drodofsky HRB 21091 Stuttgart USt.ID: DE190582774 Fon: 0711 781941 0 <tel:+497117819410> Fax: 0711 781941 79 Mail: info at internet-xs.de www.internet-xs.de Am 24.04.2020 um 11:53 schrieb isdtor:> I have migrated KVM VMs from a CentOS 6 to a CentOS 7 host. All work fine post-migration, CentOS 3 (don't ask ...), CentOS 6, CentOS 7, Windows. But the CentOS 5 VMs failed. At some point during the boot process, they became unpingable and also inaccessible. > > I have correlated this to the start of the irqbalance service and was wondering if it is generally considered best practice to turn it off. The VMs in question all have at least 2 vcpus, and the C5 VMs are the odd ones out. > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > https://lists.centos.org/mailman/listinfo/centos-virt-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20200424/5e7072f3/attachment-0005.html>
Helmut Drodofsky writes:> migrated or moved? I move vm from C6 to C7 without any problem, C5 > guests too. > > - copy disk files (rsync or scp) > - create in virtual manager > - change HWADDR in nic > > start guestMoved. Just like you, minus the MAC change.
I may have run into this issue before too, but in my case the VMs ran fine with only 1 vcpu so I booted them that way and left them like that. It was just a few small legacy VMs and I didn't spend any more time on it. Did you try booting with only 1 vcpu? Chris -- Chris?Wik Anu?Internet?Services www.anu.net?|?www.cwik.ch From: isdtor <isdtor at gmail.com> To: <centos-virt at centos.org> Sent: 24/04/2020 11:53 AM Subject: [CentOS-virt] VM migration problems I have migrated KVM VMs from a CentOS 6 to a CentOS 7 host. All work fine post-migration, CentOS 3 (don't ask ...), CentOS 6, CentOS 7, Windows. But the CentOS 5 VMs failed. At some point during the boot process, they became unpingable and also inaccessible. I have correlated this to the start of the irqbalance service and was wondering if it is generally considered best practice to turn it off. The VMs in question all have at least 2 vcpus, and the C5 VMs are the odd ones out. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20200424/0dbc0e45/attachment-0005.html>
Chris Wik writes:> > I may have run into this issue before too, but in my case the VMs ran fine with only 1 vcpu so I booted them that way and left them like that. It was just a few small legacy VMs and I didn't spend any more time on it. > > Did you try booting with only 1 vcpu?Yes, and it works. Good to know but I was really looking for some sort of technical explanation.