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Managed Block Storage and Templates
by Shantur Rathore 28 Sep '21

28 Sep '21

Hi all, Anyone tried using Templates with Managed Block Storage? I created a VM on MBS and then took a snapshot. This worked but as soon as I created a Template from snapshot, the template got created but there is no disk attached to the template. Anyone seeing something similar? Thanks

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Managed Block Storage issues
by Shantur Rathore 28 Sep '21

28 Sep '21

Hi all, I am trying to set up Managed block storage and have the following issues. My setup: Latest oVirt Node NG : 4.4.8 Latest oVirt Engine : 4.4.8 1. Unable to copy to iSCSI based block storage I created a MBS with Synology UC3200 as a backend ( supported by Cinderlib ). It was created fine but when I try to copy disks to it, it fails. Upon looking at the logs from SPM, I found "qemu-img" failed with an error that it cannot open "/dev/mapper/xxxxxxxxxx" : Permission Error. Had a look through the code and digging out more, I saw that a. Sometimes /dev/mapper/xxxx symlink isn't created ( log attached ) b. The ownership to /dev/mapper/xxxxxx and /dev/dm-xx for the new device always stays at root:root I added a udev rule ACTION=="add|change", ENV{DM_UUID}=="mpath-*", GROUP="qemu", OWNER="vdsm", MODE="0660" and the disk copied correctly when /dev/mapper/xxxxx got created. 2. Copy progress finishes in UI very early than the actual qemu-img process. The UI shows the Copy process is completed successfully but it's actually still copying the image. This happens both for ceph and iscsi based mbs. Is there any known workaround to get iSCSI MBS working? Kind regards, Shantur

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oVirt / Hyperconverged
by topoigerm＠gmail.com 28 Sep '21

28 Sep '21

I have 4 servers of identical hardware. The documentation says "you need 3", not "you need 3 or more"; is it possible to run hyperconverged with 4 servers. Currently all the 4 nodes server has been crashed n after the 4th node try joining the hyperconverged 3nodes cluster. Kindly advise. FYI currently i'm trying to reinstall back all the OS back due mentioned incident happen. /BR Faizal

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Re: [ovirt-announce] Re: oVirt 4.4.8 Async update #4
by Marina Kalinin 28 Sep '21

28 Sep '21

Hi Diggy, If you have updated to oVirt 4.4.8 prior to 4.4.8.6 async release, it means your system got impacted. To fix it, you need to set some value to HEVM timezone and then try again (at least how I understand it). Regards, Marina. On Sun, Sep 26, 2021 at 3:00 PM Diggy Mc <d03(a)bornfree.org> wrote: > I'm not sure you fixed the compatibility version problem. I upgraded the > HE to 4.4.8.6 and rebooted it. Still cannot upgrade compatibility. > _______________________________________________ > Announce mailing list -- announce(a)ovirt.org > To unsubscribe send an email to announce-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/privacy-policy.html > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/announce@ovirt.org/message/IKNF4V6MT5… >

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about the Live Storage Migration
by Tommy Sway 27 Sep '21

27 Sep '21

From the document: Overview of Live Storage Migration Virtual disks can be migrated from one storage domain to another while the virtual machine to which they are attached is running. This is referred to as live storage migration. When a disk attached to a running virtual machine is migrated, a snapshot of that disk's image chain is created in the source storage domain, and the entire image chain is replicated in the destination storage domain. As such, ensure that you have sufficient storage space in both the source storage domain and the destination storage domain to host both the disk image chain and the snapshot. A new snapshot is created on each live storage migration attempt, even when the migration fails. Consider the following when using live storage migration: You can live migrate multiple disks at one time. Multiple disks for the same virtual machine can reside across more than one storage domain, but the image chain for each disk must reside on a single storage domain. You can live migrate disks between any two storage domains in the same data center. You cannot live migrate direct LUN hard disk images or disks marked as shareable. But where do users perform online storage migrations? There seems to be no interface.

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Re: About the vm memory limit
by Tommy Sway 27 Sep '21

27 Sep '21

In fact, I am very interested in the part you mentioned, because my environment is running relational database, which usually requires a large amount of memory, and some systems clearly need to configure HUGEPAGE memory (such as Oracle). Could you elaborate on some technical details about the management of huge page memory? And the difference between 4.3 and 4.4 in this respect? Thank you very much! From: Strahil Nikolov <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PM To: Tommy Sway <sz_cuitao(a)163.com> Subject: Re: [ovirt-users] About the vm memory limit It depends on the numa configuration of the host. If you have 256G per CPU, it's best to stay into that range. Also, consider disabling transparent huge pages on the host & VM. Since 4.4 Regular Huge Pages (do not confuse them with THP) can be used on the Hypervisors, while on 4.3 there were some issues but I can't provode any details. Best Regards, Strahil Nikolov On Fri, Sep 24, 2021 at 6:40, Tommy Sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote: I would like to ask if there is any limit on the memory size of virtual machines, or performance curve or something like that? As long as there is memory on the physical machine, the more virtual machines the better? In our usage scenario, there are many virtual machines with databases, and their memory varies greatly. For some virtual machines, 4G memory is enough, while for some virtual machines, 64GB memory is needed. I want to know what is the best use of memory for a virtual machine, since the virtual machine is just a QEMU emulation process on a physical machine, and I worry that it is not using as much memory as a physical machine. Understand this so that we can develop guidelines for optimal memory usage scenarios for virtual machines. Thank you! _______________________________________________ Users mailing list -- users(a)ovirt.org <mailto:users@ovirt.org> To unsubscribe send an email to users-leave(a)ovirt.org <mailto:users-leave@ovirt.org> Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIMKCP4JE…

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Re: why cannot set the power management proxy server ?
by Tommy Sway 27 Sep '21

27 Sep '21

I set lanplus=1, and then it ok. What’s meaning of it ? From: Strahil Nikolov <hunter86_bg(a)yahoo.com> Sent: Friday, September 24, 2021 3:13 AM To: Tommy Sway <sz_cuitao(a)163.com> Subject: Re: [ovirt-users] why cannot set the power management proxy server ? Try adding 'lanplus=0' into the options. Best Regards, Strahil Nikolov On Thu, Sep 23, 2021 at 5:59, Tommy Sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote: I can use ipmitool to send commands from any KVM host to other hosts in the same cluster. However, an internal error is reported when CONFIGURING power proxy on engine. How can I locate the fault? _______________________________________________ Users mailing list -- users(a)ovirt.org <mailto:users@ovirt.org> To unsubscribe send an email to users-leave(a)ovirt.org <mailto:users-leave@ovirt.org> Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/62XDSQNJTOPRK…

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Hypervisor broken
by Hans Scheffers 27 Sep '21

27 Sep '21

Hi all, I am new here, been searching the mailing list on a regular base when I encountered problems and till now I always was able to keep the system up & running. As said... till now... I have oVirt at home, and I have about 7 vm's running on it. Lately I have had some troubles with my electricity, which results in a complete power outage on a irregular base. Yesterday I had a power outage which left the system unbootable with the following errors: error: ../../grub-core/loader/i386/pc/linux.c:170:invalid magic number. error: ../../grub-core/loader/i386/pc/linux.c:1418:you need to load the kernel first. Press any key to continue Normally this can be solved following https://access.redhat.com/solutions/5829141, but his time also the files in /boot had a size of 0 bytes. So basically i did not have a working kernel on the system anymore. https://www.thegeekdiary.com/centos-rhel-7-how-to-install-kernel-from-res... does work for CentOS 8 also, but the ovirt 4.8 iso does not have the same directory structure. Using CentOS 8 installs a kernel, but not a bootable system. When booting the ovirt kernel, I get a rescue prompt with the following error: "Warning: /dev/onn/ovirt-node-ng-4.4.6.3-0.20210518.0+1 does not exist" Is there a way i can start the installer in troubleshooting mode so I can do a reinstall and keep the current configuration or can I just reinstall and import the current datacenter in it?

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Hosted Engine cluster version compatib.
by Andrea Chierici 24 Sep '21

24 Sep '21

Dear all, I have just updated my ovirt installation, with self hosted engine, from 4.4.5 to 4.4.8.5-1. Everything went smoothly and in a few minutes the system was back up and running. A little issue is still puzzling me. I am asked to update from 4.5 to 4.6 the cluster and data center compatibility level. When I try to issue the command from the cluster config I get this error: > Error while executing action: Cannot update cluster because the update > triggered update of the VMs/Templates and it failed for the following: > HostedEngine. To fix the issue, please go to each of them, edit, > change the Custom Compatibility Version (or other fields changed > previously in the cluster dialog) and press OK. If the save does not > pass, fix the dialog validation. After successful cluster update, you > can revert your Custom Compatibility Version change (or other > changes). If the problem still persists, you may refer to the > engine.log file for further details. It's very strange because the config of the hostedengine is "plain" and there are no constrains on compatibility version, as you can see in this picture: In any case, if I try to force compatibility with 4.6 I get this error: > Error while executing action: > > HostedEngine: > > There was an attempt to change Hosted Engine VM values that are > locked. So I am stuck. Not a big deal at the moment, but sooner or later I will have to do this upgrade and I don't know where I am wrong. Can anybody give a clue? Thanks in advance, Andrea -- Andrea Chierici - INFN-CNAF Viale Berti Pichat 6/2, 40127 BOLOGNA Office Tel: +39 051 2095463 SkypeID ataruz --

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Ooops! in last step of Hyperconverged deployment
by Harry O 24 Sep '21

24 Sep '21

Hi, In the second engine dep run in Hyperconverged deployment I get red "Ooops!" in cockpit. I think it fails on some networking setup. The first oVirt Node says "Hosted Engine is up!" but the other nodes is not added to HostedEngine yet. There is no network connectivity to the Engine outside node1, I can ssh to engine from node1 on the right IP-address. Please tell what logs I should pull.

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