September 2021 - Users - oVirt List Archives

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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how to automatically join AD for windows guest
by wharton wang 24 Sep '21

24 Sep '21

Hi there, anyone could help to tell how to configure sysprep or something on oVirt engine, so it makes vm automatically join active directory . TIA.

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About the vm memory limit
by Tommy Sway 24 Sep '21

24 Sep '21

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!

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about the power management of the hosts
by Tommy Sway 23 Sep '21

23 Sep '21

Everybody, hi: I would like to ask, after the configuration of power management on the host, under what circumstances will work? That is, when does the engine send a request to the IPMI module to restart the power supply? Is it necessary to configure power management modules in the production environment? Are there any risks? Thanks!

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oVirt 4.4.8 Async update #4
by Sandro Bonazzola 23 Sep '21

23 Sep '21

oVirt 4.4.8 Async update #4 On September 23rd 2021 the oVirt project released an async update to the following packages: - ovirt-engine 4.4.8.6 Fixing the following bugs: Bug 2005221 <https://bugzilla.redhat.com/show_bug.cgi?id=2005221> - Cluster compatibility version upgrade from 4.5 to 4.6 -- Sandro Bonazzola MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV Red Hat EMEA <https://www.redhat.com/> sbonazzo(a)redhat.com <https://www.redhat.com/> *Red Hat respects your work life balance. Therefore there is no need to answer this email out of your office hours.*

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Sparse VMs from Templates - Storage issues
by Shantur Rathore 23 Sep '21

23 Sep '21

Hi all, I have a setup as detailed below - iSCSI Storage Domain - Template with Thin QCOW2 disk - Multiple VMs from Template with Thin disk oVirt Node 4.4.4 When the VMs boots up it downloads some data to it and that leads to increase in volume size. I see that every few seconds the VM gets paused with "VM X has been paused due to no Storage space error." and then after few seconds "VM X has recovered from paused back to up" Sometimes after a many pause and recovery the VM dies with "VM X is down with error. Exit message: Lost connection with qemu process." and I have to restart the VMs. My questions. 1. How to work around this dying VM? 2. Is there a way to use sparse disks without VM being paused again and again? Thanks in advance. Shantur

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about the vm disk type
by Tommy Sway 23 Sep '21

23 Sep '21

When I create the VM's image disk, I am not asked to select the following type of disk. What is the default value ? Thanks. QCOW2 Formatted Virtual Machine Storage QCOW2 is a storage format for virtual disks. QCOW stands for QEMU copy-on-write. The QCOW2 format decouples the physical storage layer from the virtual layer by adding a mapping between logical and physical blocks. Each logical block is mapped to its physical offset, which enables storage over-commitment and virtual machine snapshots, where each QCOW volume only represents changes made to an underlying virtual disk. The initial mapping points all logical blocks to the offsets in the backing file or volume. When a virtual machine writes data to a QCOW2 volume after a snapshot, the relevant block is read from the backing volume, modified with the new information and written into a new snapshot QCOW2 volume. Then the map is updated to point to the new place. Raw The raw storage format has a performance advantage over QCOW2 in that no formatting is applied to virtual disks stored in the raw format. Virtual machine data operations on virtual disks stored in raw format require no additional work from hosts. When a virtual machine writes data to a given offset in its virtual disk, the I/O is written to the same offset on the backing file or logical volume. Raw format requires that the entire space of the defined image be preallocated unless using externally managed thin provisioned LUNs from a storage array.

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