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Restore from backup, consistent view between ovirt DB and Libvirt/QEMU
by Volenbovskyi, Konstantin 16 Feb '22

16 Feb '22

Hi, Let’s say that backup of ovirt engine is done once every day, for example 6 AM using engine-backup tool. Then during the day the changes are made that not only influence the database, but actually influence Libvirt/KVM/QEMU (create/delete VMs,snapshots, disks, ). Now let’s say at 18:00 an engineer restores from the backup. How the ovirt will be ‘synchronized’ to Libvirt (/QEMU)? Of course, it is OK to expect that system is being rolled back, but in that scenario there is nothing that I can imagine that will synchronize Ovirt database state to Libvirt/KVM/QEMU state. And once anything on (migrate/stop/start) – it will just fail in many cases because of inconsistency. In 4.2 documentation https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/ht… there is sentence like: “If migration is enabled at cluster level, virtual machines are automatically migrated to another host in the cluster; as a result, it is recommended that host reinstalls are performed at a time when the host’s usage is relatively low.“ Let’s say that there are 5 hosts (numbered from 1 to 5), 3 of them are hosted-engine (let’s say 1 to 3). Then first of all, person should find a brand new host (host 6), then install HE on that. OK, I understand that HE can be then reinstalled on hosts 1 to 3. But it when it comes VMs- if really migration of VMs can work, considering inconsistency above? Eg. snapshot that is already in QEMU (done at 11:00) and the volume chain is updated is gone from database (because it is restored to 6 AM) And in general, anything should be done towards non-HE hosts? So far the restore seems to be very intrusive and quite error-prone in two parts: first part is actual handling of VMs. And second part when ovirt-engine gets configured practically from scratch (through that dialog) BR, Konstantin

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Re: vm seal
by Nathanaël Blanchet 16 Feb '22

16 Feb '22

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Re: Problems configuring iscsi domain on ovirt 4.4.4.7-1.el8 / centos 8
by David Johnson 16 Feb '22

16 Feb '22

Ok. The nfs share with the vdsm group is working. But the intent is to switch to iSCSI. The little bit of documentation about iSCSI mentions nothing about vdsm or group 36. That gives me something to work with at least. Any ideas about how to clean up the mess left by the first attempt? I'm not finding the records for botched domain creation in the engine database, but the GUI shows them and complains that the iSCSI device is registered twice. On Wed, Feb 16, 2022, 2:06 AM Strahil Nikolov <hunter86_bg(a)yahoo.com> wrote: > To be honest, I just asked from curiosity. > In NFS it's mandatory to use group 36, but this is the linux group. > > I guess in TrueNAS it's something else, as I never configured group in > targetcli. > > The flow is usually: > - Target server listens on multiple IPs > - Client makes discovery on a single ip > - client logs in (lsscsi is the simplest approach to verify it) > - Client discovers and logs on other IPs that the target server uses > - Multipath aggregates the links > > As Multipath has a timeout of 20s while iscsi client uses 120s by default, > I usually change the client to use 15s timeout. > > When a path (for eample 1 switch is dead) is down, multipath will try > another link to reach the target server. > > It's nice there is a vdsm tool to configure those . > > WARNING: Never set clients with the same IQN (defined in a file in > /etc/iscsi...somethig -> see with rpm -ql iscsi-utils) > > Best Regards, > Strahil Nikolov > > On Wed, Feb 16, 2022 at 9:18, David Johnson > <djohnson(a)maxistechnology.com> wrote: > I used group 1 because nothing said what group to use, and googling "ovirt > iSCSI setup" returned nothing useful so I picked a number. If there is > someplace that actually gives detailed instructions I'm going to bookmark > it when I get the link. > > Yes, there is a storage network. There was a miscommunication and the > person attempting to create the connection didn't read instructions, so > they keyed in the main network ip, leaving a small mess for me to clean up. > The old truenas with nfs share is on the storage network and functioning > cleanly, and ovirt is able to see the iSCSI share on the storage network ip > address. > > Thank you. > > On Tue, Feb 15, 2022, 11:45 PM Strahil Nikolov <hunter86_bg(a)yahoo.com> > wrote: > > Did you configure a storage network on oVirt ? > > About the size, why you use group '1' and not group '36' ? > > Best Regards, > Strahil Nikolov > > On Tue, Feb 15, 2022 at 20:47, David Johnson > <djohnson(a)maxistechnology.com> wrote: > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-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/users@ovirt.org/message/2X7L3FUWHNPVX… > >

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Problems configuring iscsi domain on ovirt 4.4.4.7-1.el8 / centos 8
by David Johnson 16 Feb '22

16 Feb '22

Since the general recommendation seems to be to use iSCSI over NFS wth ovirt, I expect that I am missing something very obvious. Question: How do I complete the iSCSI storage domain configuration? Hardware configuration: - cluster controller - physical system - compute nodes - 2 - Current file store: NFS on TrueNAS - To-be file store: iSCSI on TrueNAS Problem reproduction: 1. We decided that the problems with NFS (regularly blocking and causing VM's to go into paused instead of IOWait mode) outweighed the benefit of ease of management, so we are preparing to move to iSCSI back end on TrueNAS. 2. We created an iSCSI share on the to-be TrueNAS system and granted access to a "ovirtuser" and group "1", with 30+ TB available storage. 3. We started to add the iscsi share to the ovirt data center using the GUI, under "Storage > Storage Domains" click the "New Domain" button. *Problem 1: *Ovirt immediately found the iSCSI share (yay), but says it has 0 GB and will not allow us to add it to the data center, or edit or remove it, so it is in a limbo state. *Problem 2: *Ovirt shows it on the wrong network (miscommunication). It is finding it on the general network instead of the isolated data network. The TrueNAS will be removed from the general network as soon as configuration is complete. Thank you *David Johnson*

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Cluster and datacenter compatibility levels
by Colin Coe 15 Feb '22

15 Feb '22

Hi all I'm looking for a definitive answer on what each compatibility level means. Specifically, I'm looking for: - new features - deprecated features - removed features We're on 4.3 so I'm looking for the info above on 4.4, 4.5 and 4.6 My main motivation is to ensure we don't lose SPICE support. We actually use RHV and I logged a case with Red Hat GSS but couldn't get the info I was after. Thanks

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vm seal
by Nathanaël Blanchet 14 Feb '22

14 Feb '22

Hello, I noticed that a vm created from a "sealed" template is initially mount on one host with libguestfs, with a virt-sysprep process, before getting ready to be used. This should be unuseful given that the template is already sealed. Is there a reason to that? -- Nathanaël Blanchet Supervision réseau SIRE 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 Tél. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 blanchet(a)abes.fr

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Re: Backup prozess
by marcel d'heureuse 14 Feb '22

14 Feb '22

Sure: https://github.com/vacosta94/VirtBKP Br Marcel Am 14. Februar 2022 20:29:47 MEZ schrieb Jonas Liechti <jonas(a)rabe.ch>: >Would you mind sharing a link to this script? I would be interested in how it works.Am 14.02.2022 19:45 schrieb marcel d'heureuse <marcel(a)deheureu.se>: >> >> Moin, >> >> We have in our Environment 12 servers managed by one self hosted engine. It is ovirt 4.3.9. We are Freizeit on that Version. >> >> How did you make Backups? We use a github Script which generate via api a snapshot and Mount this disk into the vm where the backup Script is running. The backup Script Export this additional Hard disk to a storage and disconnect the disk and remove the snapshot. >> >> This works on Linux vm fine if they have Medium load. If we try this with a Windows 10 vm or Windows Server vm or a Linux vm with high load or with a very big Hard drive this will not work. Disk can't Export and snapshot will not delete. >> >> I have found winchin and bareos but I have not start to check this first I want to have some more possible options. >> >> Thanks >> >> Marcel

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Re: Backup prozess
by Jonas Liechti 14 Feb '22

14 Feb '22

Would you mind sharing a link to this script? I would be interested in how it works.Am 14.02.2022 19:45 schrieb marcel d'heureuse <marcel(a)deheureu.se>: > > Moin, > > We have in our Environment 12 servers managed by one self hosted engine. It is ovirt 4.3.9. We are Freizeit on that Version. > > How did you make Backups? We use a github Script which generate via api a snapshot and Mount this disk into the vm where the backup Script is running. The backup Script Export this additional Hard disk to a storage and disconnect the disk and remove the snapshot. > > This works on Linux vm fine if they have Medium load. If we try this with a Windows 10 vm or Windows Server vm or a Linux vm with high load or with a very big Hard drive this will not work. Disk can't Export and snapshot will not delete. > > I have found winchin and bareos but I have not start to check this first I want to have some more possible options. > > Thanks > > Marcel

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Backup prozess
by marcel d'heureuse 14 Feb '22

14 Feb '22

Moin, We have in our Environment 12 servers managed by one self hosted engine. It is ovirt 4.3.9. We are Freizeit on that Version. How did you make Backups? We use a github Script which generate via api a snapshot and Mount this disk into the vm where the backup Script is running. The backup Script Export this additional Hard disk to a storage and disconnect the disk and remove the snapshot. This works on Linux vm fine if they have Medium load. If we try this with a Windows 10 vm or Windows Server vm or a Linux vm with high load or with a very big Hard drive this will not work. Disk can't Export and snapshot will not delete. I have found winchin and bareos but I have not start to check this first I want to have some more possible options. Thanks Marcel

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Remove obsolete Gluster hyperconverged doc
by Strahil Nikolov 14 Feb '22

14 Feb '22

Hi Sandro, It seems that with https://github.com/oVirt/ovirt-site/commit/f3286b2e1f2871978d054250556f1b4f… all refference to Gluster & Hyperconverged is removed from the website. Can you clarify the situation with Hyperconverged deployments ? Best Regards,Strahil Nikolov

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