- Users - oVirt List Archives

Gluster storage options
by Shareef Jalloq 23 Jan '20

23 Jan '20

Hi there, I'm wanting to build a 3 node Gluster hyperconverged setup but am struggling to find documentation and examples of the storage setup. There seems to be a dead link to an old blog post on the Gluster section of the documentation: https://www.ovirt.org/blog/2018/02/up-and-running-with-ovirt-4-2-and-gluste… Is the flow to install the oVirt Node image on a boot drive and then add disks for Gluster? Or is Gluster setup first with ovirt installed on top? Thanks.

2 1

Disconnecting drive from VM
by anthonywest＠alfatron.com.au 23 Jan '20

23 Jan '20

Hi! For a Virtual Machine that is already shutdown, does anyone know if I can detach a disk from the VM, export the remaining parts of the VM, then reattach the disk without causing any problems with the software installed in the VM? Thanks, Anthony

3 2

Memory problem
by Stefan Wolf 23 Jan '20

23 Jan '20

Hi to all, I ve a memory problem I got this error: Used memory of host kvm380.durchhalten.intern in cluster Default [96%] exceeded defined threshold [95%]. after reviewing the server with top command, I found ovn-controller with heavy memory usage: 45055 root 10 -10 46,5g 45,4g 2400 S 51,3 72,4 627:58.60 ovn-controller after restarting ovn-controller, every thing is fine again. after some days, it uses so much memory again. I ve also tried to wait a day or two, after that it seems to restart it self. is there a solution that ovn-controller does not use so much memory or restart automatic? thx shb

2 1

Re: possible to export a running VM to OVA?
by Jürgen Walch 22 Jan '20

22 Jan '20

Shutting down the VM during the export will give you a fully consistent state of the VM whereas snapshots without further help from the VM itself will only provide "crash consistency", that is provide you with a disk image equivalent to one where the power cord was plugged out of the running machine, which is usually, but not always consistent enough :) BTW: As far as I understand the OVA export run from the engines web-gui *is* also doing a snapshot. You can see the snapshot if you have a look at the VM's disks while the export is running. -- juergen

1 0

Re: oVirt on a Single Server
by Staniforth, Paul 22 Jan '20

22 Jan '20

Hello Matt, probably the easiest setup to test/evaluate oVirt it to use ORB https://www.ovirt.org/documentation/ovirt-orb/ oVirt Orb | oVirt<https://www.ovirt.org/documentation/ovirt-orb/> oVirt is a free open-source virtualization solution for your entire enterprise www.ovirt.org From version 4.2 you can setup a single node hyper-converged install but it requires more skills and resources. https://www.ovirt.org/documentation/gluster-hyperconverged/chap-Introductio… Introduction | oVirt<https://www.ovirt.org/documentation/gluster-hyperconverged/chap-Introductio…> Chapter: Introduction. Hyperconvergence is a type of infrastructure system with a software-centric architecture that tightly integrates compute, storage, networking and virtualization resources and other technologies from scratch in a commodity hardware box supported by a single vendor[1]. www.ovirt.org You could also use nested virtualization on KVM and virt-manager, use your host to provide NFS, iscsi or gluster and then provide a nested VM for the engine and hosts. Regards, Paul S. ________________________________ From: Matt R <webmattr(a)hotmail.com> Sent: 21 January 2020 08:05 To: Tony Brian Albers <tba(a)kb.dk> Cc: users(a)ovirt.org <users(a)ovirt.org> Subject: [ovirt-users] Re: oVirt on a Single Server Caution External Mail: Do not click any links or open any attachments unless you trust the sender and know that the content is safe. That was my original configuration, but I found that it wouldn't let me add the local machine as a host, and so I thought perhaps I needed to use the self-hosted deployment methodology instead. Would a regular engine be better for my deployment type? If so, I can investigate why that isn't working, and start over. Sent from my iPad > On Jan 20, 2020, at 11:46 PM, Tony Brian Albers <tba(a)kb.dk> wrote: > >> On Tue, 2020-01-21 at 07:35 +0000, webmattr(a)hotmail.com wrote: >> Hello, >> >> I can't seem to install the self-hosted engine onto local storage. It >> gives me glustefs, iscsi, fc, and nfs as the available options. I'm >> using this in a home-lab scenario, and don't have budget/etc. for >> building out a dedicated NAS for it, or setting up multiple nodes. I >> like the look of oVirt, and wanted to try it with a couple disposable >> vm's (plex, and a docker instance I break often). My current best- >> thought for how to make it work is to setup NFS on the server, and >> then point the self-hosted engine at the (local) NFS share. Is there >> a better way to do this that I might be overlooking?* >> >> *Factoring that I don't have the funds to build out a proper storage >> environment, yet. >> >> (and if anyone asks, I did search for a solution to this, but didn't >> find anything super helpful. Mostly I found 5+ year old articles on a >> similar but different scenario). >> > > Well, if you can live with a regular engine(not self-hosted), this > works: > > https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovirt… > > > HTH > > /tony > > > > > > > _______________________________________________ Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)ovirt.org Privacy Statement: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovirt… oVirt Code of Conduct: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovirt… List Archives: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.ovi… To view the terms under which this email is distributed, please go to:- http://leedsbeckett.ac.uk/disclaimer/email/

1 0

OVA export to NFS share slow
by Jürgen Walch 22 Jan '20

22 Jan '20

Hello, we are using oVirt on a production system with a three node hyperconverged-cluster based on GlusterFS with a 10Gbit storage backbone network. Everything runs smooth except OVA exports. Each node has a NFS mount mounted on /data/ova with custom mount option "soft". The NFS server used is a plain vanilla CentOS7 host with /etc/exports containing a line /data/ova *(rw,all_squash,anonuid=36,anongid=36) When exporting VM's as OVA using the engine web gui, the export is terribly slow (~4MiB/s), it succeeds for small disks (up to 20GB), exporting larger disks fails with a timeout. The network link between oVirt-nodes and NFS server is 1Gbit. I have done a little testing and looked at the code in /usr/share/ovirt-engine/playbooks/roles/ovirt-ova-pack/files/pack_ova.py. It seems, the export is done by setting up a loop device /dev/loopX on the exporting node linked to a freshly generated sparse file /data/ova/{vmname}.tmp on the NFS share and then exporting the disk using qemu-img with target /dev/loopX. Using iotop on the node doing the export I can see write rates ranging from 2-5 Mib/s on the /dev/loopX device. When copying to the NFS share /data/ova using dd or qemu-img *directly* (that is using /data/ova/test.img instead of the loop device as target) I am getting write rates of ~100MiB/s which is the expected performance of the NFS servers underlying harddisk-system and the network connection. It seems that the loop device is the bottleneck. So far I have been playing with NFS mount options and the options passed to qemu-img in /usr/share/ovirt-engine/playbooks/roles/ovirt-ova-pack/files/pack_ova.py without any success. Any ideas or anyone with similar problems ? 😊 -- juergen walch

2 1

possible to export a running VM to OVA?
by Jayme 21 Jan '20

21 Jan '20

I'm looking at using a script similar to https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/export_v… to export VMs as OVA for backup purposes. I tested it out and it seems that it does create a snapshot and allows me to export an OVA of a running VM. I read in guides that the VM should be shutdown before exporting to OVA but I'm not sure if that info is still relevant.

1 0

Gluster: a lof of Number of ntries in heal pending
by Stefan Wolf 21 Jan '20

21 Jan '20

Hello to all, I ve a problem with gluster [root@kvm10 ~]# gluster volume heal data info summary Brick kvm10:/gluster_bricks/data Status: Connected Total Number of entries: 868 Number of entries in heal pending: 868 Number of entries in split-brain: 0 Number of entries possibly healing: 0 Brick kvm320.durchhalten.intern:/gluster_bricks/data Status: Connected Total Number of entries: 1 Number of entries in heal pending: 1 Number of entries in split-brain: 0 Number of entries possibly healing: 0 Brick kvm360.durchhalten.intern:/gluster_bricks/data Status: Connected Total Number of entries: 867 Number of entries in heal pending: 867 Number of entries in split-brain: 0 Number of entries possibly healing: 0 Brick kvm380.durchhalten.intern:/gluster_bricks/data Status: Connected Total Number of entries: 868 Number of entries in heal pending: 868 Number of entries in split-brain: 0 Number of entries possibly healing: 0 [root@kvm10 ~]# gluster volume heal data info split-brain Brick kvm10:/gluster_bricks/data Status: Connected Number of entries in split-brain: 0 Brick kvm320.durchhalten.intern:/gluster_bricks/data Status: Connected Number of entries in split-brain: 0 Brick kvm360.durchhalten.intern:/gluster_bricks/data Status: Connected Number of entries in split-brain: 0 Brick kvm380.durchhalten.intern:/gluster_bricks/data Status: Connected Number of entries in split-brain: 0 As I understand there is no split-brain but 868 files ar in state heal pending. I ve restarted every node. I ve also tried: [root@kvm10 ~]# gluster volume heal data full Launching heal operation to perform full self heal on volume data has been successful Use heal info commands to check status. but even after a week there is no really change ( I started with 912 Number of entries in heal pending) can somebody tell what exactly is the problem and how can I solve it. thank you very much

3 6

Re: oVirt on a Single Server
by Tony Brian Albers 21 Jan '20

21 Jan '20

In a small environment I think the easiest way would be to use the local machine as a host and then run the engine as a vm on a laptop or an older PC. As long as you have memory enough it runs on pretty much anything. Be careful when using local storage, it's got some special requirements: https://www.ovirt.org/documentation/admin-guide/chap-Storage.html /tony On Tue, 2020-01-21 at 08:05 +0000, Matt R wrote: > That was my original configuration, but I found that it wouldn't let > me add the local machine as a host, and so I thought perhaps I needed > to use the self-hosted deployment methodology instead. > > Would a regular engine be better for my deployment type? If so, I can > investigate why that isn't working, and start over. > > Sent from my iPad > > > On Jan 20, 2020, at 11:46 PM, Tony Brian Albers <tba(a)kb.dk> wrote: > > > > > On Tue, 2020-01-21 at 07:35 +0000, webmattr(a)hotmail.com wrote: > > > Hello, > > > > > > I can't seem to install the self-hosted engine onto local > > > storage. It > > > gives me glustefs, iscsi, fc, and nfs as the available options. > > > I'm > > > using this in a home-lab scenario, and don't have budget/etc. for > > > building out a dedicated NAS for it, or setting up multiple > > > nodes. I > > > like the look of oVirt, and wanted to try it with a couple > > > disposable > > > vm's (plex, and a docker instance I break often). My current > > > best- > > > thought for how to make it work is to setup NFS on the server, > > > and > > > then point the self-hosted engine at the (local) NFS share. Is > > > there > > > a better way to do this that I might be overlooking?* > > > > > > *Factoring that I don't have the funds to build out a proper > > > storage > > > environment, yet. > > > > > > (and if anyone asks, I did search for a solution to this, but > > > didn't > > > find anything super helpful. Mostly I found 5+ year old articles > > > on a > > > similar but different scenario). > > > > > > > Well, if you can live with a regular engine(not self-hosted), this > > works: > > > > https://www.ovirt.org/documentation/install-guide/chap-Installing_oVirt.html > > > > > > HTH > > > > /tony > > > > > > > > > > > > > >

1 0

oVirt on a Single Server
by webmattr＠hotmail.com 21 Jan '20

21 Jan '20

Hello, I can't seem to install the self-hosted engine onto local storage. It gives me glustefs, iscsi, fc, and nfs as the available options. I'm using this in a home-lab scenario, and don't have budget/etc. for building out a dedicated NAS for it, or setting up multiple nodes. I like the look of oVirt, and wanted to try it with a couple disposable vm's (plex, and a docker instance I break often). My current best-thought for how to make it work is to setup NFS on the server, and then point the self-hosted engine at the (local) NFS share. Is there a better way to do this that I might be overlooking?* *Factoring that I don't have the funds to build out a proper storage environment, yet. (and if anyone asks, I did search for a solution to this, but didn't find anything super helpful. Mostly I found 5+ year old articles on a similar but different scenario).

6 6