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Hosted Engine Storage migration
by joel+ovirt＠robisons.us 25 Mar '19

25 Mar '19

Hello listmembers! I'm in search of some steps to use to migrate my Hosted-Engine from one NFS storage domain to another different NFS storage domain. One of the possible ways to accomplish this task may already be a feature with oVirt 4.1, I'm using 4.2 https://lists.ovirt.org/pipermail/users/2017-January/078739.html (New feature in 4.1?) Will someone elaborate the steps to use this new feature and how I could use it to accomplish this task? the bug link in the email linked above has a comment (https://bugzilla.redhat.com/show_bug.cgi?id=1409112#c12) - does this mean I need to redeploy the hosted-engine? I'm not able to follow as I'm new to oVirt and still learning the ins and outs and design if I'm on the wrong path here please correct me. Thank you, -Joel

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Hosts not coming back into oVirt
by Arif Ali 25 Mar '19

25 Mar '19

Hi all, Recently deployed oVirt version 4.3.1 It's in a self-hosted engine environment Used the steps via cockpit to install the engine, and was able to add the rest of the oVirt nodes without any specific problems We tested the HA of the hosted-engine without a problem, and then at one point of turn off the machine that was hosting the engine, to mimic failure to see how it goes; the vm was able to move over successfully, but some of the oVirt started to go into Unassigned. From a total of 6 oVirt hosts, I have 4 of them in this state. Clicking on the host, I see the following message in the events. I can get to the hosts via the engine, and ping the machine, so not sure what it's doing that it's no longer working VDSM <snip> command Get Host Capabilities failed: Message timeout which can be caused by communication issues Mind you, I have been trying to resolve this issue since Monday, and have tried various things, like rebooting and re-installing the oVirt hosts, without having much luck So any assistance on this would be grateful, maybe I've missed something really simple, and I am overlooking it -- regards, Arif Ali

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CLI command to export VMs
by Sakhi Hadebe 25 Mar '19

25 Mar '19

Hi, What is the CLI command to export VMs as OVA? -- Regards, Sakhi Hadebe

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illegal Disk state
by Bryan Sockel 25 Mar '19

25 Mar '19

Hi, Had an issue with a vm over the weekend and i am now unable to start the vm. Both Disks show up in an illegal state when i attempt to launch the vm. Any help would be greatly appreciated. Below are the portions of vdsm.log and engine.log files. VM is stored on an ISCSI Lun. VDSM.Log - https://docs.google.com/document/d/1RWxka-EtiPHF9KWjvZrVCuV90tVKRZtOefvkXQp… Engine.Log - https://docs.google.com/document/d/1wyGrlxemI_hPgUeVlCibi0AYCO7NL_HVyXv_ICo… Thank You, Bryan Sockel

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Re: High iowait and low throughput on NFS, oflag=direct fixes it?
by Strahil 25 Mar '19

25 Mar '19

What are the mount options ? I think I read somewhere about poor NFS performance. I think that 'async' mount option was a kind of solution. Best Regards, Strahil NikolovOn Mar 25, 2019 15:45, Frank Wall <fw(a)moov.de> wrote: > > Hi, > > I've been using oVirt for years and have just discovered a rather strange > issue that causes EXTREME high iowait when using a NFSv3 storage. > > Here's a quick test on a CentOS 7.6 VM running on any oVirt 4.2.x node: > (5 oVirt nodes, all showing the same results) > > # CentOS VM > $ dd if=/dev/zero of=TEST02 bs=1M count=3000 > 3000+0 records in > 3000+0 records out > 3145728000 bytes (3.1 GB) copied, 141.649 s, 22.2 MB/s > > # iostat output > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util > vdb 0.00 0.00 1.00 50.00 0.00 23.02 924.39 121.62 2243.47 2301.00 2242.32 19.61 100.00 > > > As you can see iowait is beyond bad both for read and write requests. > During this test the underlying NFS storage server was idle, disks barely > doing anything. iowait on the NFS storage server was very low. > > However, when using oflag=direct the test shows a completely different result: > > > # CentOS VM > $ dd if=/dev/zero of=TEST02 bs=1M count=3000 oflag=direct > 3000+0 records in > 3000+0 records out > 3145728000 bytes (3.1 GB) copied, 21.0724 s, 149 MB/s > > # iostat output > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util > vdb 0.00 0.00 4.00 483.00 0.02 161.00 677.13 2.90 5.96 0.00 6.01 1.99 97.10 > > > This test shows the *expected* performance in this small oVirt setup. > Notice how iowait remains healthy, although the throughput is 7x higher now. > > I think this 2nd test may prove multiple things: the NFS storage is fast > enough and there's no networking/switch issue either. > > Still, under normal conditions WRITE/READ operations are really slow and > iowait goes through the roof. > > Do these results make sense to anyone? Any hints how to find what's wrong here? > Any tests I should run or sysctls/tunables that would make sense? > > FWIW, iperf result looks good between the oVirt Node and the NFS storage: > > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 10.9 GBytes 9.36 Gbits/sec > > > Regards > - Frank > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ > List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/GUDZWGRLIVCEC…

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share ISO storage domain between 4.2 and 4.3 ??
by Matthias Leopold 25 Mar '19

25 Mar '19

Hi, My test and production oVirt environments share the ISO domain. When I upgrade the test environment to 4.3 the ISO domain will be used by oVirt 4.2 and 4.3 at the same time. Is that a problem? thx Matthias

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4.2.8 to 4.3.2 upgrade
by Leo David 25 Mar '19

25 Mar '19

Hi everyone, I have seen a lot of threads here regarding 4.3.x release regarding problems a different layers, most of them related to underneath gluster storage. I would do an upgrade though, thus benefiting the new added features. My thoughts would be: 1. did anyone succesfully went through this process, any problems occured during of after the upgrade ? 2. any sincere recomandation like "if it works don't fix it" considering the platform is running in production ? I would really apreciate your oppinion. Thank you very much ! Leo

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Re: Can't connect to storage
by Strahil 25 Mar '19

25 Mar '19

You can check if any hosts' network is out of sync. Also try ssh from engine to each host. Best Regards, Strahil NikolovOn Mar 24, 2019 16:05, Julio Cesar Bustamante <julio.cesar.bustamante(a)gmail.com> wrote: > > Hi everyone > > I hace a problem with ovirtmanager 4.2. in the nodes can't connect to storage. They show these messages. What can I do yo Solve it? > > >

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Can't connect to storage
by Julio Cesar Bustamante 25 Mar '19

25 Mar '19

Hi everyone I hace a problem with ovirtmanager 4.2. in the nodes can't connect to storage. They show these messages. What can I do yo Solve it?

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Add Storage Domain to existing Datacenter - side effect
by jeanbaptiste.coupiac＠nfrance.com 25 Mar '19

25 Mar '19

Hello Guys, We are evaluating oVirt , and this morning I had to face to a side effect ( small impact because oVIrt Datacenter is actually a small one). 1. I added a new Storage domain from iSCSI SAN 2. Not all hosts HBA were authorized to access to this LUN (lack of configuration on SAN side) 3. One of ovirt Node on four nodes into my datacenter couldn't access to the LUN => this ovirt node has gone into "Non-responsible" state. => All VMs running into this host has gone to another My question is regarding the "operational mode" : * If I add a Storage Domain which is not already fully configured / badly configured ("regarding HBA acces granted on SAN side), when I add the Storage Domain to my DC, each oVirt node into my datacenter will move to "non-operationnal" state after fews seconds since no one will be able to log into the new LUN ? (This state change can have some "major effect" (vm migration between hosts without any logic) ?) Does I miss something ? Is there a guard ? Is Cluster Fencing policy option: Skip fencing on cluster connectivity issues => Threshold: xx% can protect this type of error ? Regards, Jean-Baptiste

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