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ovirt and blk-mq
by Fabrice Bacchella 13 Mar '19

13 Mar '19

When checking block device configuration, on an ovirt configuration using a SAN, I found this line: dm/use_blk_mq:0 Did someone try it, by adding in the kernel command line: dm_mod.use_blk_mq=y I'm not sure, but it might improve performance on multipath, even on spinning rust.

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oVirt SImpleBackup Question
by Robin Gaudreau 13 Mar '19

13 Mar '19

Good morning, I have installed the ovirt SimpleBackup per the documentation. https://github.com/zipurman/oVIRT_Simple_Backup/blob/master/server/installe… I am able to backup vms with no issues. However, I am having issues with the restore. It creates the restored vm but is fails to add the disk? Has anyone seen this issue? Thank you for your help, Robin

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oVirt 4.3.2 Second Release Candidate is now available
by Sandro Bonazzola 13 Mar '19

13 Mar '19

The oVirt Project is pleased to announce the availability of the oVirt 4.3.2 Second Release Candidate, as of March 13th, 2019. This update is a release candidate of the second in a series of stabilization updates to the 4.3 series. This is pre-release software. This pre-release should not to be used in production. This release is available now on x86_64 architecture for: * Red Hat Enterprise Linux 7.6 or later * CentOS Linux (or similar) 7.6 or later This release supports Hypervisor Hosts on x86_64 and ppc64le architectures for: * Red Hat Enterprise Linux 7.6 or later * CentOS Linux (or similar) 7.6 or later * oVirt Node 4.3 (available for x86_64 only) Experimental tech preview for x86_64 and s390x architectures for Fedora 28 is also included. See the release notes [1] for installation / upgrade instructions and a list of new features and bugs fixed. Notes: - oVirt Guest Tools with new oVirt Windows Guest Agent is available - oVirt Appliance is already available - oVirt Node is already available [2] Additional Resources: * Read more about the oVirt 4.3.2 release highlights: http://www.ovirt.org/release/4.3.2/ * Get more oVirt Project updates on Twitter: https://twitter.com/ovirt * Check out the latest project news on the oVirt blog: http://www.ovirt.org/blog/ [1] http://www.ovirt.org/release/4.3.2/ [2] http://resources.ovirt.org/pub/ovirt-4.3-pre/iso/ -- SANDRO BONAZZOLA MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV Red Hat EMEA <https://www.redhat.com/> sbonazzo(a)redhat.com <https://red.ht/sig>

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Ovirt 4.3.1 cannto set host to maintenance
by Strahil Nikolov 13 Mar '19

13 Mar '19

Hi Community, I have tried to download my OVF_STORE images that were damaged on the shared storage , but it Failed.In result , I cannot set any host into maintenance via the UI.I have found out this bug 1586126 – After upgrade to RHV 4.2.3, hosts can no longer be set into maintenance mode. , but the case is different as mine has failed and should not block that operation. | | | | 1586126 – After upgrade to RHV 4.2.3, hosts can no longer be set into ma... | | | Here are 2 screenshots:Imgur | | | | | | | | | | | Imgur Imgur Post with 0 votes and 1 views. | | | Imgur | | | | | | | | | | | Imgur Imgur Post with 0 votes and 0 views. | | | How can I recover from that situation? Best Regards,Strahil Nikolov

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iSCSI domain creation ; nothing happens
by Guillaume Pavese 13 Mar '19

13 Mar '19

My setup : oVirt 4.3.1 HC on Centos 7.6, everything up2date I try to create a new iSCSI Domain. It's a new LUN/Target created on synology bay, no CHAP (I tried with CHAP too but that does not help) I first entered the syno's address and clicked discover I saw the existing Targets ; I clicked on the arrow on the right. I then get the following Error : "Error while executing action: Failed to setup iSCSI subsystem" In hosts logs, I get conn 0 login rejected: initiator error (02/00) Connection1:0 to [target: iqn.2000-01.com.synology:SVC-STO-FR-301.Target-2.2dfed4a32a, portal: 10.199.9.16,3260] through [iface: default] is shutdown. In engine logs, I get : 2019-03-12 14:33:35,504+01 INFO [org.ovirt.engine.core.bll.storage.connection.ConnectStorageToVdsCommand] (default task-24) [85d27833-b5d5-4bc8-b43c-88d980c30333] Running command: ConnectStorageToVdsCommand internal: false. Entities affected : ID: aaa00000-0000-0000-0000-123456789aaa Type: SystemAction group CREATE_STORAGE_DOMAIN with role type ADMIN 2019-03-12 14:33:35,511+01 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.ConnectStorageServerVDSCommand] (default task-24) [85d27833-b5d5-4bc8-b43c-88d980c30333] START, ConnectStorageServerVDSCommand(Host Name = ps-inf-int-kvm-fr-305-210.hostics.fr, StorageServerConnectionManagementVDSParameters:{hostId='6958c4f7-3716-40e4-859a-bfce2f6dbdba', storagePoolId='00000000-0000-0000-0000-000000000000', storageType=' ISCSI', connectionList='[StorageServerConnections:{id='null', connection='10.199.9.16', iqn='iqn.2000-01.com.synology:SVC-STO-FR-301.Target-2.2dfed4a32a', vfsType='null', mountOptions='null', nfsVersion='nul l', nfsRetrans='null', nfsTimeo='null', iface='null', netIfaceName='null'}]', sendNetworkEventOnFailure='true'}), log id: 7f36d8a9 2019-03-12 14:33:36,302+01 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.ConnectStorageServerVDSCommand] (default task-24) [85d27833-b5d5-4bc8-b43c-88d980c30333] FINISH, ConnectStorageServerVDSCommand, re turn: {00000000-0000-0000-0000-000000000000=465}, log id: 7f36d8a9 2019-03-12 14:33:36,310+01 ERROR [org.ovirt.engine.core.bll.storage.connection.ISCSIStorageHelper] (default task-24) [85d27833-b5d5-4bc8-b43c-88d980c30333] The connection with details '00000000-0000-0000-0000-000000000000' failed because of error code '465' and error message is: failed to setup iscsi subsystem 2019-03-12 14:33:36,315+01 ERROR [org.ovirt.engine.core.bll.storage.connection.ConnectStorageToVdsCommand] (default task-24) [85d27833-b5d5-4bc8-b43c-88d980c30333] Transaction rolled-back for command 'org.ovirt.engine.core.bll.storage.connection.ConnectStorageToVdsCommand'. 2019-03-12 14:33:36,676+01 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.GetDeviceListVDSCommand] (default task-24) [70251a16-0049-4d90-a67c-653b229f7639] START, GetDeviceListVDSCommand(HostName = ps-inf-int-kvm-fr-305-210.hostics.fr, GetDeviceListVDSCommandParameters:{hostId='6958c4f7-3716-40e4-859a-bfce2f6dbdba', storageType='ISCSI', checkStatus='false', lunIds='null'}), log id: 539fb345 2019-03-12 14:33:36,995+01 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.GetDeviceListVDSCommand] (default task-24) [70251a16-0049-4d90-a67c-653b229f7639] FINISH, GetDeviceListVDSCommand, return: [], log id: 539fb345 Guillaume Pavese Ingénieur Système et Réseau Interactiv-Group

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oVirt Performance (Horrific)
by drew.rash＠gmail.com 13 Mar '19

13 Mar '19

Hi everybody, my coworker and I have some decent hardware that would make great single servers, and then we through in a 10gb switch with 2x10gbps cards in 4 boxes. We have 2 excellent boxes - super micro board (disabled speed step) with 14 core intel i9's 7940x's, 128 GB ram (3200), 1tb m.2 samsung 870 evo's, 1tb ssd samsung, 1 8TB WD Gold, 1 6TB WD gold. Then we have 2 boxes (1 with 8 core i7-9700k, 1 with 6 core i7-8700) 128GB ram in one, 64GB ram in the other all 3000MHz with the same 1tb ssd,6tb wd gold, 8tb wd gold drives as the other boxes and 10gbps cards. Our problem is performance. We used the slower boxes for KVM(libvirt) and FreeNAS at first which was great performance wise. Then we bought the new super micro boxes and converted to oVirt + Gluster and did some basic write test using dd writing zero's to files from 1GB up to 50GB and were happy with the numbers writing directly to the gluster. But then we stuck a windows VM on it and turned it on...I'll stop there..because turning it on stopped any performance testing. This thing blew goat cheese. It was so slow the oVirt guest agent doesn't even start along with MS SQL server engine sometimes and other errors. So naturally, we removed the gluster from the equation. We took one of the 8TB WD Gold drives, made it a linux NFS share and gave it to oVirt to put VM's on as an NFS Domain. Just a single drive. Migrated the disk with the fresh windows 10 installation to it configured as VirtIO-SCSI, and booted the vm with 16GB ram, 8:1:1 cpu's. To our surprise it still blew. Just ran a winsat disk -drive c: for example purposes and the spice viewer repeatedly freezing, had the resource monitor open watching the 10,000ms disk response times with results...results were I rebooted because the results disappeared I didn't run it as administrator. And opening a command prompt is painful, the disk is still in use The task manager has no words on it. Disk is writing like 1MBps. command prompt finally showed up and looked blank with the cursor offset with no words anywhere. So the reboot took .. Well turning off took 2 minutes. Booting took 6 minutes 30 seconds ish. Logging in: 1m+ So 9-10 minutes to reboot and log back in a fresh windows install. Then 2 minutes to open a command prompt, task manager and resource monitor. During the write test disk i/o on the vm was less than 8, from the graph looks like 6MBps. Network traffic is like 20Mbps average, cpu is near zero, a couple spikes up to 30MBps on the disk. I ran this same thing on my disk and it finished in <1m. Ran it on the vm...still running after 30 minutes. I'll wait for the results to post them here. Ok It's been 30 minutes and it's still writing. I don't see the writes in the resource monitor, windows is doing a bunch of random app updates or something with candy crush on a fresh install and, ok so I hit enter a bunch of times on the prompt and it moved down to a flush-seq...and now it shows up in the resource monitor doing something again...I just ran this on my pc and it finished in less than a minute... whatever it's doing it's almost running at 1MB/s I think something went wrong because it only shows like 2 minutes passing at any test and then a total of 37 minutes. And at no time did the windows resource graphs or any of the oVirt node system graphs show more than like 6MB/s and definitely not 50 or 1GBps... flat out lies here. C:\Windows\system32>winsat disk -drive c Windows System Assessment Tool > Running: Feature Enumeration '' > Run Time 00:00:00.00 > Running: Storage Assessment '-drive c -ran -read' > Run Time 00:00:12.95 > Running: Storage Assessment '-drive c -seq -read' > Run Time 00:00:20.59 > Running: Storage Assessment '-drive c -seq -write' > Run Time 00:02:04.56 > Run Time 00:02:04.56 > Running: Storage Assessment '-drive c -flush -seq' > Run Time 00:01:02.75 > Running: Storage Assessment '-drive c -flush -ran' > Run Time 00:01:50.20 > Dshow Video Encode Time 0.00000 s > Dshow Video Decode Time 0.00000 s > Media Foundation Decode Time 0.00000 s > Disk Random 16.0 Read 5.25 MB/s 5.1 > Disk Sequential 64.0 Read 1220.56 MB/s 8.6 > Disk Sequential 64.0 Write 53.61 MB/s 5.5 > Average Read Time with Sequential Writes 22.994 ms 1.9 > Latency: 95th Percentile 85.867 ms 1.9 > Latency: Maximum 325.666 ms 6.5 > Average Read Time with Random Writes 29.548 ms 1.9 > Total Run Time 00:37:35.55 I even ran it again and it had the exact same results. So I'll try copying a file from a 1gbps network location with an ssd to this pc. It's a 4GB CentOS7 ISO to the desktop. It said 20MB/s then up to 90MB/s...then it dropped after doing a couple gigs. 2.25 gigs to go and it's going at 2.7MB/s with some fluctuations up to 5MB. So to drive this home at the same time... I copied the file off the same server to another server with ssd disks and it ran at 100MB/s which is what I'd expect over a 1gbps network. All this said, we do have an ssd gluster 2+1 arbiter (which seemed fastest when we tested different variations) on the 1TB ssd's. I was able to do reads from the array inside a VM at 550MB/s which is expected for an ssd. We did dd writing zero's and got about 550MB/s also from the ovirt node. But inside a VM the best we get is around ~10MB/s writing. Basically done the same testing using windows server 2016, boot terrible, opening applications terrible. But with sql server running off the ssd gluster I can read at 550MB/s but writing is horrific somewhere around 2-10MB/s. Latency between the nodes with ping is 100us ish. The hardware should be able to do 200MB/s HDD's, 550MB/s SSD's but it doesn't. And it's evident in every writing scenario inside a vm. Migrating VM's is also at this speed. Gluster healing seems to run faster, we've seen it conusme 7-9 Gbps. So I feel this is an oVirt issue and not gluster. Especially since all the tests above are the same when using an NFS mount on the box running the VM in oVirt. Please guide me. I can post pictures and such if needed, logs whatever. Just ask.

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Suggestions on adding 1000 or more networks to an engine/hosts
by Brian Wilson 12 Mar '19

12 Mar '19

So we have a use case where our engines will will be hosting development sandbox clusters. We need to have upwards of 1000 networks on some of these. I understand there is no theoretical limit to the number of networks does any body have a good reliable way of instantiating all of these networks. We have been using ansible for POCs and doing 100 Networks have not had a problem getting them on there however when upping the number to many more it begins to take longer and longer between each one and eventually timed iout and only got to 1567 Example Task we are using for this: tasks: - name: Add More Networks ovirt_network: auth: "{{ ovirt_auth }}" data_center: "{{ pcloud_name }}" name: "{{ pcloud_name }}-{{ item }}" state: present label: uplink vlan_tag: "{{ item }}" clusters: - name: "{{ ovirt_cluster }}" assigned: yes required: no display: no migration: no gluster: no with_sequence: start=1551 end=2500 What are some better ways of bulk additions of networks? Would the API provide a better solution so as to sorta bulk cache them then initiate the save?

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Should we remove direct luns from VM before creating snapshots?
by zodaoko＠gmail.com 12 Mar '19

12 Mar '19

We know that now oVirt doesn't make snapshot for direct lun. Please consider this scenario: I have a VM with total 2 disks: the os image disk is created on the nfs domain, while the other one is a direct lun disk. Now I'd like to create a snapshot, 1. should I remove the direct lun disk first, then make a snapshot? 2. If I don't remove the direct lun disk, oVirt will exclude it automatically, and snapshot can also be created successfully. But I have no idea if this is supported by oVirt, please anyone can make some comments? Thanks much.

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Change the cluster with hosted engine
by Fabrice SOLER 12 Mar '19

12 Mar '19

Hello, I need to create a windows 10 virtual machine, but an error message appears : The ovirt installation is fresh in 4.2.8 version with an hosted engine. At the hosted engine installation, there was no question where we can specify the cluster cpu. It should be great if in a future version it could be. I have created a new cluster with an SandBridge Family CPU type but now I need to move the hosted engine into this new cluster. To move a vm to another cluster the VM should be stopped. But if i power off the hosted engine, I will not be able to move the VM. Maybe there is a solution without create another cluster ... Is there someone who have an idea to do this ? Sincerely, Fabrice SOLER

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how to auto login my web UI
by du_hongyu＠yeah.net 12 Mar '19

12 Mar '19

Hi， I integrate my web UI by oVirt uiplugin， but I need login ovirt web UI and my web, I want only login ovirt web UI, my web get authentication info, can you give me some suggestion? Regards Hongyu Du

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