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Low Performance (KVM Vs VMware Hypervisor) When running multi-process application
by Rav Ya 17 Sep '20

17 Sep '20

Hello Everyone, Please advice. Any help will be highly appreciated. Thank you in advance. Test Setup: 1. oVirt Centos 7.8 Virtulization Host 2. Guest VM Centos 7.8 (Mutiqueue enabled 6 vCPUs with 6 Rx Tx Queues) 3. The vCPUs are configured for host pass through (Pinned CPU). The Guest VM runs the application in userspace. The Application consists of the parent process that reads packets in raw socket mode from the interface and forwards then to child processes (~vCPUs) via IPC (shared memory – pipes). *The performance (throughput / CPU utilization) that I get with KVM is half of what I get with VMware.* Any thoughts on the below observations? Any suggestions? - KVM Guest VMs degraded performance when running multi-process applications. - High FUTEX time (Seen on the Guest VM when passing traffic). - *High SY: *System CPU time spent in kernel space (Seen on both Hypervisor and the Guest VMs only when running my application.) -Rav Ya

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[ANN] oVirt 4.4.3 First Release Candidate is now available for testing
by Lev Veyde 17 Sep '20

17 Sep '20

oVirt 4.4.3 First Release Candidate is now available for testing The oVirt Project is pleased to announce the availability of oVirt 4.4.3 First Release Candidate for testing, as of September 17th, 2020. This update is the third in a series of stabilization updates to the 4.4 series. Important notes before you try it Please note this is a pre-release build. The oVirt Project makes no guarantees as to its suitability or usefulness. This pre-release must not be used in production. Installation instructions For installation instructions and additional information please refer to: https://ovirt.org/documentation/ This release is available now on x86_64 architecture for: * Red Hat Enterprise Linux 8.2 or newer * CentOS Linux (or similar) 8.2 or newer This release supports Hypervisor Hosts on x86_64 and ppc64le architectures for: * Red Hat Enterprise Linux 8.2 or newer * CentOS Linux (or similar) 8.2 or newer * oVirt Node 4.4 based on CentOS Linux 8.2 (available for x86_64 only) See the release notes [1] for installation instructions and a list of new features and bugs fixed. Notes: - oVirt Appliance is already available for CentOS Linux 8 - oVirt Node NG will be available soon for CentOS Linux 8 Additional Resources: * Read more about the oVirt 4.4.3 release highlights: http://www.ovirt.org/release/4.4.3/ * 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/4.4.3/ [2] http://resources.ovirt.org/pub/ovirt-4.4-pre/iso/ -- Lev Veyde Senior Software Engineer, RHCE | RHCVA | MCITP Red Hat Israel <https://www.redhat.com> lev(a)redhat.com | lveyde(a)redhat.com <https://red.ht/sig> TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>

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UPN suffix and my SAM account do not have the sames domains
by dominique.deschenes＠gcgenicom.com 17 Sep '20

17 Sep '20

I have a SSO authentication question. In my Active Directory, my UPN suffix login and my SAM account do not have the sames domains. Example : UPN : dominique.test(a)abc.com Sam account : domtest(a)local.lan On the VM portal, I am able to connect with dominique.test(a)abc.com but not with domtest(a)local.lan (I have the following message:server_error: Cannot resolve principal 'domtest(a)local.lan' If I connect to the VM PORTAL with dominique.test(a)abc.com, when I click on "RDP Console" to get the link, the login of the RDP is dominique.test(a)local.lan. So I have to manually change the login to dominique.test(a)abc.com. Is it possible to use the Sam account domtes(a)local.lan instead of the UPN ? if not, is it possible to adjust the consol.rdp configuration and include the domain abc.com instead of local.lan ? In research I found this, but I don't have access. How to authenticate with Active directory when UPN suffix and Forest Name are different using AAA LDAP extension - Red Hat C https://access.redhat.com/solutions/2332561 Thank you

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Re: Random hosts disconnects
by Anton Louw 17 Sep '20

17 Sep '20

Hi Everybody, Did some digging around, and saw a few things regarding “vdsHeartbeatInSeconds” I had a look at the properties file located at /etc/ovirt-engine/engine-config/engine-config.properties, and do not see an entry for “vdsHeartbeatInSeconds.type=Integer”. Seeing as these data centers are geographically split, could the “vdsHeartbeatInSeconds” potentially be the issue? Is it safe to increase this value after I add “vdsHeartbeatInSeconds.type=Integer” into my engine-config.properties file? Thanks Anton Louw Cloud Engineer: Storage and Virtualization ______________________________________ D: 087 805 1572 | M: N/A A: Rutherford Estate, 1 Scott Street, Waverley, Johannesburg anton.louw(a)voxtelecom.co.za www.vox.co.za From: Anton Louw via Users <users(a)ovirt.org> Sent: 16 September 2020 09:01 To: users(a)ovirt.org Subject: [ovirt-users] Random hosts disconnects Hi All, I have a strange issue in my oVirt environment. I currently have a standalone manager which is running in VMware. In my oVirt environment, I have two Data Centers. The manager is currently sitting on the same subnet as DC1. Randomly, hosts in DC2 will say “Not Responding” and then 2 seconds later, the hosts will activate again. The strange thing is, when the manager was sitting on the same subnet as DC2, hosts in DC1 will randomly say “Not Responding” I have tried going through the logs, but I cannot see anything out of the ordinary regarding why the hosts would drop connection. I have attached the engine.log for anybody that would like to do a spot check. Thanks Anton Louw Cloud Engineer: Storage and Virtualization at Vox ________________________________ T: 087 805 0000 | D: 087 805 1572 M: N/A E: anton.louw(a)voxtelecom.co.za<mailto:anton.louw@voxtelecom.co.za> A: Rutherford Estate, 1 Scott Street, Waverley, Johannesburg www.vox.co.za<http://www.vox.co.za> [F]<https://www.facebook.com/voxtelecomZA> [T]<https://www.twitter.com/voxtelecom> [I]<https://www.instagram.com/voxtelecomza> [L]<https://www.linkedin.com/company/voxtelecom> [Y]<https://www.youtube.com/user/VoxTelecom> [#VoxBrand]<https://www.vox.co.za/fibre/fibre-to-the-home/?prod=HOME> Disclaimer The contents of this email are confidential to the sender and the intended recipient. Unless the contents are clearly and entirely of a personal nature, they are subject to copyright in favour of the holding company of the Vox group of companies. Any recipient who receives this email in error should immediately report the error to the sender and permanently delete this email from all storage devices. This email has been scanned for viruses and malware, and may have been automatically archived by Mimecast Ltd, an innovator in Software as a Service (SaaS) for business. Providing a safer and more useful place for your human generated data. Specializing in; Security, archiving and compliance. To find out more Click Here<https://www.voxtelecom.co.za/security/mimecast/?prod=Enterprise>.

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Ovirt legacy migration policy is missing
by ovirtand-cnj342＠yahoo.com 16 Sep '20

16 Sep '20

Hello, We have many cases of failed migrations, and reducing the load on the respective VMs made migration possible. Using "Suspend workload when needed" did not help either with the migrations, which only worked when stopping services on the VMs, thus reducing load. I was therefore trying to tweak the migration downtime setting. The suggested way of doing this is by using the Legacy migration policy. That being said, I am unable to find the Legacy migration policy in the VM Host tab, nor in the cluster's "Migration policy" tab. I cannot find any mention of it being left out of our current version (4.3.6.1) - moreover, the setting "Use custom migration downtime" (only available when using the Legacy migration policy) does exist in the interface - but I cannot find the Legacy policy itself. The only policies present are Minimal downtime (default for cluster), Post-copy migration and Suspend workload when needed. Is there a way to make the Legacy migration policy available if it's missing? Thanks! Best regards, Andy PS. Setting DefaultMaximumMigrationDowntime=20000 as default did not have any effect, presumably because the system uses one of the 3 pre-defined policies and ignores the "default"

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Low Performance (KVM Vs VMware Hypervisor) When running multi-process application
by Ravin Ya 16 Sep '20

16 Sep '20

Hello Everyone, Please advice. Any help will be highly appreciated. Thank you in advance. Test Setup: oVirt Centos 7.8 Virtulization Host Guest VM Centos 7.8 (Mutiqueue enabled 6 vCPUs with 6 Rx Tx Queues) The vCPUs are configured for host pass through (Pinned CPU). The Guest VM runs the application in userspace. The Application consists of the parent process that reads packets in raw socket mode from the interface and forwards then to child processes (~vCPUs) via IPC (shared memory – pipes). The performance (throughput / CPU utilization) that I get with KVM is half of what I get with VMware. Any thoughts on the below observations? Any suggestions? KVM Guest VMs degraded performance when running multi-process applications. High FUTEX time (Seen on the Guest VM when passing traffic). High SY: System CPU time spent in kernel space (Seen on both Hypervisor and the Guest VMs only when running my application.) -Rav Ya

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cpu QoS doesn't work
by pub.virtualization＠gmail.com 16 Sep '20

16 Sep '20

Hello, I set cpu QoS as 10 and applied it to VM on oVirt 4.2, but it doesn't seem to work. compared to VM without QoS, there wasn't any difference in cpu usage. Also, there wasn't any <period>...</period> or <quota>...</quota> field related to QoS in libvirt file. is it right result?? Thanks,

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Unable to create a node in oVirt 4.0
by Rodrigo G. López 16 Sep '20

16 Sep '20

Hi there, We are trying to setup a node in the same machine where we are running the engine, and noticed that the vdsmd service fails because the supervdsmd daemon can't authenticate against libvirtd afaict. The error is the following on supervdsmd: daemonAdapter[17803]: libvirt: XML-RPC error : authentication failed: authentication failed ... and in libvirtd: Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.410+0000: 17775: error : virNetSocketReadWire:1806 : End of file while reading data: Input/output error Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.612+0000: 17776: error : virNetSASLSessionListMechanisms:393 : internal error: cannot list SASL mechanisms -4 (SASL(-4): no mechanism available: Internal Error -4 in server.c near line 1757) Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.612+0000: 17776: error : remoteDispatchAuthSaslInit:3440 : authentication failed: authentication failed Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.612+0000: 17775: error : virNetSocketReadWire:1806 : End of file while reading data: Input/output error Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.814+0000: 17778: error : virNetSASLSessionListMechanisms:393 : internal error: cannot list SASL mechanisms -4 (SASL(-4): no mechanism available: Internal Error -4 in server.c near line 1757) Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.814+0000: 17778: error : remoteDispatchAuthSaslInit:3440 : authentication failed: authentication failed Sep 15 03:34:18 ovirt-test libvirtd[17775]: 2020-09-15 07:34:18.815+0000: 17775: error : virNetSocketReadWire:1806 : End of file while reading data: Input/output error Sep 15 03:34:19 ovirt-test libvirtd[17775]: 2020-09-15 07:34:19.017+0000: 17780: error : virNetSASLSessionListMechanisms:393 : internal error: cannot list SASL mechanisms -4 (SASL(-4): no mechanism available: Internal Error -4 in server.c near line 1757) Sep 15 03:34:19 ovirt-test libvirtd[17775]: 2020-09-15 07:34:19.017+0000: 17780: error : remoteDispatchAuthSaslInit:3440 : authentication failed: authentication failed Sep 15 03:34:19 ovirt-test libvirtd[17775]: 2020-09-15 07:34:19.020+0000: 17775: error : virNetSocketReadWire:1806 : End of file while reading data: Input/output error Is there any way to work around that? We have working infra on top of 4.0 in CentOS 7 systems, and we would like to replicate the exact same environment for availability purposes, in case anything bad happened. Best regards, -rodri

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Removal of deprecated init-scripts (network-scripts)
by Ales Musil 16 Sep '20

16 Sep '20

Hello, network-scripts for host networking were deprecated since oVirt 4.4. It will be removed completely in the 4.4.3 release. There is no action required for setups that did not change the configuration to use network-scripts backend (net_nmstate_enabled = false). Users that did disable nmstate should redeploy all affected hosts before 4.4.3. Also can you please tell us what was the reason to use network-scripts, if that is the case? Thank you. Best regards, Ales Musil -- Ales Musil Software Engineer - RHV Network Red Hat EMEA <https://www.redhat.com> amusil(a)redhat.com IM: amusil <https://red.ht/sig>

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Random hosts disconnects
by Anton Louw 16 Sep '20

16 Sep '20

Hi All, I have a strange issue in my oVirt environment. I currently have a standalone manager which is running in VMware. In my oVirt environment, I have two Data Centers. The manager is currently sitting on the same subnet as DC1. Randomly, hosts in DC2 will say "Not Responding" and then 2 seconds later, the hosts will activate again. The strange thing is, when the manager was sitting on the same subnet as DC2, hosts in DC1 will randomly say "Not Responding" I have tried going through the logs, but I cannot see anything out of the ordinary regarding why the hosts would drop connection. I have attached the engine.log for anybody that would like to do a spot check. Thanks Anton Louw Cloud Engineer: Storage and Virtualization ______________________________________ D: 087 805 1572 | M: N/A A: Rutherford Estate, 1 Scott Street, Waverley, Johannesburg anton.louw(a)voxtelecom.co.za www.vox.co.za

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