March 2022 - Users - oVirt List Archives

NFS Synology NAS (DSM 7)
by Maton, Brett 08 Mar '22

08 Mar '22

Hi List, I can't get oVirt 4.4.8.5-1.el8 (running on oVirt Node hosts) to connect to an NFS share on a Synology NAS. I gave up trying to get the hosted engine deployed and put that on an iscsi volume instead... The directory being exported from NAS is owned by vdsm / kvm (36:36) perms I've tried: 0750 0755 0777 Tried auto / v3 / v4_0 As others have mentioned regarding NFS, if I connect manually from the host with mount nas.mydomain.com:/volume1/ov_nas It connects and works just fine. If I try to add the share as a domain in oVirt I get Operation Cancelled Error while executing action Add Storage Connection: Permission settings on the specified path do not allow access to the storage. Verify permission settings on the specified storage path. When tailing /var/log/messages on When tailing /var/log/messages on the oVirt host, I see this message appear (I changed the domain name for this post so the dots might be transcoded in reality): Aug 27 17:36:07 ov001 systemd[1]: rhev-data\x2dcenter-mnt-nas.mydomain.com:_volume1_ov__nas.mount: Succeeded. The NAS is running the 'new' DSM 7, /etc/exports looks like this: /volume1/ov_nas x.x.x.x(rw,async,no_root_squash,anonuid=36,anongid=36) (reloaded with exportfs -ra) Any suggestions appreciated. Regards, Brett

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Import an snapshot of an iSCSI Domain
by Vinícius Ferrão 07 Mar '22

07 Mar '22

Hello, I need to import an old snapshot of my Data domain but oVirt does not find the snapshot version when importing on the web interface. To be clear, I’ve mounted a snapshot on my storage, and exported it on iSCSI. I was expecting that I could be able to import it on the engine. On the web interface this Import Pre-Configured Domain finds the relative IQN but it does not show up as a target. Any ideas?

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Preparing for next week 4.5.0 Alpha test day
by Sandro Bonazzola 07 Mar '22

07 Mar '22

Hi, 4.5.0 Alpha is coming next week! As for oVirt 4.4 test day we have a trello board at https://trello.com/b/3FZ7gdhM/ovirt-450-test-day . For reference, the 4.4 trello board is at https://trello.com/b/5ZNJgPC3/ovirt-440-test-day If you have troubles accessing the trello board please let me know. If you have a better idea on how to coordinate the next 4.5.0 beta test day (too late for 4.5.0 alpha) I'm open to suggestions. A release management draft page has been created at: https://www.ovirt.org/release/4.5.0/ If you're willing to help testing the release during the test days please join the oVirt development mailing list at https://lists.ovirt.org/archives/list/devel@ovirt.org/ and report your feedback there. Please join the trello board for sharing what you're going to test so others can focus on different areas not covered by your test. If you don't want to register to trello, please share on the oVirt development mailing list and we'll add it to the board. The board is publicly visible also to non-registered users. Instructions for installing oVirt 4.5.0 Alpha and oVirt 4.5.0 Beta for testing will be added to the release page https://www.ovirt.org/release/4.5.0/ when the corresponding version will be released. Professional Services, Integrators and Backup vendors: please plan a test session against your additional services, integrated solutions, downstream rebuilds, backup solution accordingly. If you're not listed here: https://ovirt.org/community/user-stories/users-and-providers.html consider adding your company there. If you're willing to help updating the localization for oVirt 4.5.0 please follow https://ovirt.org/develop/localization.html If you're willing to help promoting the oVirt 4.5.0 release you can submit your banner proposals for the oVirt home page and for the social media advertising at https://github.com/oVirt/ovirt-site/issues As an alternative please consider submitting a case study as in https://ovirt.org/community/user-stories/user-stories.html Feature owners: please start planning a presentation of your feature for oVirt Youtube channel: https://www.youtube.com/c/ovirtproject If you have some new feature requiring community feedback / testing please add your case under the "Test looking for volunteer" section. Do you want to contribute to getting ready for this release? Read more about oVirt community at https://ovirt.org/community/ and join the oVirt developers https://ovirt.org/develop/ -- Sandro Bonazzola MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV Red Hat EMEA <https://www.redhat.com/> sbonazzo(a)redhat.com <https://www.redhat.com/> *Red Hat respects your work life balance. Therefore there is no need to answer this email out of your office hours.*

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VM hanging at sustained high throughput
by David Johnson 07 Mar '22

07 Mar '22

Hi ovirt gurus, This is an interesting issue, one I never expected to have. When I push high volumes of writes to my NAS, I will cause VM's to go into a paused state. I'm looking at this from a number of angles, including upgrades on the NAS appliance. I can reproduce this problem at will running a centos 7.9 VM on Ovirt 4.5. *Questions:* 1. Is my analysis of the failure (below) reasonable/correct? 2. What am I looking for to validate this? 3. Is there a configuration that I can set to make it a little more robust while I acquire the hardware to improve the NAS? *Reproduction:* Standard test of file write speed: [root@cen-79-pgsql-01 ~]# dd if=/dev/zero of=./test bs=512k count=4096 oflag=direct 4096+0 records in 4096+0 records out 2147483648 bytes (2.1 GB) copied, 1.68431 s, 1.3 GB/s Give it more data [root@cen-79-pgsql-01 ~]# dd if=/dev/zero of=./test bs=512k count=12228 oflag=direct 12228+0 records in 12228+0 records out 6410993664 bytes (6.4 GB) copied, 7.22078 s, 888 MB/s The odds are about 50/50 that 6 GB will kill the VM, but 100% when I hit 8 GB. *Analysis:* What I think appears to be happening is that the intent cache on the NAS is on an SSD, and my VM's are pushing data about three times as fast as the SSD can handle. When the SSD gets queued up beyond a certain point, the NAS (which places reliability over speed) says "Whoah Nellie!", and the VM chokes. *David Johnson*

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Re: [External] : Importing KVMs and QCOW
by Abe E 07 Mar '22

07 Mar '22

It seems the images I was given by the company are not working with OVIRT. OVA Import failed over GUI, the KVM Raw images failed to boot. I was able to take the ova though and convert it to a qcow image through the CLI and upload it to the GUI Disk page and attach it to my VM, that is when it actually showed a 150GB HDD with a 3GB actual size and it booted up. Thanks again For people googling : I used this https://www.tekbyte.net/how-to-convert-ova-image-to-qcow2-qemu-and-virt-man…

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Re: Best CPU topolgy for VMs (Socket / Core / Threads)
by Strahil Nikolov 07 Mar '22

07 Mar '22

As long as you keep inside the NUMA limits you should be OK.For example:1 core , 2 threads is equal to 2 cores, 1 thread eachAfter all, all VMs in KVM are just processes. Yet, if your server has 2 CPUs each with 6 cores ( 2 threads per core ) ,you should avoid setting VMs with 13 vCPUs (13 real threads) as you will have to use some of the threads on the second CPU. i think there is a guide for High Performance VMs where NUMA cases are described quite well. Best Regards,Strahil Nikolov On Mon, Mar 7, 2022 at 16:37, Laurent Duparchy<duparchy(a)esrf.fr> wrote: Thanks for your reply. So, no performance issue if the virtual topology does not match the physical one ? Laurent Duparchy ESRF - The European Synchrotron MIS Group 04 76 88 22 56 Strahil Nikolov wrote on 07/03/2022 15:10: I think it's most useful for licensing purposes -> like the Win10 example Best Regards, Strahil Nikolov Hi, Given the fact that there is the option to match de CPUs physical topology (Socket / Core / Threads) , I guess it can make a difference. When ? Linux vs Windows ? (One example I know is that Windows 10 won't access more than 4 sockets.) _______________________________________________ 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/5BN4OWEHKAYDN…

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Give direct internet access to Redhat RHVM/Ovirt Vms from an AWS bare metal host
by Eugène Ngontang 07 Mar '22

07 Mar '22

Hi, I’ve set up a *RHVM/Ovirt* host on AWS using a bare metal instance. Everything is working but now I would like to give a direct internet access to VMs created inside this host. Actually those VMs get to internet through a ssh forwarded squid proxy. I can’t find the way to set that direct internet access for underlying VMs. Please can one here advise or give me any good doc link? Best regards, Eugène NG -- LesCDN <http://lescdn.com> engontang(a)lescdn.com ------------------------------------------------------------ *Aux hommes il faut un chef, et au* * chef il faut des hommes!L'habit ne fait pas le moine, mais lorsqu'on te voit on te juge!*

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GlusterFS poor performance
by francesco＠shellrent.com 07 Mar '22

07 Mar '22

Hi all, I'm running a glusterFS setup v 8.6 with two node and one arbiter. Both nodes and arbiter are CentOS 8 Stream with oVirt 4.4. Under gluster I have a LVM thin partition. VMs running in this cluster have really poor write performance, when a test directly performend on the disk score about 300 MB/s dd test on host1: [root@ovirt-host1 tmp]# dd if=/dev/zero of=./foo.dat bs=256M count=1 oflag=dsync 1+0 records in 1+0 records out 268435456 bytes (268 MB, 256 MiB) copied, 0.839861 s, 320 MB/s dd test on host1 on gluster: [root@ovirt-host1 tmp]# dd if=/dev/zero of=/rhev/data-center/mnt/glusterSD/ovirt-host1:_data/foo.dat bs=256M count=1 oflag=dsync 1+0 records in 1+0 records out 268435456 bytes (268 MB, 256 MiB) copied, 50.6889 s, 5.3 MB/s Nontheless, the write results in a VM inside the cluster is a little bit faster (dd results vary from 15 MB/s to 60 MB/s) and this is very strange to me: root@vm1-ha:/tmp# dd if=/dev/zero of=./foo.dat bs=256M count=1 oflag=dsync; rm -f ./foo.dat 1+0 records in 1+0 records out 268435456 bytes (268 MB, 256 MiB) copied, 5.58727 s, 48.0 MB/s Here's the actual gluster configuration, I also applied some paramaters in /var/lib/glusterd/groups/virt as mentioned in other ovirt thread related I found. gluster volume info data Volume Name: data Type: Replicate Volume ID: 09b532eb-57de-4c29-862d-93993c990e32 Status: Started Snapshot Count: 0 Number of Bricks: 1 x (2 + 1) = 3 Transport-type: tcp Bricks: Brick1: ovirt-host1:/gluster_bricks/data/data Brick2: ovirt-host2:/gluster_bricks/data/data Brick3: ovirt-arbiter:/gluster_bricks/data/data (arbiter) Options Reconfigured: server.event-threads: 4 cluster.shd-wait-qlength: 10000 cluster.shd-max-threads: 8 cluster.server-quorum-type: server cluster.lookup-optimize: off cluster.locking-scheme: granular cluster.data-self-heal-algorithm: full cluster.choose-local: off client.event-threads: 4 performance.client-io-threads: on nfs.disable: on transport.address-family: inet storage.fips-mode-rchecksum: on storage.owner-uid: 36 storage.owner-gid: 36 features.shard: on performance.low-prio-threads: 32 performance.strict-o-direct: on network.remote-dio: off network.ping-timeout: 30 user.cifs: off performance.quick-read: off performance.read-ahead: off performance.io-cache: off cluster.eager-lock: enable The speed between two hosts is about 1Gb/s: [root@ovirt-host1 ~]# iperf3 -c ovirt-host2 -p 5002 Connecting to host ovirt-host2 port 5002 [ 5] local x.x.x.x port 58072 connected to y.y.y.y port 5002 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 112 MBytes 938 Mbits/sec 117 375 KBytes [ 5] 1.00-2.00 sec 112 MBytes 937 Mbits/sec 0 397 KBytes [ 5] 2.00-3.00 sec 110 MBytes 924 Mbits/sec 18 344 KBytes [ 5] 3.00-4.00 sec 112 MBytes 936 Mbits/sec 0 369 KBytes [ 5] 4.00-5.00 sec 111 MBytes 927 Mbits/sec 12 386 KBytes [ 5] 5.00-6.00 sec 112 MBytes 938 Mbits/sec 0 471 KBytes [ 5] 6.00-7.00 sec 108 MBytes 909 Mbits/sec 34 382 KBytes [ 5] 7.00-8.00 sec 112 MBytes 942 Mbits/sec 0 438 KBytes [ 5] 8.00-9.00 sec 111 MBytes 928 Mbits/sec 38 372 KBytes [ 5] 9.00-10.00 sec 111 MBytes 934 Mbits/sec 0 481 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 1.08 GBytes 931 Mbits/sec 219 sender [ 5] 0.00-10.04 sec 1.08 GBytes 926 Mbits/sec receiver iperf Done. Between nodes and arbiter about 200MB/s [ 5] local ovirt-arbiter port 45220 connected to ovirt-host1 port 5002 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 30.6 MBytes 257 Mbits/sec 1177 281 KBytes [ 5] 1.00-2.00 sec 26.2 MBytes 220 Mbits/sec 0 344 KBytes [ 5] 2.00-3.00 sec 28.8 MBytes 241 Mbits/sec 15 288 KBytes [ 5] 3.00-4.00 sec 26.2 MBytes 220 Mbits/sec 0 352 KBytes [ 5] 4.00-5.00 sec 30.0 MBytes 252 Mbits/sec 32 293 KBytes [ 5] 5.00-6.00 sec 26.2 MBytes 220 Mbits/sec 0 354 KBytes [ 5] 6.00-7.00 sec 30.0 MBytes 252 Mbits/sec 32 293 KBytes [ 5] 7.00-8.00 sec 27.5 MBytes 231 Mbits/sec 0 355 KBytes [ 5] 8.00-9.00 sec 28.8 MBytes 241 Mbits/sec 30 294 KBytes [ 5] 9.00-10.00 sec 26.2 MBytes 220 Mbits/sec 3 250 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 281 MBytes 235 Mbits/sec 1289 sender [ 5] 0.00-10.03 sec 277 MBytes 232 Mbits/sec receiver iperf Done. I definitely missing something obvious and I'm not a gluster/ovirt black bealt... Can anyone point me to the right way? Thank you for your time. Regards, Francesco

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Best CPU topolgy for VMs (Socket / Core / Threads)
by duparchy＠esrf.fr 07 Mar '22

07 Mar '22

Hi, Given the fact that there is the option to match de CPUs physical topology (Socket / Core / Threads) , I guess it can make a difference. When ? Linux vs Windows ? (One example I know is that Windows 10 won't access more than 4 sockets.)

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Hosted Engine deployment looks stuck in startup during the deployment
by Eugène Ngontang 07 Mar '22

07 Mar '22

Hi, I'm using an aws ec2 bare metal install to deploy RHV-M in order to create and test NVidia GPU VMs. I'm trying to deploy a self hosted engine version 4.4. I've setup everything till the hosted-engine deployment and Hosted Engine deployment looks like stuck at engine host startup, and times out many more hours after. I'm suspecting networking startup issue but can really and clearly identify the issue. Because during all this time the deployment process is waiting for the hosted engine to come up before it finishes, the hosted engine itself is up and running, is still running till now, but is not reachable. Here attached you will find : - A screenshot before the timeout - A screenshot after the timeout (fail) - The answer file I appended to the hosted-engine command > hosted-engine --deploy --4 --config-append=hosted-engine.conf - The deployment log output - The resulting answer file after the deployment. I think the problem would I think the problem would at the network startup step but as I don't have any explicit error/failure message, I can't tell. Please can someone here advise? Please let me know if you need any more information from me. Best regards, Eugène NG Best regards, Eugène NG -- LesCDN <http://lescdn.com> engontang(a)lescdn.com ------------------------------------------------------------ *Aux hommes il faut un chef, et au* * chef il faut des hommes!L'habit ne fait pas le moine, mais lorsqu'on te voit on te juge!*

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