[ovirt-users] Re: New to oVirt - Cluster questions
Hi Adam, The problem with replica2 volumes (1 copy on 1 server , 1 on the other) is that you may be in split-brain easily. Thus ovirt accepts only replica3 or replica2 arbiter1. If you have a small system with an SSD , then you can create your arbiter there. My lab has a Lenovo M-series for an arbiter. Guster (not talking about Glusterd2 here) will very soon support another feature called remote arbiter which will allow you to bring an arbiter in the cloud (or any other remote destination) and the latency will not cause any issues. Keep in mind that due to the nature of linux bonding/teaming it's better to have high bandwidth NIC vs multiple small ones ( 2 NICs x 10 gbit/s brings better performance vs 20 NICs x 1 gbit/s ). So, you need a 3rd node - no matter locally (regular arbiter or a full replica ) or remotely (remote arbiter). Of course for testing, you can still setup gluster (manually) in a replica2 volumes and use oVirt ability to use POSIX-compliant FS . This type of setup will not be supported and you won't be able to use the UI but you can still explore the oVirt project. Best Regards, Strahil NikolovOn Jun 15, 2019 20:57, adam.fasna...@gmail.com wrote: > > Hello, > > I just discovered oVirt, and before installing, I'm already a fan. I have a > question regarding the number of nodes needed for a cluster. My main end > goal, is to have HA, where I can have live migrations. I currently have 2 > nodes (2 Dell R630s) that have a ton of local SSD storage on them. Is it > possible to setup oVirt with just 2 nodes, and have an HA "hyper converged" > style cluster? > > I can't seem to find a solid answer for this question. I've read the > documentation, as well as consulted Google. I seem to get mixed answers. Is > this possible? > > Thank you! > ___ > Users mailing list -- users@ovirt.org > To unsubscribe send an email to users-le...@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/YRKWAAHN4EGPUWG7EMBZI2PWE5NF2PQ6/ ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/ODEDIMDPKTD43Y24GPFE6K6KK36KR2ZG/
[ovirt-users] Any one uses Nvidia T4 as vGPU in production?
Hello, any successful stories of the Nvidia T4 usage with the Ovirt? I was wondered if one would get 2 hosts each with T4s , are there live migrations possible? thanks, Arman ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/KVFNFU3YFO5CACZFT3TGLYIA6OLLGIKF/
[ovirt-users] Re: New to oVirt - Cluster questions
Ovirt can be installed on as little as one node ,but for a proper HA setup you should have at least three nodes. Hci uses gluster and needs a replica 3 or replica 3 arbiter 1 configuration. With arbiter you need less storage as it only holds metadata so you might be able to put a third server in your mix without having to spend a lot on storage for it. I would not attempt HA with anything less than three severs unless you are using external storage such as nfs. On Sat, Jun 15, 2019 at 3:42 PM wrote: > Hello, > > I just discovered oVirt, and before installing, I'm already a fan. I have > a question regarding the number of nodes needed for a cluster. My main end > goal, is to have HA, where I can have live migrations.I currently have > 2 nodes (2 Dell R630s) that have a ton of local SSD storage on them. Is > it possible to setup oVirt with just 2 nodes, and have an HA "hyper > converged" style cluster? > > I can't seem to find a solid answer for this question. I've read the > documentation, as well as consulted Google. I seem to get mixed answers. > Is this possible? > > Thank you! > ___ > Users mailing list -- users@ovirt.org > To unsubscribe send an email to users-le...@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/YRKWAAHN4EGPUWG7EMBZI2PWE5NF2PQ6/ > ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/3FGPT2TZ5IZFITYDBORGNNXMSMN2SHH4/
[ovirt-users] Re: New to oVirt - Cluster questions
It is my opinion that you never want fewer than 3. Somebody else may want to comment on what is actually possible.-- Original message--From: adam.fasnacht@gmail.comDate: Sat, Jun 15, 2019 1:41 PMTo: users@ovirt.org;Cc: Subject:[ovirt-users] New to oVirt - Cluster questionsHello, I just discovered oVirt, and before installing, I'm already a fan. I have a question regarding the number of nodes needed for a cluster. My main end goal, is to have HA, where I can have live migrations.I currently have 2 nodes (2 Dell R630s) that have a ton of local SSD storage on them. Is it possible to setup oVirt with just 2 nodes, and have an HA "hyper converged" style cluster? I can't seem to find a solid answer for this question. I've read the documentation, as well as consulted Google. I seem to get mixed answers. Is this possible? Thank you! ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/YRKWAAHN4EGPUWG7EMBZI2PWE5NF2PQ6/ ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/NUDB4HBX57O2PTFVSS27YOA4ES63VSRT/
[ovirt-users] New to oVirt - Cluster questions
Hello, I just discovered oVirt, and before installing, I'm already a fan. I have a question regarding the number of nodes needed for a cluster. My main end goal, is to have HA, where I can have live migrations.I currently have 2 nodes (2 Dell R630s) that have a ton of local SSD storage on them. Is it possible to setup oVirt with just 2 nodes, and have an HA "hyper converged" style cluster? I can't seem to find a solid answer for this question. I've read the documentation, as well as consulted Google. I seem to get mixed answers. Is this possible? Thank you! ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/YRKWAAHN4EGPUWG7EMBZI2PWE5NF2PQ6/
[ovirt-users] New to oVirt - Cluster questions
Hello, I just discovered oVirt, and before installing, I'm already a fan. I have a question regarding the number of nodes needed for a cluster. My main end goal, is to have HA, where I can have live migrations.I currently have 2 nodes (2 Dell R630s) that have a ton of local SSD storage on them. Is it possible to setup oVirt with just 2 nodes, and have an HA "hyper converged" style cluster? I can't seem to find a solid answer for this question. I've read the documentation, as well as consulted Google. I seem to get mixed answers. Is this possible? Thank you! ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/DLTIHSDDWH3RUWI3QZZP6SH6QPGQSJC3/
[ovirt-users] Cannot access dashboard after upgrading to 4.3.4
Hi all, I upgraded our installation from 4.2.8 to 4.3.4 and I am unable to access the dashboard in UI as there is only "Loading data..." displayed. There are postgres processes running on the engine taking 100% cpu. One is running for more than 14 hours: SELECT name, AVG(total) AS total, AVG(used) AS used, MAX(previous_used) AS previous_used, MAX(previous_total) AS previous_total, MAX(vm_disk_ usage_percent) AS usage_percent FROM (SELECT history_datetime, vms.vm_name AS name, SUM(vm_disk_size_mb) AS total, SUM(vm_disk_actual_size_mb) AS used, COALESCE(MAX(previous_actual_size), 0) AS previous_used, COALESCE(MAX(previous_total_size), 0) AS previous_total, CASE WHEN MAX(vm_disk_size_mb) = 0 THEN 0 ELSE (CAST(MAX(vm_disk_actual_size_mb) AS DECIMAL)/ MAX(vm_disk_size_mb) * 100) END AS vm_disk_usage_percent FROM v4_2_statistics_vms_disks_resources_usage_samples samples INNER JOIN v4_2_latest_configuration_vms_devices devices ON devices.device_id = vm_disk_id IN NER JOIN v4_2_latest_configuration_vms vms ON vms.vm_id = devices.vm_id INNER JOIN v4_2_latest_configuration_vms_disks disks ON disks.vm_disk_id = samples.vm_disk_id LEFT OUTER JOIN (SELECT v m_name, AVG(previous_actual_size) AS previous_actual_size, AVG(previous_total_size) AS previous_total_size FROM (SELEC 13783 | 2019-06-15 08:41:52.349769+02 | active | SELECT name, AVG(total) AS total, AVG(used) AS used, MAX(previous_used) AS previous_used, MAX(previous_total) AS previous_total, MAX(vm_disk_ usage_percent) AS usage_percent FROM (SELECT history_datetime, vms.vm_name AS name, SUM(vm_disk_size_mb) AS total, SUM(vm_disk_actual_size_mb) AS used, COALESCE(MAX(previous_actual_size), 0) AS previous_used, COALESCE(MAX(previous_total_size), 0) AS previous_total, CASE WHEN MAX(vm_disk_size_mb) = 0 THEN 0 ELSE (CAST(MAX(vm_disk_actual_size_mb) AS DECIMAL)/ MAX(vm_disk_size_mb) * 100) END AS vm_disk_usage_percent FROM v4_2_statistics_vms_disks_resources_usage_samples samples INNER JOIN v4_2_latest_configuration_vms_devices devices ON devices.device_id = vm_disk_id IN NER JOIN v4_2_latest_configuration_vms vms ON vms.vm_id = devices.vm_id INNER JOIN v4_2_latest_configuration_vms_disks disks ON disks.vm_disk_id = samples.vm_disk_id LEFT OUTER JOIN (SELECT v m_name, AVG(previous_actual_size) AS previous_actual_size, AVG(previous_total_size) AS previous_total_size FROM (SELEC... oVirt Engine is configured with 128 GB memory and 24 cores. Please advice how to adress this. Thank you and all the best, Oliver ___ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@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/JJWRQKGCIHRG765YJCEG5CV6BJTFPFAO/
