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better understand ovirt-engine functions
by stuartk＠alleninstitute.org 07 Aug '18

07 Aug '18

I've been reading through documentation https://www.ovirt.org/documentation/architecture/architecture/ https://www.ovirt.org/documentation/self-hosted/Self-Hosted_Engine_Guide/ But am struggling still to understand the role ovirt-engine plays. Would anyone have recommends for additional reads? The problem I'm tackling currently looks like this: - We have (2) oVirt Data Centers, each populated by a single Cluster. The Data Centers are physically & network-wise 'distant' from one another - hosted-engine runs on (3) of the (4) Hosts in Data Center A / Cluster A. hosted-engine does not run on Data Center B / Cluster B - When we disrupt network connectivity around Cluster A (yes, that's Cluster *A*), Hosts in Cluster B crash (requiring a power cycle) and Guests in Cluster B get stopped and paused I'm struggling to understand why mussing with Cluster A affects Cluster B. From pcaps, I can see plenty of TLS traffic from Cluster A's Hosts -- presumably from ovirt-engine running on Cluster A -- exchanged with Cluster B. So, during my last maintenance window, I put hosted-engine into maintenance mode ... but Hosts/VMs in Cluster B were still affected. Where do I go to better understand what ovirt-engine does when it is 'managing' Hosts & VMs? --sk

3 6

Datacenter of several Hosts with Local Storage ? (share Logical Network)
by jeanbaptiste＠nfrance.com 07 Aug '18

07 Aug '18

Hello, My question is pretty simple :) Is there a way to configure Local(s) Storage Datacenter with more than 1 host ? The goal is is to share some Datacenter simple parameters between several hosts (with Local storage) like Logical Networks ? If it is not possible what is the best way / workaound to do this ? To compare, on Xenserver, it is possible to configure a "Pool" of some hosts which have Local Storage, but which share same Logical network configuration.. (I do not say XS is better^^, far from it !) Thanks for all :) Jean-Baptiste

2 2

MoM - Not working ? How to use it ?
by jeanbaptiste＠nfrance.com 07 Aug '18

07 Aug '18

Hello, I'm trying to test Memory balloon useful functionality, but l'm unable to make it work successfuly. Firstly, I enable the MOM on my Cluster: Memory Balloon Enable Memory Balloon Optimization Secondly, I configure a VM virtual machine like this: On system tab: Memory Size : 28672 MB Maximum memory : 28672 MB On Ressource allocation tab: Memory Allocation: Physical Memory Guaranteed : 2048 MB Memory Balloon Device: Enabled Thirdly, I test 1- I boot the VM. After boot VM consume 200MB 2- I lauch perl program which consume 26GB. 3- During this, Host RAM usage is near 90% 4- I stop the perl program, and on guest side, RAM usage drop down to 200Mo 5- On host side, RAM usage keep to 24 - 26GB. I wait some time to show if the qemu-vm process drop is host-ram-usage. Ram usage keep to 24GB. 6- I try to launch another VM like the first one (but with 8GB RAM and 2GB Guaranteed) , on the host (to "force" Mom ?) but I'm unable to lauch it, Host free mem is insufficient I change MoM log to debug to show something: 2018-07-31 11:49:31,887 - mom.RPCServer - INFO - ping() 2018-07-31 11:49:31,888 - mom.RPCServer - INFO - getStatistics() 2018-07-31 11:49:31,888 - mom.Monitor - DEBUG - Field 'mem_free' not known. Ignoring. 2018-07-31 11:49:43,313 - mom.VdsmRpcBase - DEBUG - VM List: [u'9632443f-d302-43f7-a279-778e64ee98f4'] 2018-07-31 11:49:43,465 - mom.VdsmRpcBase - DEBUG - Memory stats: {'swap_out': 0, 'swap_usage': 0, 'mem_free': 28221020, 'major_fault': 0, 'swap_in': 0, 'swap_total': 0, 'mem_available': 28650472, 'minor_fault': 99, 'mem_unused': 28221020} 2018-07-31 11:49:43,468 - mom.Monitor - DEBUG - Collector <mom.Collectors.GuestIoTuneOptional.GuestIoTuneOptional instance at 0x167de18> did not return any data 2018-07-31 11:49:43,931 - mom.RPCServer - INFO - ping() 2018-07-31 11:49:43,932 - mom.RPCServer - INFO - getStatistics() 2018-07-31 11:49:43,932 - mom.Monitor - DEBUG - Field 'mem_free' not known. Ignoring. 2018-07-31 11:49:44,258 - mom.Monitor - DEBUG - Field 'mem_free' not known. Ignoring. 2018-07-31 11:49:44,284 - mom.Evaluator - DEBUG - debug: ('No shared pages, setting ksm_merge_across_nodes to', 1) 2018-07-31 11:49:44,286 - mom.Evaluator - DEBUG - debug: ('entry: apply_NUMA_policy',) 2018-07-31 11:49:44,286 - mom.Evaluator - DEBUG - debug: (1, '=ksm_merge_across_nodes ACTUAL from kernel') 2018-07-31 11:49:44,286 - mom.Evaluator - DEBUG - debug: (1, '=ksmMergeAcrossNodes REQUIRED from oVirt-engine') 2018-07-31 11:49:44,289 - mom.Evaluator - DEBUG - debug: ('exit: apply_NUMA_policy return_value = ', 0) 2018-07-31 11:49:44,310 - mom.Policy - DEBUG - Results: [0, 1, 1, 1, 0, 1, 1, 0.2, 0.05, 0.2, 0.05, 0.0025, 'change_big_enough', 'shrink_guest', 'grow_guest', 0.22506353015141964, 'balloon_logic', [0], 'guest_qos', [0], 300, -50, 64, 1250, 10, 0.2, 'change_npages', 'apply_NUMA_policy', 6550590.4, 30058208, None, 0, 0, None, -1, 100000, 'check_and_set_quota', 'reset_quota_and_period', [None], 0, 'set_io_limits', 'reset_io_limits', [0]] Does I miss something ? MoM behavior ? Thanks for all !

3 9

Tuning and testing GlusterFS performance
by Jayme 07 Aug '18

07 Aug '18

So I've finally completed my first HCI build using the below configuration: 3x Dell PowerEdge R720 2x 2.9 GHz 8 Core E5-2690 256GB RAM 2x250gb SSD Raid 1 (boot/os) 2x2TB SSD jbod passthrough (used for gluster bricks) 1Gbe Nic for management 10Gbe nic for Gluster Using Replica 3 with no arbiter. Installed the latest version of oVirt available at the time 4.2.5. Created recommended volumes (with an additional data volume on second SSD). Not using VDO First thing I did was setup glusterFS network on 10Gbe and set it to be used for glusterFS and migration traffic. I've setup a single test VM using Centos7 minimal on the default "x-large instance" profile. Within this VM if I do very basic write test using something like: dd bs=1M count=256 if=/dev/zero of=test conv=fdatasync I'm seeing quite slow speeds, only 8mb/sec. If I do the same from one of the hosts gluster mounts i.e. host1: /rhev/data-center/mnt/glusterSD/HOST:data I get about 30mb/sec (which still seems fairly low?) Am I testing incorrectly here? Is there anything I should be tuning on the Gluster volumes to increase performance with SSDs? Where can I find out where the bottle neck is here, or is this expected performance of Gluster?

4 23

Unable to login to the WEB UI Unexpected character ('<' (code 60))....
by sylvain.palous＠gmail.com 07 Aug '18

07 Aug '18

Hi, I installed oVirt on my local server, and trying to login to the web UI from another computer on the same local network. No DNS server. Unfortunaly i'm getting this error : Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') at [Source: java.io.StringReader@29cf6878; line: 1, column: 2] In ovirt-provider-ovn.log, i get this error : File "/usr/share/ovirt-provider-ovn/auth/plugins/ovirt/sso.py", line 47, in wrapper raise BadGateway(e) BadGateway: ('Connection aborted.', gaierror(-2, 'Name or service not known')) In ovirt-engine.log : 2018-08-05 16:49:33,594+02 ERROR [org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-83) [40e9406d] Command 'org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand' failed: EngineException: (Failed with error Bad Gateway and code 5050) 2018-08-05 16:49:33,645+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engineScheduled-Thread-83) [40e9406d] EVENT_ID: PROVIDER_SYNCHRONIZED_FAILED(216), Failed to synchronize networks of Provider ovirt-provider-ovn. Boot.log looks ok Trying to understand this fix : https://bugzilla.redhat.com/show_bug.cgi?id=1336838 1. Which certificates i have to install ? 2. Configure HTTPS certificate in Apache : How ? Thanks for your help. Halsk

4 16

disk_vm_element ERROR: duplicate key value violates unique constraint "pk_disk_vm_element"
by Punaatua PK 06 Aug '18

06 Aug '18

Hello, when i tried to attach a snapshot disk into my backupvm. oVirt doesn't want to attach it. In the engine.log I can see this. 2018-08-04 19:20:04,472-10 ERROR [org.ovirt.engine.core.bll.storage.disk.AttachDiskToVmCommand] (default task-33) [646ad7a1-4501-4648-a937-bbee0abaec46] Command 'org.ovirt.engine.core.bll.storage.disk.AttachDiskToVmCommand' failed: CallableStatementCallback; SQL [{call insertdiskvmelement(?, ?, ?, ?, ?, ?)}]; ERROR: duplicate key value violates unique constraint "pk_disk_vm_element" Detail: Key (vm_id, disk_id)=(78ef239f-3cb3-4eef-921f-f989724009ef, c7cef731-e31d-4597-80f1-1f2393cd66ea) already exists. Where: SQL statement "INSERT INTO disk_vm_element ( disk_id, vm_id, is_boot, pass_discard, disk_interface, is_using_scsi_reservation) VALUES ( v_disk_id, v_vm_id, v_is_boot, v_pass_discard, v_disk_interface, v_is_using_scsi_reservation)" PL/pgSQL function insertdiskvmelement(uuid,uuid,boolean,boolean,character varying,boolean) line 3 at SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "pk_disk_vm_element" Detail: Key (vm_id, disk_id)=(78ef239f-3cb3-4eef-921f-f989724009ef, c7cef731-e31d-4597-80f1-1f2393cd66ea) already exists. When i SQL the database, the entries is present (and many other). But in the webinterface, I can't see them on the backupVM. It's just like ovirt didn't delete old entries engine=# select * from disk_vm_element where vm_id = '78ef239f-3cb3-4eef-921f-f989724009ef' and disk_id = 'c7cef731-e31d-4597-80f1-1f2393cd66ea' ; disk_id | vm_id | is_boot | disk_interface | is_using_scsi_reservation | pass_discard --------------------------------------+--------------------------------------+---------+----------------+---------------------------+-------------- c7cef731-e31d-4597-80f1-1f2393cd66ea | 78ef239f-3cb3-4eef-921f-f989724009ef | f | VirtIO | f | f (1 row) Do you guys have any idea on how to correct this ? Is there any function to update / refresh this table ? I dont want to delete entries by sql as i don't know the consequences, is it safe to delete entries ? Thank you for your help

2 4

Re: VirtIO in new upgraded 4.2.5 for FreeBSD is very poor (could not use)
by Karli Sjöberg 05 Aug '18

05 Aug '18

2 1

Installation Help
by bilal.ahmed＠kfueit.edu.pk 05 Aug '18

05 Aug '18

Dear Sir I have successfully installed the ovirt engine and ovirt node separately on two machines and I have accessed their web portals as well . But I am facing a problem in its initial configuration that I am unable to add a host and its installation fails . I am using default data center and default cluster . Could you please guide what can be the issue , credentials are correct . I have tried to add both the ovirt engine and ovirt node as a host but failed. Bilal Ahmad Network Administrator Cell: +92 333 7451870 | Tel: +92 68 5882400 | Ext. 2499 www.kfueit.edu.pk <http://www.kfueit.edu.pk> <http://www.kfueit.edu.pk/> -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

2 1

Re: [ovirt-devel] Is ovirt support node HA?
by Greg Sheremeta 05 Aug '18

05 Aug '18

Yes, HA is supported. These should help: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/ht… https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/ht… Best wishes, Greg On Sun, Aug 5, 2018 at 3:03 AM pengyixiang <yxpengi386(a)163.com> wrote: > Is ovirt support node HA? How did they works? Is there any document about > this? like one node down, we fence this down node, and startup these vms in > others active node. > > Cheers， > Pencc > > _______________________________________________ > Devel mailing list -- devel(a)ovirt.org > To unsubscribe send an email to devel-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/devel@ovirt.org/message/PL2CJQPP7DEJF… > -- GREG SHEREMETA SENIOR SOFTWARE ENGINEER - TEAM LEAD - RHV UX Red Hat NA <https://www.redhat.com/> gshereme(a)redhat.com IRC: gshereme <https://red.ht/sig>

1 0

Re: VirtIO in new upgraded 4.2.5 for FreeBSD is very poor (could not use)
by Karli Sjöberg 05 Aug '18

05 Aug '18

2 1