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Re: Ovirt gluster arbiter within hosted VM
by Strahil 20 Apr '19

20 Apr '19

With GlusterD2 , you can use thin arbiter - which can be deployed in the cloud. Do not try to setup regular arbiter far away from the data bicks or yoir performance will be awful. Best Regards, Strahil NikolovOn Apr 19, 2019 13:28, Alex K <rightkicktech(a)gmail.com> wrote: > > > > On Fri, Apr 19, 2019 at 1:14 PM Scott Worthington <scott.c.worthington(a)gmail.com> wrote: >> >> And where, magically, is that node's storage going to live? > > In the disk of the VM. Let me know if I need to clarify further. >> >> >> You can't fake a proper setup of gluster. > > Not trying to fake it. Trying to find a solution with the available options. >> >> >> On Fri, Apr 19, 2019, 5:00 AM Alex K <rightkicktech(a)gmail.com> wrote: >>> >>> Hi all, >>> >>> I have a two node hyper-converged setup which are causing me split-brains when network issues are encountered. Since I cannot add a third hardware node, I was thinking to add a dedicated guest VM hosted in same hyper-converged cluster which would do the arbiter for the volumes. >>> >>> What do you think about this setup in regards to stability and performance? >>> I am running ovirt 4.2. >>> >>> Thanx, >>> Alex >>> _______________________________________________ >>> Users mailing list -- users(a)ovirt.org >>> To unsubscribe send an email to users-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/users@ovirt.org/message/LTDOAMBKVE5BP…

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Re: Ovirt gluster arbiter within hosted VM
by Strahil 20 Apr '19

20 Apr '19

As long as the VM is not hosted by those 2 hyperconverged nodes - there should be no problem. Another option is a small machine with a single SSD. I'm using Lenovo Tiny M-series as an arbiter. Best Regards, Strahil NikolovOn Apr 19, 2019 12:59, Alex K <rightkicktech(a)gmail.com> wrote: > > Hi all, > > I have a two node hyper-converged setup which are causing me split-brains when network issues are encountered. Since I cannot add a third hardware node, I was thinking to add a dedicated guest VM hosted in same hyper-converged cluster which would do the arbiter for the volumes. > > What do you think about this setup in regards to stability and performance? > I am running ovirt 4.2. > > Thanx, > Alex

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Replica 3 distribute-replicated - data placement and fault tolerance
by Leo David 19 Apr '19

19 Apr '19

Hello Everyone, I did some fio performance tests on a particular vm and I have noticed things that I do not understand regarding how data is placed along the bricks. I am sure this is a lack of knowledge, but I would really appreciate any help in understanding this, I did a bit of research on the internet, but just could't find something relevant. I have one replica 3 distributed-replicated arbitrated volume, across 18 bricks ( 9 nodes, 2 jbods per node ). The volume was created as: node1 - brick1, node-2, brick1,.....node9-brick1, node1 - brick2, node-2, brick2,.....node9-brick2 As far as i've understood, under the hood there are sets of 3 times replicated data ( subvolumes ) which are assigned to the first 3 bricks, next set of replicated data to the next set of 3 bricks, and so on.. Now, I have this testing vm runign one node one. When I've started the fio test, i've noticed incresed gluster traffic from node 1 to node2,4 and 5 So I assumed that the vm disk is data resides on a subvolume allocated to bricks from these hosts. Then I have migrated the vm on node 2, and did the same test. Now the increased treffic is generated from node2 to node1, 4, and 5.. What I do not understand is: - why gluster client ( ovirt host ) is sending data to 3 bricks if the volume is arbitrated - shouldn't it send only to 2 of them ? - why are there 4 brick implicated in this subvolume - what would it be the fault tolerance level in this setup ,ie: how many hosts can I take down and still having the volume serving IO requests; can they be random ? I am sorry for my lack of knowledge, I am just trying to understand what is happening so I can deploy a decent proper setup of an hci environment. Thank you, Leo -- Best regards, Leo David

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Re: Ovirt gluster arbiter within hosted VM
by Alex K 19 Apr '19

19 Apr '19

On Fri, Apr 19, 2019 at 1:14 PM Scott Worthington < scott.c.worthington(a)gmail.com> wrote: > And where, magically, is that node's storage going to live? > In the disk of the VM. Let me know if I need to clarify further. > > You can't fake a proper setup of gluster. > Not trying to fake it. Trying to find a solution with the available options. > > On Fri, Apr 19, 2019, 5:00 AM Alex K <rightkicktech(a)gmail.com> wrote: > >> Hi all, >> >> I have a two node hyper-converged setup which are causing me split-brains >> when network issues are encountered. Since I cannot add a third hardware >> node, I was thinking to add a dedicated guest VM hosted in same >> hyper-converged cluster which would do the arbiter for the volumes. >> >> What do you think about this setup in regards to stability and >> performance? >> I am running ovirt 4.2. >> >> Thanx, >> Alex >> _______________________________________________ >> Users mailing list -- users(a)ovirt.org >> To unsubscribe send an email to users-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/users@ovirt.org/message/LTDOAMBKVE5BP… >> >

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Ovirt gluster arbiter within hosted VM
by Alex K 19 Apr '19

19 Apr '19

Hi all, I have a two node hyper-converged setup which are causing me split-brains when network issues are encountered. Since I cannot add a third hardware node, I was thinking to add a dedicated guest VM hosted in same hyper-converged cluster which would do the arbiter for the volumes. What do you think about this setup in regards to stability and performance? I am running ovirt 4.2. Thanx, Alex

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Ovirt-engine self hostd
by Dennis Perfors 19 Apr '19

19 Apr '19

Hi, We have build Ovirt-engine self hosted. We have created 2 vlans 1 services and 1 student. This works good. Services vlan 192.168.60.0/24 gateway ip 192.168.60.1 on this card Student vlan 192.168.10.0/24 gateway ip 192.168.10.1 on this network card Everything seems to be oke, but the probem is on the vlan. On the node 192.168.60.3, there is no internet connection when we do yum update -y But there is no internet connection on the host. I cant do yum update -y or do anything else. Here more information: ^Chttp://mirror.cj2.nl/centos/7.6.1810/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#56 - "Callback aborted" Trying other mirror. ^Chttp://mirror.sitbv.nl/centos/7.6.1810/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#56 - "Callback aborted" Trying other mirror. http://mirror.serverius.net/centos/7.6.1810/extras/x86_64/repodata/repomd.x…: [Errno 14] curl#7 - "Failed to connect to 2a03:3f40:1::15: Network is unreachable" [root@bastion ~]# ping nu.nl PING nu.nl (52.85.140.48) 56(84) bytes of data. 64 bytes from server-52-85-140-48.man50.r.cloudfront.net (52.85.140.48): icmp_seq=1 ttl=241 time=12.8 ms ^C [root@bastion ~]# ping alibabia.com PING alibabia.com (137.175.26.243) 56(84) bytes of data. 64 bytes from 137.175.26.243 (137.175.26.243): icmp_seq=1 ttl=115 time=144 ms 64 bytes from 137.175.26.243 (137.175.26.243): icmp_seq=2 ttl=115 time=144 ms ^C ipv4.method: manual ipv4.dns: 1.1.1.1 ipv4.dns-search: -- ipv4.dns-options: "" ipv4.dns-priority: 0 ipv4.addresses: 192.168.60.3/24 ipv4.gateway: 192.168.60.1 ipv4.routes: -- ipv4.route-metric: -1 ipv4.route-table: 0 (unspec) ipv4.ignore-auto-routes: no ipv4.ignore-auto-dns: no public (active) target: default icmp-block-inversion: no interfaces: ovirtmgmt sources: services: ssh dhcpv6-client ovirt-postgres ovirt-https ovn-central-firewall-service ovirt-fence-kdump-listener ovirt-imageio-proxy ovirt-websocket-proxy ovirt-http ovirt-vmconsole-proxy ovirt-provider-ovn https http cockpit libvirt-tls snmp vdsm ovirt-imageio ovirt-vmconsole ports: 9986/tcp 22/tcp 6081/udp 6100/tcp protocols: masquerade: yes forward-ports: port=1337:proto=tcp:toport=22:toaddr=192.168.60.3 port=80:proto=tcp:toport=80:toaddr=192.168.60.5 source-ports: icmp-blocks: rich rules: rule family="ipv4" source address="0.0.0.0/24" accept [root@athena ~]# Portfowarding also works to the host 192.168.60.3. so that is no poiint. But only traffic from the insidehost to outside is not working. Thanks

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Rebrandind Problems
by siovelrm＠gmail.com 19 Apr '19

19 Apr '19

hello I made a rebranding of my ovirt 4.3.2, but something went wrong and I saved it from the original incorrectly without realizing it. Please I need the original "ovirt.brand" and "ovirt" directories when ovirt 4.3.2 is installed. Where can I get them to be able to restore them? Greetings

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Re: Expand existing gluster storage in ovirt 4.2/4.3
by Strahil 18 Apr '19

18 Apr '19

Recently , it was discussed in the mailing lists and dev mentioned that distributed replicated volumes are not officially supported, but some users use them. Even if not supported, it still should work without issues.If you think not to go this way, you can create a new 3 node cluster which will be fully suppported. Otherwise, if you go towards replicated distributed volumes , you just need to provide another set of 3 bricks and once added you can rebalance in order to distribute the files accross the sets. Here is an old thread that describes it for replica 2 volume types: https://lists.gluster.org/pipermail/gluster-users/2011-February/006599.html I guess I have confused you with my last e-mail, but that was not intentionable. Best Regards, Strahil NikolovOn Apr 17, 2019 17:13, adrianquintero(a)gmail.com wrote: > > Hi Strahil, > I had a 3 node Hyperconverged setup and added 3 new nodes to the cluster for a total of 6 servers. I am now taking advantage of more compute power, however the gluster storage part is what gets me. > > Current Hyperconverged setup: > - host1.mydomain.com > Bricks: > engine > data1 > vmstore1 > - host2.mydomain.com > Bricks: > engine > data1 > vmstore1 > - host3.mydomain.com > Bricks: > engine > data1 > vmstore1 > > - host4.mydomain.com > Bricks: > > - host5.mydomain.com > Bricks: > > - host6.mydomain.com > Bricks: > > > As you can see from the above, the original first 3 servers are the only ones that contain the gluster storage bricks, so storage redundancy is not set across all 6 nodes. I think it is a lack of understanding from my end on how ovirt and gluster integrate with one another so have a few questions: > > How would I go about achieving storage redundancy across all nodes? > Do I need to configure gluster volumes manually through the OS CLI? > If I configure the fail storage scenario manually will oVirt know about it? > > Again I know that the bricks must be added in sets of 3 and per the first 3 nodes my gluster setup looks like this (all done by hyperconverged seup in ovirt): > engine volume: host1:brick1, host2:brick1, host3:brick1 > data1 volume: host1:brick2, host2:brick2, host3:brick2 > vmstore1 volume: host1:brick3, host2:brick3, host3:brick3 > > So after adding the 3 new servers I dont know if I need to do something similar to the example in https://medium.com/@tumballi/scale-your-gluster-cluster-1-node-at-a-time-62…, if I do a similar change will oVirt know about it? will it be able to handle it as hyperconverged? > > As I mentioned before I normally see 3 node hyperconverged setup examples with gluster but have not found one for 6, 9 or 12 node cluster. > > Thanks again. > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-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/users@ovirt.org/message/U5T7TCSP4HFB2…

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Ovirt Host Replacement/Rebuild
by Jim Kusznir 18 Apr '19

18 Apr '19

Hi all: I had an unplanned power outage (generator failed to start, power failure lasted 3 min longer than UPS batteries). One node didn't survive the unplanned power outage. By that, I mean it kernel panic's on boot, and I haven't been able to capture the KP or the first part of it (just the end), and so I don't truely know what the root cause is. I have validated the hardware is just fine, so its got to be an OS corruption. Based on this, I was thinking that perhaps the easiest way to recover would simply be to delete the host from the cluster, reformat and reinstall this host, and then add it back to the cluster as a new host. Is this in fact a good idea? Are there any references to how to do this (the detailed steps so I don't mess it up)? My cluster is (was) a 3 node hyperconverged cluster with gluster used for the management node. I also have a gluster share for VMs, but I use an NFS share from a NAS for that (which I will ask about in another post). Thanks for the help! --Jim

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Importing existing GlusterFS
by Zryty ADHD 18 Apr '19

18 Apr '19

Hi, I have a questiion about that. I Install Ovirt 4.3.3 on Rhel 7.6 and want to import my existing GlusterFs cluster to it but i can't find option to do that. Can anyone explain me how to do that or its not possible in this version ?

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