April 2017 - Users - oVirt List Archives

ISSUES WITH EDITING A CLUSTER SO IT CAN BE PART OF A NEW DATACENTER
by martin chamambo 18 Apr '17

18 Apr '17

I had issues with my master data storage domain and the only way was to set the hosts in maintenence mode ,delete the datacenter so i can recreate it.... I managed to delete the datacenter and the storage domains , and created a new datacenter , but now the existing clusters are not part of a datacenter and trying to add them to the datacenter gives out this error below Error while executing action: Cannot edit Cluster. Changing management network in a non-empty cluster is not allowed. and by non empty i guess it means there is a host inside that cluster ? fair enough trying to change a node cluster comes with the Host Cluster Dropdown with this Datacenter:Undefined How can i fix the catch 22 scenario without deleting clusters or hosts.. surely there should be a smarter way ?

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VDSM overwrites network config
by Alan Cowles 18 Apr '17

18 Apr '17

Hey guys, I'm in a lab setup currently with 2 hosts, running RHEV-3.5, with a self-hosted engine on RHEL 6.9 servers. I am doing this in order to plot out a production upgrade I am planning going forward to 4.0, and I'm a bit stuck and I'm hoping it's ok to ask questions here concerning this product and version. In my lab, I have many vlans trunked on my switchports, so I have to create individual vlan interfaces on my RHEL install. During the install, I am able to pick my ifcfg-eth0.502 interface for rhevm, and ifcfg-eth1.504 interface for NFS, access the storage and create my self-hosted engine. The issue I am running into is that I get into RHEV-M, and I am continuing to set the hosts up or add other hosts, when I go to move my NFS network to host2 it only allows me to select the base eth1 adapter, and not the VLAN tagged version. I am able to tag the VLAN in the RHEV-M configured network itself, but this has the unfortunate side effect of tagging a network on top of the already tagged interface on host1, taking down NFS and the self hosted engine. I am able to access the console of host1, and I configure the ifcfg files, vlan files, and bridge files to be on the correct interfaces, and I get my host back up, and my RHEV-M back up. However when I try to make these manual changes to host2 and get it up, the changes to these files are completely overwritten the moment the host reboots connected to vdsmd start-up. Right now, I have vdsmd disabled, and I have host2 configured the way I need it to be with the rhevm bridge on eth0.502, the NFS bridge on eth1.504, and my VMNet "guest" bridge on eth1.500, however that leaves me with a useless host from RHEV standards. I've checked several different conf files to see where vdsmd is pulling it's configuration from but I can't find it, or find a way to modify it to fit my needs. Any advice or pointers here would be greatly appreciated. Thank you all in advance. AC

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Latency threshold between Hosted Engine and Hosts
by FERNANDO FREDIANI 18 Apr '17

18 Apr '17

This is a multi-part message in MIME format. --------------D0FF4C4FF8B95B82C3141A34 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Hello. I have a Engine which is hosted in a optimal location for the people who access it and this Engine manage multiple Datacenters, some close by and some far away in terms of latency. What is the maximum latency advised between the Engine and the hosts for a healthy operation or that doesn't matter much as long the Engine can always reach the hosts ? Currently the maximum latency I have between Engine and Hosts is 110ms and sometimes when there is a non-optimal route latency goes up to 170ms. Should I be concerned about this ? Thanks Fernando --------------D0FF4C4FF8B95B82C3141A34 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body bgcolor="#FFFFFF" text="#000000"> <font face="arial, helvetica, sans-serif">Hello.<br> <br> I have a Engine which is hosted in a optimal location for the people who access it and this Engine manage multiple Datacenters, some close by and some far away in terms of latency. <br> <br> What is the maximum latency advised between the Engine and the hosts for a healthy operation or that doesn't matter much as long the Engine can always reach the hosts ?<br> <br> Currently the maximum latency I have between Engine and Hosts is 110ms and sometimes when there is a non-optimal route latency goes up to 170ms. Should I be concerned about this ?<br> <br> Thanks<br> Fernando<br> <br> </font> </body> </html> --------------D0FF4C4FF8B95B82C3141A34--

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How do you oVirt? Here the answers!
by Sandro Bonazzola 17 Apr '17

17 Apr '17

Hi, a few weeks ago I opened a survey asking oVirt users about how they use oVirt. Here are the analytics of the survey: https://docs.google.com/forms/d/1s3k4pq_U4vHTuUUKr6dOosGj_EGFxqEisansHlqnyy… Most notable facts: - 197 responses, two times the responses we got with the 3.6 survey! - CentOS confims as the most used distribution for running oVirt engine (89.8%) and Hypervisors (74.3% which become 94.2% including oVirt Node which is a CentOS spin) - Fedora is the second distribution (4.6%) mostly used only for runnig oVirt engine - oVirt Node jumped from 7.1% on 3.6 survey to 19.9% in 4.1! - Surprisingly we have someone running both engine and hypervisor on Ubuntu based system, within VMs. I'd like to hear more about this use case. - Within other OS we had Red Hat Enterprise Linux 6 and 7 and Scientific Linux (I guess 7, wasn't specified) - Within the storage, there isn't a "winner" between NFS, Gluster and iSCSI. Within Other Storage, Fiber Channel is the most used. We had also: Ceph, DAS, EMC ScaleIO, GPFS - Hosted Engine is the most used deployment choice with 58.4% (was 50.0% in 3.6) - 65.8% of Hosted Engine users use it in Hyperconverged setup. Thank you for your feedback and appreciation, we'll look into suggestions you sent in the survey. -- SANDRO BONAZZOLA ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D Red Hat EMEA <https://www.redhat.com/> <https://red.ht/sig> TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>

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JUST CANT UNDERSTAND WHY OVIRT DOESNT HAVE A WEB-GUI FOR EDITING , REMOVING UNWANTED STORAGE DOMAINS
by martin chamambo 17 Apr '17

17 Apr '17

JUST CANT UNDERSTAND WHY OVIRT DOESNT HAVE A WEB-GUI FOR EDITING ,REMOVING UNWANTED STORAGE DOMAINS I configured openfiler as my iscsi storage and while i am able to connect to it ....i wanted to change the IP address of the connecting IP to one of the logical networks which i disignated as a STORAGE role. This is a nightmare changing this and i have to set hosts in maintenence mode and delete the datacenter , is there any other way ?

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Memory ballooning not working on RHEV 4.1?
by Joseph Chapman 16 Apr '17

16 Apr '17

Hello all, I have a RHEV 4.1 host running Windows 10 VMs. I have installed the balloon driver on the VMs (RHEV guest tools), and enabled memory ballooning on the cluster using RHEV-M. On the VMs, I have set the system memory to Memory Size: 4GB, Maximum Memory: 16GB. While I can manually hot plug memory, I am not seeing additional memory being automatically allocated to the VMs during a SQL workload. The documentation for RHEV 4.1 is not clear on whether or not this automatic ballooning is functional (earlier documentation suggests that it is functional only by use of an API). I am new to RHEV and would appreciate some help troubleshooting this. Please let me know if there's any additional information I should provide. I messaged this mailing list on suggestion from someone in the IRC. I hope this is in-bounds. Thanks for your time! -- Joseph Chapman http://fjchapman.tumblr.com +1 828 777 0751

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virsh list
by Konstantin Raskoshnyi 15 Apr '17

15 Apr '17

Hi guys I'm trying to run virsh list (or any other virsh commands) virsh list Please enter your authentication name: admin Please enter your password: error: failed to connect to the hypervisor error: authentication failed: authentication failed But I have no clue about login:password ovirt uses. I tried admin password, also tried to create new account with saslpasswd2 Which didn't work to. Any solutions?

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Networking setup
by Alexis HAUSER 14 Apr '17

14 Apr '17

------=_Part_6006787_1898687053.1491982178695 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi, I have an Ovirt installation with 3 nodes (5 soon), containing 6 network cards (8 soon), a multipath iSCSI array and I would like to know how you would advice me to choose which link to bond or not. I thought about : 1+2 : ovirtmgmt (bond) 3+4 : iSCSI (multipath) 5 : VM and Display 6 : Migration What do you think about this configuration ? Is it a bad idea to set VM and display on the same network interface ? Do ovirtmgmt need high bandwidth ? In terms of bandwidth, is it a bad idea to have one single NIC for Migration ? Thanks in advance for your suggestions ------=_Part_6006787_1898687053.1491982178695 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><body><div style=3D"font-family: times new roman, new york, times, se= rif; font-size: 12pt; color: #000000"><div>Hi,<br></div><div><br></div><div= ><br></div><div>I have an Ovirt installation with 3 nodes (5 soon), contain= ing 6 network cards (8 soon), a multipath iSCSI array and I would like to k= now how you would advice me to choose which link to bond or not.<br></div><= div><br></div><div>I thought about : <br></div><div><br></div><div>1+2 : ov= irtmgmt (bond)<br></div><div>3+4 : iSCSI (multipath)<br></div><div>5 : VM a= nd Display<br></div><div>6 : Migration<br></div><div><br></div><div>What do= you think about this configuration ? <br></div><div>Is it a bad idea to se= t VM and display on the same network interface ?<br></div><div>Do ovirtmgmt= need high bandwidth ?<br></div><div>In terms of bandwidth, is it a bad ide= a to have one single NIC for Migration ?<br></div><div><br></div><div><br><= /div><div>Thanks in advance for your suggestions<br></div></div></body></ht= ml> ------=_Part_6006787_1898687053.1491982178695--

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After adding ISCSI storage on ovirt 4.0 (both engine and node) , storage doesnt come up
by martin chamambo 14 Apr '17

14 Apr '17

For some reason when i add iscsi storage on my ovirtNode it works like a charm , but when i reboot the ovirtengine and node , the storage doesnt come up and on the storage tab , i have noticed that the USE HOST dropdown is empty NB:iscsi and iscsid are running on the node and the LUN is active

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cleanup old recovery backup
by eric stam 14 Apr '17

14 Apr '17

Good morning, Just a question. When I do an upgrade of a hosted-engine by the "hosted-engine --upgarde-appliance" command the procedure will automatically make a backup for recovery. Is there a way to remove an old backup, without finding out yourself which files user used and which not (and hooping you will not remove a wrong one). -- Gr. Eric Stam *Mob*.: 06-50278119

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