- Users - oVirt List Archives

Importing existing KVM hosts to Ovirt
by Konstantin Raskoshnyi 18 Apr '17

18 Apr '17

Hi guys, I just installed oVirt 4.1 - works great! But the questing is, we have around 50 existing kvm hosts, is it really possible during adding them to oVirt add all VMs from them to oVirt? Second options I see - import disks to oVirts and re-create machines Thanks for the help.

3 6

storage redundancy in Ovirt
by Konstantin Raskoshnyi 18 Apr '17

18 Apr '17

Hi guys, I have one nfs storage, it's connected through host1. host2 also has access to it, I can easily migrate vms between them. The question is - if host1 is down - all infrastructure is down, since all traffic goes through host1, is there any way in oVirt to use redundant storage? Only glusterfs? Thanks

9 36

Empty ovirt engine web pages
by shubham dubey 18 Apr '17

18 Apr '17

Hello, I have installed ovirt engine from source and installed all other required packages also, including ovirt-js-dependencies.But when I am login to the admin account I am getting blank page everytime. Some other pages are also coming empty sometime. I have pasted the logs for $HOME/ovirt-engine/share/ovirt-engine/services/ovirt-engine/ovirt-engine.py start[1].The possible error log is 2017-04-13 09:07:09,902+05 ERROR [org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataServlet.CacheUpdate.Utilization] (EE-ManagedThreadFactory-default-Thread-1) [] Could not update the Utilization Cache: Error while running SQL query: org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataException: Error while running SQL query at org.ovirt.engine.ui.frontend.server.dashboard.dao.BaseDao.runQuery(BaseDao.java:60) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.dao.HostDwhDao.getTotalCpuMemCount(HostDwhDao.java:78) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.HourlySummaryHelper.getTotalCpuMemCount(HourlySummaryHelper.java:43) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.HourlySummaryHelper.getCpuMemSummary(HourlySummaryHelper.java:21) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataServlet.lookupGlobalUtilization(DashboardDataServlet.java:294) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataServlet.getDashboard(DashboardDataServlet.java:268) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataServlet.populateUtilizationCache(DashboardDataServlet.java:231) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataServlet.access$000(DashboardDataServlet.java:26) [frontend.jar:] at org.ovirt.engine.ui.frontend.server.dashboard.DashboardDataServlet$1.run(DashboardDataServlet.java:106) [frontend.jar:] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_121] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [rt.jar:1.8.0_121] at org.glassfish.enterprise.concurrent.internal.ManagedScheduledThreadPoolExecutor$ManagedScheduledFutureTask.access$201(ManagedScheduledThreadPoolExecutor.java:383) [javax.enterprise.concurrent-1.0.jar:] at org.glassfish.enterprise.concurrent.internal.ManagedScheduledThreadPoolExecutor$ManagedScheduledFutureTask.run(ManagedScheduledThreadPoolExecutor.java:534) [javax.enterprise.concurrent-1.0.jar:] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_121] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_121] at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_121] at org.glassfish.enterprise.concurrent.ManagedThreadFactoryImpl$ManagedThread.run(ManagedThreadFactoryImpl.java:250) [javax.enterprise.concurrent-1.0.jar:] Caused by: java.sql.SQLException: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/DWHDataSource at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:146) at org.jboss.as.connector.subsystems.datasources.WildFlyDataSource.getConnection(WildFlyDataSource.java:66) at org.ovirt.engine.ui.frontend.server.dashboard.dao.BaseDao.runQuery(BaseDao.java:53) [frontend.jar:] ... 16 more Caused by: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/DWHDataSource at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:656) at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:429) at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:747) at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:138) ... 18 more Caused by: javax.resource.ResourceException: IJ031084: Unable to create connection at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:345) at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:352) at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:287) at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.createConnectionEventListener(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:1320) at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.getConnection(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:496) at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getSimpleConnection(AbstractPool.java:617) at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:589) at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:590) ... 21 more [1]https://pastebin.com/UZ5VFH7H Thanks, Shubham

4 5

options for fence_ipmilan?
by Matthias Leopold 18 Apr '17

18 Apr '17

hi, i'm trying to make fencing (via ipmilan) work with a ipmi user with only "OPERATOR" privileges. This works with CLI (-L OPERATOR). when trying to configure this via GUI i fail. interface tells me Test failed: [WARNING:root:Parse error: Ignoring unknown option 'L=OPERATOR', , ERROR:root:Failed: Unable to obtain correct plug status or plug is not available, , , Failed: Unable to obtain correct plug status or plug is not available, , ] i tried "-L OPERATOR" and "L=OPERATOR", with and without quotes, no avail... can somebody help me? ovirt 4.1.1 -- Matthias Leopold IT Systems & Communications Medizinische Universität Wien Spitalgasse 23 / BT 88 /Ebene 00 A-1090 Wien Tel: +43 1 40160-21241 Fax: +43 1 40160-921200

3 3

Storage latency message
by Chris Adams 18 Apr '17

18 Apr '17

I've been getting an occasional message like: Storage domain hosted_storage experienced a high latency of 5.26121 seconds from host node3. I'm not sure what is causing them though. I look at my storage (EqualLogic iSCSI SAN) and storage network switches and don't see any issues. When the above message was logged, node3 was not hosting the engine (doesn't even have engine HA installed), nor was it the SPM, so why would it have even been accessing the hosted_storage domain? This is with oVirt 4.1. -- Chris Adams <cma(a)cmadams.net>

3 4

vm "maximum memory" setting questions
by Nelson Lameiras 18 Apr '17

18 Apr '17

------=_Part_17107869_398743795.1492508811941 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hello,=20 A new vm setting "maximum memory" has appeared in oVirt >4 which by default= has the value "current memory"*4=20 - Why is "maximum memory" setting necessary to set?=20 - Why isn't this value set to "infinity" by default ?=20 It seems to me kind of uselessly counter productif to have to decide a maxi= mum memory amount beforehand. if we do this, will we have to set maximum CP= U cores also in the future (being devil's advocate here ;) )=20 I did searched oVirt documentation, but very little information is availabl= e.=20 Maybe this is an libvirt question, but I'm hopping a oVirt guru could quick= ly enlighten me.=20 cordialement, regards,=20 =09Nelson LAMEIRAS=20 Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux / Systems and Networks enginee= r=20 Tel: +33 5 32 09 09 70=20 nelson.lameiras(a)lyra-network.com=20 www.lyra-network.com | www.payzen.eu=20 =09 =09 =09 Lyra Network, 109 rue de l'innovation, 31670 Lab=C3=A8ge, FRANCE=20 ------=_Part_17107869_398743795.1492508811941 Content-Type: multipart/related; boundary="----=_Part_17107870_1472858614.1492508811941" ------=_Part_17107870_1472858614.1492508811941 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><body><div style=3D"font-family: arial, helvetica, sans-serif; font-s= ize: 12pt; color: #000000"><div>Hello,<br></div><div><br data-mce-bogus=3D"= 1"></div><div>A new vm setting "maximum memory" has appeared in oVirt >4= which by default has the value "current memory"*4<br data-mce-bogus=3D"1">= </div><div><br data-mce-bogus=3D"1"></div><div>- Why is "maximum memory" se= tting necessary to set? </div><div>- Why isn't this value set to "infinity"= by default ?</div><div><br data-mce-bogus=3D"1"></div><div>It seems to me = kind of uselessly counter productif to have to decide a maximum memory amou= nt beforehand. if we do this, will we have to set maximum CPU cores also in= the future (being devil's advocate here ;) )<br data-mce-bogus=3D"1"></div= ><div><br data-mce-bogus=3D"1"></div><div><div>I did searched oVirt documen= tation, but very little information is available.</div><div>Maybe this is a= n libvirt question, but I'm hopping a oVirt guru could quickly enlighten me= .<br></div></div><div><br data-mce-bogus=3D"1"></div><div data-marker=3D"__= SIG_PRE__"><div>cordialement, regards,</div><div><br data-mce-bogus=3D"1"><= /div><table style=3D"margin: 0px; table-layout: fixed; border: none; width:= 345pt; padding: 0px;" data-mce-style=3D"margin: 0px; table-layout: fixed; = border: none; width: 345pt; padding: 0px;" width=3D"460" cellspacing=3D"0" = cellpadding=3D"0" border=3D"0"><tbody><tr><td style=3D"margin: 0; font-size= : 11px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 16px; w= idth: 86.25pt; text-align: left;" data-mce-style=3D"margin: 0; font-size: 1= 1px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 16px; widt= h: 86.25pt; text-align: left;" width=3D"115" valign=3D"top"><a href=3D"http= s://www.lyra-network.com/" style=3D"border: none; text-decoration: none; wi= dth: 100%; display: block; clear: both;" data-mce-href=3D"https://www.lyra-= network.com/" data-mce-style=3D"border: none; text-decoration: none; width:= 100%; display: block; clear: both;"><img src=3D"cid:b5204ab380be6ea6d0270a= e7bfb4f103942609aa@zimbra" alt=3D"" data-mce-src=3D"/home/admin@lyra-networ= k.com/corporate-documents/element-signature_logo_lyra_115x94.jpg" doc=3D"co= rporate-documents/element-signature_logo_lyra_115x94.jpg" width=3D"115" hei= ght=3D"94" border=3D"0"></a><br data-mce-bogus=3D"1"></td><td style=3D"marg= in: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; line= -height: 16px; width: 258.75pt;" data-mce-style=3D"margin: 0; font-size: 11= px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 16px; width= : 258.75pt;" width=3D"345" valign=3D"top"><table style=3D"margin: 0; width:= 258.75pt; table-layout: fixed; border: none;" data-mce-style=3D"margin: 0;= width: 258.75pt; table-layout: fixed; border: none;" width=3D"345" cellspa= cing=3D"0" cellpadding=3D"0" border=3D"0"><tbody><tr><td style=3D"font-size= : 16px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 18px; f= ont-weight: bold;" data-mce-style=3D"font-size: 16px; font-family: Arial,sa= ns-serif; color: #2b3c7a; line-height: 18px; font-weight: bold;">Nelson LAM= EIRAS</td></tr><tr><td style=3D"font-family: Arial,sans-serif; color: #2b3c= 7a; font-size: 11px; line-height: 16px;" data-mce-style=3D"font-family: Ari= al,sans-serif; color: #2b3c7a; font-size: 11px; line-height: 16px;">Ing=C3= =A9nieur Syst=C3=A8mes et R=C3=A9seaux<span style=3D"font-family: Arial,san= s-serif; color: #337ab7; font-size: 11px;" data-mce-style=3D"font-family: A= rial,sans-serif; color: #337ab7; font-size: 11px;"> / Systems and Networks = engineer</span></td></tr><tr><td style=3D"line-height: 16px; font-family: '= Arial',sans-serif; color: #2b3c7a; font-size: 11px;" data-mce-style=3D"line= -height: 16px; font-family: 'Arial',sans-serif; color: #2b3c7a; font-size: = 11px;"><span style=3D"font-family: Arial,sans-serif; color: #2b3c7a; font-s= ize: 11px;" data-mce-style=3D"font-family: Arial,sans-serif; color: #2b3c7a= ; font-size: 11px;">Tel: +33 5 32 09 09 70</span></td></tr><tr><td style=3D= "line-height: 16px; font-family: 'Arial',sans-serif; color: #2b3c7a; font-s= ize: 11px;" data-mce-style=3D"line-height: 16px; font-family: 'Arial',sans-= serif; color: #2b3c7a; font-size: 11px;"><a href=3D"mailto:nelson.lameiras@= lyra-network.com" style=3D"font-size: 11px; font-family: Arial,sans-serif; = line-height: 16px; text-decoration: none;" data-mce-href=3D"mailto:nelson.l= ameiras(a)lyra-network.com" data-mce-style=3D"font-size: 11px; font-family: A= rial,sans-serif; line-height: 16px; text-decoration: none;">nelson.lameiras= @lyra-network.com</a><br data-mce-bogus=3D"1"></td></tr><tr><td style=3D"li= ne-height: 16px; font-family: 'Arial',sans-serif; color: #2b3c7a; font-size= : 11px;" data-mce-style=3D"line-height: 16px; font-family: 'Arial',sans-ser= if; color: #2b3c7a; font-size: 11px;"><a href=3D"https://www.lyra-network.c= om/" style=3D"font-size: 11px; font-family: Arial,sans-serif; line-height: = 16px; border: none; text-decoration: none;" data-mce-href=3D"https://www.ly= ra-network.com/" data-mce-style=3D"font-size: 11px; font-family: Arial,sans= -serif; line-height: 16px; border: none; text-decoration: none;">www.lyra-n= etwork.com</a> <a href=3D"https://payzen.eu" style=3D"font-size: 11px; font= -family: Arial,sans-serif; line-height: 16px; border: none; text-decoration= : none;" data-mce-href=3D"https://payzen.eu" data-mce-style=3D"font-size: 1= 1px; font-family: Arial,sans-serif; line-height: 16px; border: none; text-d= ecoration: none;"> | www.payzen.eu</a><br data-mce-bogus=3D"1"></td></tr></= tbody></table></td></tr></tbody></table><table style=3D"margin: 0; table-la= yout: fixed; border: none; width: 345pt;" data-mce-style=3D"margin: 0; tabl= e-layout: fixed; border: none; width: 345pt;" width=3D"460" cellspacing=3D"= 0" cellpadding=3D"0"><tbody><tr><td style=3D"margin: 0; font-size: 11px; fo= nt-family: Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 24pt= ; text-align: left;" data-mce-style=3D"margin: 0; font-size: 11px; font-fam= ily: Arial,sans-serif; color: #2b3c7a; line-height: 16px; width: 24pt; text= -align: left;" width=3D"32" valign=3D"top"><a href=3D"https://www.youtube.c= om/channel/UCrVl1CO_Jlu3KbiRH-tQ_vA" style=3D"border: none; text-decoration= : none; margin: 0; float: left; display: inline-block; width: 32px;" data-m= ce-href=3D"https://www.youtube.com/channel/UCrVl1CO_Jlu3KbiRH-tQ_vA" data-m= ce-style=3D"border: none; text-decoration: none; margin: 0; float: left; di= splay: inline-block; width: 32px;"><img src=3D"cid:a159bfc80bd55e52e4beb67a= fe1bb5d728b24bbd@zimbra" alt=3D"" data-mce-src=3D"/home/admin(a)lyra-network.= com/corporate-documents/element-signature_logo_YouTube_32x28.jpg" doc=3D"co= rporate-documents/element-signature_logo_YouTube_32x28.jpg" width=3D"32" he= ight=3D"28" border=3D"0"></a><br data-mce-bogus=3D"1"></td><td style=3D"mar= gin: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; lin= e-height: 16px; width: 30.75pt; text-align: left;" data-mce-style=3D"margin= : 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; line-h= eight: 16px; width: 30.75pt; text-align: left;" width=3D"41" valign=3D"top"= ><a href=3D"https://www.linkedin.com/company/lyra-network_2" style=3D"borde= r: none; text-decoration: none; margin: 0; float: left; display: inline-blo= ck; width: 41px;" data-mce-href=3D"https://www.linkedin.com/company/lyra-ne= twork_2" data-mce-style=3D"border: none; text-decoration: none; margin: 0; = float: left; display: inline-block; width: 41px;"><img src=3D"cid:a0b588bfd= 31a0ba86f40d6b6d9268691fea5c0eb@zimbra" data-mce-src=3D"/home/admin@lyra-ne= twork.com/corporate-documents/element-signature_logo_LinkedIn_41x28.jpg" do= c=3D"corporate-documents/element-signature_logo_LinkedIn_41x28.jpg" width= =3D"41" height=3D"28" border=3D"0"></a><br data-mce-bogus=3D"1"></td><td st= yle=3D"margin: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2= b3c7a; line-height: 16px; width: 31.5pt; text-align: left;" data-mce-style= =3D"margin: 0; font-size: 11px; font-family: Arial,sans-serif; color: #2b3c= 7a; line-height: 16px; width: 31.5pt; text-align: left;" width=3D"42" valig= n=3D"top"><a href=3D"https://twitter.com/LyraNetwork" style=3D"border: none= ; text-decoration: none; margin: 0; float: left; display: inline-block; wid= th: 42px;" data-mce-href=3D"https://twitter.com/LyraNetwork" data-mce-style= =3D"border: none; text-decoration: none; margin: 0; float: left; display: i= nline-block; width: 42px;"><img src=3D"cid:149d6072bc67d356ea2144765e44ef94= 08b8e52b@zimbra" alt=3D"" data-mce-src=3D"/home/admin(a)lyra-network.com/corp= orate-documents/element-signature_logo_Twitter_42x28.jpg" doc=3D"corporate-= documents/element-signature_logo_Twitter_42x28.jpg" width=3D"42" height=3D"= 28" border=3D"0"></a><br data-mce-bogus=3D"1"></td><td style=3D"margin: 0; = font-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; line-height= : 16px; width: 258.75pt; text-align: left;" data-mce-style=3D"margin: 0; fo= nt-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: = 16px; width: 258.75pt; text-align: left;" width=3D"345" valign=3D"top"><a h= ref=3D"https://payzen.eu" style=3D"border: none; text-decoration: none; mar= gin: 0; float: left; display: inline-block; width: 61px;" data-mce-href=3D"= https://payzen.eu" data-mce-style=3D"border: none; text-decoration: none; m= argin: 0; float: left; display: inline-block; width: 61px;"><img src=3D"cid= 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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--

3 2

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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