Re: [ovirt-users] oVirt - High Availability

From: "Indunil Jayasooriya" <indunil75(a)gmail.com&gt; To: "Eli Mesika" <emesika(a)redhat.com&gt; Cc: users(a)ovirt.org Sent: Tuesday, October 13, 2015 6:25:59 PM Subject: Re: [ovirt-users] oVirt - High Availability Hi, Thank you very much for your reply. I would like to know in which cases HA will happen? 1. network failure? ( i.e , if we accidentally remove the network cable or if network card stopped working due to some reasons. ) 2. Server is suddenly shut-down due to power failure (i.e - NOT a proper shut-down ) or due to server Hardware failure such as motherboard or processor. 3. accidental reboot ?

WILL HA will happen when above mentioned things happen? YES or NO? Hope to hear from you? On Tue, Oct 13, 2015 at 7:33 PM, Eli Mesika <emesika(a)redhat.com&gt; wrote: > > > ----- Original Message ----- > > From: "Indunil Jayasooriya" <indunil75(a)gmail.com&gt; > > To: users(a)ovirt.org > > Sent: Tuesday, October 13, 2015 6:13:22 AM > > Subject: [ovirt-users] oVirt - High Availability > > > > Hi users, > > > > > > I have setup OVIRT 3.5 with 2 REDHAT 7.1 hosts. Everything is ok other > than > > HA ( High Availability). To test HA, Documentation says, Power > Management is > > needed. > > > > Could you pls let me know if this Power Management is a separate Device > or > > does it come with a BRANDED Server such as HP, IBM or Dell? > > PM can be implemented by a separate card or come as part of a BRANDED > Server such as HP, IBM or Dell. > > > > > I have seen a ILO port in HP servers. Can I use it for HA ( High > > Availability) in ovirt? > > Yes you can, ILO is one of the PM devices supported by oVirt > > > > > If power management is present in Branded Servers , Could you pls let me > know > > some Branded RHEL 7.1/CentOS 7.1 supported servers? > > > > Then, I can use it for Production use. > > > > > > This is an YOU TUBE video for HA. > > > > https://www.youtube.com/watch?v=uHCnXGUMaS0 > > > > Is this a correct video for HA? > > Please see also https://www.youtube.com/watch?v=IuRPGU7nF1E > > > > > > > I did some research. > > > > a few URLs. > > > > > > http://lists.ovirt.org/pipermail/users/2013-January/011519.html > > > > http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience > > > > > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtuali... > > > > > > what is Soft-Fencing Hosts ? ovirt doc gives below . ( > > http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience ) > > > > Soft-Fencing Hosts > > > > > > Sometimes a host becomes non-responsive due to an unexpected problem, and > > though VDSM is unable to respond to requests, the virtual machines that > > depend upon VDSM remain alive and accessible. In these situations, > > restarting VDSM returns VDSM to a responsive state and resolves this > issue. > > > > oVirt 3.3 introduces "soft-fencing over SSH". Prior to oVirt 3.3, > > non-responsive hosts were fenced only by external fencing devices. In > oVirt > > 3.3, the fencing process has been expanded to include "SSH Soft > Fencing", a > > process whereby oVirt attempts to restart VDSM via SSH on non-responsive > > hosts. If oVirt fails to restart VDSM via SSH, the responsibility for > > fencing falls to the external fencing agent if an external fencing agent > has > > been configured. > > > > > > BUT, It does NOT say how to set it up? > > > > > > is there any step by step doc for it? > > There is no need to set it up, soft-fencing is simply VDSM service restart > on the server side and is done always whether you configured PM on the host > or not as a first step when you host is not-responding > > > > > > > > > > > > > > HOPE TO hear from you? > > > > > > > > > > > > > > > > > > > > -- > > cat /etc/motd > > > > Thank you > > Indunil Jayasooriya > > http://www.theravadanet.net/ > > http://www.siyabas.lk/sinhala_how_to_install.html - Download Sinhala > Fonts > > > > > > _______________________________________________ > > Users mailing list > > Users(a)ovirt.org > > http://lists.ovirt.org/mailman/listinfo/users > > > -- cat /etc/motd Thank you Indunil Jayasooriya http://www.theravadanet.net/ http://www.siyabas.lk/sinhala_how_to_install.html - Download Sinhala Fonts