<div dir="ltr"><div><div><div><div><div><div><div>Hi, <br><br></div>Thank you very much for your reply. <br><br></div>I would like to know in which cases HA will happen?<br><br></div>1. network failure? ( i.e , if we accidentally remove the network cable or if network card stopped working due to some reasons. )<br><br></div>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. <br><br></div>3. accidental reboot ?<br><br><br></div>WILL HA will happen when above mentioned things happen?<br><br><br></div><div>YES or NO? <br><br></div><div>Hope to hear from you? <br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Oct 13, 2015 at 7:33 PM, Eli Mesika <span dir="ltr"><<a href="mailto:emesika@redhat.com" target="_blank">emesika@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><br>
<br>
----- Original Message -----<br>
> From: "Indunil Jayasooriya" <<a href="mailto:indunil75@gmail.com">indunil75@gmail.com</a>><br>
> To: <a href="mailto:users@ovirt.org">users@ovirt.org</a><br>
> Sent: Tuesday, October 13, 2015 6:13:22 AM<br>
> Subject: [ovirt-users] oVirt - High Availability<br>
><br>
> Hi users,<br>
><br>
><br>
> I have setup OVIRT 3.5 with 2 REDHAT 7.1 hosts. Everything is ok other than<br>
> HA ( High Availability). To test HA, Documentation says, Power Management is<br>
> needed.<br>
><br>
> Could you pls let me know if this Power Management is a separate Device or<br>
> does it come with a BRANDED Server such as HP, IBM or Dell?<br>
<br>
</span>PM can be implemented by a separate card or come as part of a BRANDED Server such as HP, IBM or Dell.<br>
<span class=""><br>
><br>
> I have seen a ILO port in HP servers. Can I use it for HA ( High<br>
> Availability) in ovirt?<br>
<br>
</span>Yes you can, ILO is one of the PM devices supported by oVirt<br>
<br>
><br>
> If power management is present in Branded Servers , Could you pls let me know<br>
<span class="">> some Branded RHEL 7.1/CentOS 7.1 supported servers?<br>
><br>
> Then, I can use it for Production use.<br>
><br>
><br>
> This is an YOU TUBE video for HA.<br>
><br>
> <a href="https://www.youtube.com/watch?v=uHCnXGUMaS0" rel="noreferrer" target="_blank">https://www.youtube.com/watch?v=uHCnXGUMaS0</a><br>
><br>
> Is this a correct video for HA?<br>
<br>
</span>Please see also <a href="https://www.youtube.com/watch?v=IuRPGU7nF1E" rel="noreferrer" target="_blank">https://www.youtube.com/watch?v=IuRPGU7nF1E</a><br>
<span class=""><br>
><br>
><br>
> I did some research.<br>
><br>
> a few URLs.<br>
><br>
><br>
> <a href="http://lists.ovirt.org/pipermail/users/2013-January/011519.html" rel="noreferrer" target="_blank">http://lists.ovirt.org/pipermail/users/2013-January/011519.html</a><br>
><br>
> <a href="http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience" rel="noreferrer" target="_blank">http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience</a><br>
><br>
> <a href="https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5/html/Administration_Guide/sect-Improving_Uptime_with_Virtual_Machine_High_Availability.html" rel="noreferrer" target="_blank">https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5/html/Administration_Guide/sect-Improving_Uptime_with_Virtual_Machine_High_Availability.html</a><br>
><br>
><br>
> what is Soft-Fencing Hosts ? ovirt doc gives below . (<br>
> <a href="http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience" rel="noreferrer" target="_blank">http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience</a> )<br>
><br>
> Soft-Fencing Hosts<br>
><br>
><br>
> Sometimes a host becomes non-responsive due to an unexpected problem, and<br>
> though VDSM is unable to respond to requests, the virtual machines that<br>
> depend upon VDSM remain alive and accessible. In these situations,<br>
> restarting VDSM returns VDSM to a responsive state and resolves this issue.<br>
><br>
> oVirt 3.3 introduces "soft-fencing over SSH". Prior to oVirt 3.3,<br>
> non-responsive hosts were fenced only by external fencing devices. In oVirt<br>
> 3.3, the fencing process has been expanded to include "SSH Soft Fencing", a<br>
> process whereby oVirt attempts to restart VDSM via SSH on non-responsive<br>
> hosts. If oVirt fails to restart VDSM via SSH, the responsibility for<br>
> fencing falls to the external fencing agent if an external fencing agent has<br>
> been configured.<br>
><br>
><br>
> BUT, It does NOT say how to set it up?<br>
><br>
><br>
> is there any step by step doc for it?<br>
<br>
</span>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<br>
<span class=""><br>
<br>
><br>
><br>
><br>
><br>
><br>
> HOPE TO hear from you?<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> --<br>
> cat /etc/motd<br>
><br>
> Thank you<br>
> Indunil Jayasooriya<br>
> <a href="http://www.theravadanet.net/" rel="noreferrer" target="_blank">http://www.theravadanet.net/</a><br>
> <a href="http://www.siyabas.lk/sinhala_how_to_install.html" rel="noreferrer" target="_blank">http://www.siyabas.lk/sinhala_how_to_install.html</a> - Download Sinhala Fonts<br>
><br>
><br>
</span>> _______________________________________________<br>
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><br>
</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr">cat /etc/motd<br><br>Thank you<br>Indunil Jayasooriya <br><a href="http://www.theravadanet.net/" target="_blank">http://www.theravadanet.net/</a><br><a href="http://www.siyabas.lk/sinhala_how_to_install.html" target="_blank">http://www.siyabas.lk/sinhala_how_to_install.html</a> - Download Sinhala Fonts<br><br></div></div>
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