[ovirt-users] oVirt - High Availability

[Eli Mesika]

----- Original Message -----
> From: "Indunil Jayasooriya" <indunil75 at gmail.com>
> To: users at 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_Virtualization/3.5/html/Administration_Guide/sect-Improving_Uptime_with_Virtual_Machine_High_Availability.html
> 
> 
> 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 


> 
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> 
> HOPE TO hear from you?
> 
> 
> 
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> 
> --
> cat /etc/motd
> 
> Thank you
> Indunil Jayasooriya
> http://www.theravadanet.net/
> http://www.siyabas.lk/sinhala_how_to_install.html - Download Sinhala Fonts
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> 
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