[ovirt-users] oVirt - High Availability

[Indunil Jayasooriya]

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 at redhat.com> wrote:

>
>
> ----- 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
>
>
> >
> >
> >
> >
> >
> > 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 at 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
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