[ovirt-users] oVirt - High Availability

Fri Oct 16 08:28:38 UTC 2015

Hi,

Thank you very much for help.

I have one more question.

How to connect *ILO Power Management ports *between *2 hypersvisors? *

Let's assume,

192.168.1.1/24  is the ip address of hypersvisor1 node.
192.168.1.2/24 is the ip address given to ILO port of hypersvisor1 node.

192.168.1.3/24  is the ip address of hypersvisor2 node.
192.168.1.4/24 is the ip address given to ILO port of hypersvisor2 node.

then,  Can We connect ILO ports of these 2 hypersvisors *to the same switch*
where Ethernet ports of these 2 hypersvisors are connected?

or

can we connect ILO ports of these 2 hypersvisors with  a *CROSS cable*
while Ethernet ports of these 2 hypersvisors are connected
*to a switch? *

If you can answer, I will be able to complete this question?

Hope to hear from you.

On Wed, Oct 14, 2015 at 3:21 PM, Eli Mesika <emesika at redhat.com> wrote:

>
>
> ----- Original Message -----
> > From: "Indunil Jayasooriya" <indunil75 at gmail.com>
> > To: "Eli Mesika" <emesika at redhat.com>
> > Cc: users at 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 ?
>
> Basically yes for all 3
> in case of 1)
> There is a grace period that depends on the host load we give the host to
> get UP again and if that grace period passes then host is rebooted and HA
> VMs are atetmpted  to run on a different host
>
> >
> >
> > 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
> >
>

-- 
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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