Tim,
Thanks for your information. I am not sure why we need power management
to be configured for the hosts running HA virtual machines. If one host
is down because of network interrupt or power failure, the engine should
know how many HA VMs are down and find out the VM images on the storage
domain to start the VM instances on another host in the cluster. Why do
we need power manager to be configured? We only need a method to check
the VM or host status and a method to restart the VM instances with
existing VM images on another host. Is it required to force powering
down the failing host forever to make sure the failing host will not
come back to live again?
*
Power management must be configured for the hosts running the highly
available virtual machines.
*
The host running the highly available virtual machine must be part
of a cluster which has other available hosts.
*
The destination host must be running.
*
The source and destination host must have access to the data domain
on which the virtual machine resides.
*
The source and destination host must have access to the same virtual
networks and VLANs.
*
There must be enough CPUs on the destination host that are not in
use to support the virtual machine's requirements.
*
There must be enough RAM on the destination host that is not in use
to support the virtual machine's requirements.
Tim Hildred:
You might also find this helpful:
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Virtualization/3.1/html/Administration_Guide/High_availability_considerations.html
The topics before and after it explain a bit more about high availability.
Tim Hildred, RHCE
Content Author II - Engineering Content Services, Red Hat, Inc.
Brisbane, Australia
Email: [email protected]
Internal: 8588287
Mobile: +61 4 666 25242
IRC: thildred
----- Original Message -----
From: "Dafna Ron" <[email protected]>
To: [email protected]
Cc: [email protected]
Sent: Monday, March 18, 2013 4:46:51 AM
Subject: Re: [Users] High Availability
I think that there is some confusion here so I will explain what are
the
configurations for fail-over.
power management will reboot your host if a connectivity issue is
detected so all your vm's will be killed.
resilience policy will allow you to choose vm migration policy during
a
host failure and its configured in the cluster level (clusters ->
select
cluster -> general sub tab -> edit policy)
High Availability is configured only for servers type vm's and what
it
does is re-run the vm in case the pid of the vm is killed (so most
commonly, if you have power management configured, and the host is
rebooted, the vm will start automatically on a different host).
so it really depends what you want. if you want vm migration than
look
into cluster policy, if you want a specific vm to always be up and
you
don't care about the other vm's than configure power management and a
HA
vm. it really depends on what you need.
On 03/17/2013 07:15 PM, [email protected] wrote:
Is it Mandatory to have power manamement enabled? if yes what
equipment do you recommend to use with it?
Regards
Jose
----- Mensagem original -----
De: "René Koch" <[email protected]>
Para: [email protected], [email protected]
Enviadas: Domingo, 17 Março, 2013 16:47:41
Assunto: RE: [Users] High Availability
Hi,
You have to configure power management to make high availability
working and mark the vms high availability checkbox...
Regards,
René
-----Original message-----
From:[email protected] <[email protected]>
Sent: Sunday 17th March 2013 17:28
To: [email protected]
Subject: [Users] High Availability
What should I need to configure to put HA working? I mean, when a
host broke all the VM automatically move to another host.
Do I need to have Power management enabled?
Thanks
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Dafna Ron
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舒明 Shu Ming
Open Virtualization Engineerning; CSTL, IBM Corp.
Tel: 86-10-82451626 Tieline: 9051626 E-mail: [email protected] or
[email protected]
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