[Users] High Availability

[Shu Ming]

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: thildred at redhat.com
> Internal: 8588287
> Mobile: +61 4 666 25242
> IRC: thildred
>
> ----- Original Message -----
>> From: "Dafna Ron" <dron at redhat.com>
>> To: suporte at logicworks.pt
>> Cc: Users at ovirt.org
>> 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, suporte at logicworks.pt 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" <r.koch at ovido.at>
>>> Para: suporte at logicworks.pt, Users at ovirt.org
>>> 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:suporte at logicworks.pt <suporte at logicworks.pt>
>>>> Sent: Sunday 17th March 2013 17:28
>>>> To: Users at ovirt.org
>>>> 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
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>
>> --
>> Dafna Ron
>> _______________________________________________
>> Users mailing list
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>> http://lists.ovirt.org/mailman/listinfo/users
>>
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-- 
---
舒明 Shu Ming
Open Virtualization Engineerning; CSTL, IBM Corp.
Tel: 86-10-82451626  Tieline: 9051626 E-mail: shuming at cn.ibm.com or shuming at linux.vnet.ibm.com
Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC

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