Re: [OpenNode-users] OpenNode with DRBD

[<ope...@li...>]

I was thinking drbd could be kind of a poor mans shared storage, that
happens to be highly available. Set drbd up with protocol C in a
primary / primary arraignment. Then use something like this:
http://www.linux-ha.org/doc/re-ra-VirtualDomain.html to migrate if
something were to happen?

My ultimate goal is to make a windows 2003 server as highly avaiable
as possible, using just 2 servers.




On Fri, Jul 30, 2010 at 10:21 AM,  <ope...@li...> wrote:
> That is all true - but stopping VM and then waiting for sync is not what I would call "live" migration.
> Better solution should be to have a separate shared storage somehow - would it be FC, simple NFS or GFS2 etc.
> If HA is needed for shared storage there are solutions for that - including for example doing DRDB HA (active-passive two box) setup for shared storage server.
> --
> ----------------------------------------------
> Andres Toomsalu, an...@ac...
>
>
>
>
>
> On 30.07.2010, at 18:49, ope...@li... wrote:
>
>> When using drbd with protocol C, i don't see why it shouldn't work.
>> You just have to make sure to stop the VM on node A, promote drbd to
>> primary on node B, and start the VMs there...
>>
>>> From drbd website, regarding protocol C. http://www.drbd.org/home/mirroring
>>
>> "Mirroring can be done tightly coupled (synchronous). That means that
>> the file system on the active node is notified that the writing of the
>> block was finished only when the block made it to both disks of the
>> cluster.
>>
>> Synchronous mirroring (called protocol C in DRBD speak) is the right
>> choice for HA clusters where you dare not lose a single transaction in
>> case of the complete crash of the active (primary in DRBD speak)
>> node."
>>
>> Julian.
>>
>> On Thu, Jul 29, 2010 at 22:57,  <ope...@li...> wrote:
>>> In order KVM live migration to work you will need some sort of shared storage - DRBD is more like a synced storage eg network RAID - I would expect that KVM live migration wont work correctly with it - as DRDB sync has a network delay and filesystem changes wont be instant on both sides.
>>>
>>> Is simple NFS sharing for shared VM storage not an option?
>>> http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization_Guide/sect-Virtualization-KVM_live_migration-Share_storage_example_NFS_for_a_simple_migration.html
>>> --
>>> ----------------------------------------------
>>> Andres Toomsalu, an...@ac...
>>>
>>>
>>>
>>>
>>>
>>> On 29.07.2010, at 23:21, ope...@li... wrote:
>>>
>>>> Does any one have any experience with running open node with DRBD? Any
>>>> tips or pointers? I am wanting to give it a go so I can have instant
>>>> migration but was wondering if anybody had done anything like that
>>>> before.
>>>>
>>>>
>>>> Thanks,
>>>> --
>>>>  _
>>>> /-\ ndrew Niemantsverdriet
>>>> Academic Computing
>>>> (406) 238-7360
>>>> Rocky Mountain College
>>>> 1511 Poly Dr.
>>>> Billings MT, 59102
>>>>
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>>>
>>>
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>>
>>
>>
>> --
>> http://www.julianmenendez.es
>>
>> ------------------------------------------------------------------------------
>> The Palm PDK Hot Apps Program offers developers who use the
>> Plug-In Development Kit to bring their C/C++ apps to Palm for a share
>> of $1 Million in cash or HP Products. Visit us here for more details:
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>> _______________________________________________
>> OpenNode-users mailing list
>> Ope...@li...
>> https://lists.sourceforge.net/lists/listinfo/opennode-users
>>
>
>
> ------------------------------------------------------------------------------
> The Palm PDK Hot Apps Program offers developers who use the
> Plug-In Development Kit to bring their C/C++ apps to Palm for a share
> of $1 Million in cash or HP Products. Visit us here for more details:
> http://p.sf.net/sfu/dev2dev-palm
> _______________________________________________
> OpenNode-users mailing list
> Ope...@li...
> https://lists.sourceforge.net/lists/listinfo/opennode-users
>



-- 
 _
/-\ ndrew Niemantsverdriet
Academic Computing
(406) 238-7360
Rocky Mountain College
1511 Poly Dr.
Billings MT, 59102