Re: [OpenNode-users] OpenNode with DRBD

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

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
>>> 
>>> ------------------------------------------------------------------------------
>>> 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
>>> 
>> 
>> 
>> ------------------------------------------------------------------------------
>> 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
>> 
> 
> 
> 
> -- 
> 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:
> http://p.sf.net/sfu/dev2dev-palm
> _______________________________________________
> OpenNode-users mailing list
> Ope...@li...
> https://lists.sourceforge.net/lists/listinfo/opennode-users
>