Re: [OpenNode-users] OpenNode with DRBD

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

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,
>> --
>>  _
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>
> ------------------------------------------------------------------------------
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