libvirt users - Aug 2013 - Re: Oracle RAC in libvirt+KVM environment

On Sat, Aug 10, 2013 at 11:14:39AM +0800, Timon Wang
wrote:
> I have tryied change the disk bus to SCSI, add a SCSI controller whose
> model is virtio-scsi, still can't setup the RAC instance.
> 
> I tried to use windows 2008 Failover Cluster feature to setup a a
> Failover Cluster instead, and I can't find any cluster disk to share
> between two nodes. So when Failover Cluster is setup, I can't add any
> Cluster disk to the Failover Cluster.
> 
> Have I missed some thing?
I'm not sure what SCSI-level requirements RAC or Failover Cluster have.

If anyone knows which features are needed it would be possible to
confirm whether they are supported under KVM.

I expect this can only work if you are passing through a shared LUN.
Can you describe your configuration?

Stefan

Yes, SCSI bus likes pass through a shared LUN to the vm, and I am
using a shared LUN for 'share' purpose.

I found a post that vmware use lsilogic bus for the shared disk, but
my qemu/kvm version can't support lsilogic bus.

I'm tring to update qemu/kvm version for lsilogic bus support.


On 8/12/13, Stefan Hajnoczi <stefanha@gmail.com>
wrote:
> On Sat, Aug 10, 2013 at 11:14:39AM +0800, Timon Wang wrote:
>> I have tryied change the disk bus to SCSI, add a SCSI controller whose
>> model is virtio-scsi, still can't setup the RAC instance.
>>
>> I tried to use windows 2008 Failover Cluster feature to setup a a
>> Failover Cluster instead, and I can't find any cluster disk to
share
>> between two nodes. So when Failover Cluster is setup, I can't add
any
>> Cluster disk to the Failover Cluster.
>>
>> Have I missed some thing?
>
> I'm not sure what SCSI-level requirements RAC or Failover Cluster have.
>
> If anyone knows which features are needed it would be possible to
> confirm whether they are supported under KVM.
>
> I expect this can only work if you are passing through a shared LUN.
> Can you describe your configuration?
>
> Stefan
>

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On Mon, Aug 12, 2013 at 06:17:51PM +0800, Timon Wang
wrote:
> Yes, SCSI bus likes pass through a shared LUN to the vm, and I am
> using a shared LUN for 'share' purpose.
> 
> I found a post that vmware use lsilogic bus for the shared disk, but
> my qemu/kvm version can't support lsilogic bus.
> 
> I'm tring to update qemu/kvm version for lsilogic bus support.
Use virtio-scsi.  The emulated LSI SCSI controller has known bugs and is
not actively developed - don't be surprised if you hit issues with it.

The question is still what commands RAC or Failover Clustering use.  If
you find that the software refuses to run, it could be because
additional work is required to make it work on KVM.

Stefan