(moving to users@, node-devel is definitely a wrong list but I'm not sure about a correct one) hi Amol, Sanglikar, Amol (Serviceguard) píše v Pá 24. 08. 2012 v 10:20 +0000:

Hi Ovirt dev-Community,

We have a host running RHEL 6.2 + KVM , and created 2 Virtual machines on the host which are running RHEL6.2.

We are trying to configure shared storage for 2 VMs. This shared storage on VMs should understand the SCSI requests.

IIRC, if you need to pass through SCSI requests from the VM to the underlying block device, you need virtio-scsi qemu device that is included in RHEL as a tech-preview since 6.3 - again IIRC.

The reason for this requirement is that we would be using SCSI-3 PR (persistent reservation ) utils, which is sg3_utils to register / reserve on the storage/disks.

We believe that exposing the raw LUNs from host to VMs as shared storage (which is same as RDM - Raw Device Mapping in VMware ESX environment ) would meet our above stated requirement.

So can you please help us understand the following

1/ How to expose the Raw LUNs , from host ( RHEL 6.2 + KVM ) to Virtual machines which are running RHEK 6.2.

You should create a shared disk but you can't get it really raw in terms of scsi commands unless you switch to virtio-scsi. It is raw in a sense of not using intermediate layers like qcow2 on top of the LUN. David

2/ Also , if there is any alternate way to achieve the above requirement in RHEL + KVM environment, apart from the mechanism we stated , please let us know.

Thanks & Regards,

-Amol

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