Re: [Users] [node-devel] Help required to configure shared storage on RHEL+KVM

(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.