how to share RDM disks between vms and achive vmotion at the same time.

I have created a cluster composed of two hosts. I created one vm on each host. I put the OS disk/first disk on a datastore for each.

Then, I tried to create a RDM (raw disk mapping) on the first node and save the RDM on a shared datastore. I added the same RDM disk on the second vm. All things like fine, I can power on both nodes without problem. When I tried to vmotion anyone of them, I got the following error:


"Virtual machine is configured to use a device that prevents the operation: Device 'SCSI controller 1' is a SCSI controller engaged in bus-sharing.
Device 'SCSI controller1' is a SCSI controller engaged in bus-sharing.

Please help me resolve it, I attached the copy scrren for settings.
vmotion-error1.png
vmotion-error2.png
vmotion-error3.png
Jason YuAsked:
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Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:
Hi

It depends on the VMs

vMotion on RDM disks is always a problem(if done properly). Is not a normal vMotion.

On you case this is what VMware says:
"Cause
This issue occurs if you have a SCSI controller in use in a virtual machine, which has the bus-sharing mode changed to either virtual or physical. This configuration is used in virtual machines that are running Microsoft Cluster Services (MSCS)."

Since SCSI Bus Sharing controller set to physical and needs to be "none" or "virtual", this is not possible to migrate.

There is some tests around that using some LUN ID or SCSI ID on different hosts and VMs is possible. Honestly I never tested.

This may help

This is some examples:
http://cormachogan.com/2013/12/11/vsphere-5-5-storage-enhancement-part-7-lun-idrdm-restriction-lifted/

http://cormachogan.com/2014/04/15/vsphere-5-5-rdms-and-microsoft-clustering/

Jail
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bleeuwenCommented:
Please also check http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004617 for articles about microsoft clustering on ESX (microsoft)

And check http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003797:

To work around this issue, VMware recommends migrating a virtual machine that is participating in SCSI bus-sharing by powering down the virtual machine that resulted in the error message and performing a cold migration to the new host. For more information on cold migrations, see Cold Migrations from the vSphere 5 documentation Center.
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