topic Re: SolidFire HCI vSphere RDM configuration with LUN ID's in SolidFire and HCI

SolidFire HCI vSphere RDM configuration with LUN ID's

arnoldromeijn — Wed, 04 Jun 2025 12:14:32 GMT

My lun's from the SolidFire storage are assigned LUN ID 0 in vSphere using iSCSI.

When using RDM's to create disks for a SQL cluster, the RDM's cannot be added to the second node.

Error:Incompatible device backing specified for device ‘0

See https://kb.vmware.com/s/article/2054897

Is there a way to make this work?

Re: SolidFire HCI vSphere RDM configuration with LUN ID's

Ontapforrum — Thu, 19 Sep 2019 14:05:41 GMT

I haven't worked with SolidFire but looks like it's a well known error on the VMware blogs.

Some pointers :

https://cormachogan.com/2013/04/08/microsoft-clustering-on-vsphere-incompatible-device-errors/

https://kb.vmware.com/s/article/2054897 (workaround)
1) While adding hard disk to additional nodes of cluster, instead of selecting Existing Hard Disk under New device drop-down menu, select RDM Disk under New device drop-down menu and click Add.
2) Select the LUN naaid which was added to the first node of the cluster. The LUN number may be different on this host.
3) Verify that disk got added successfully.

https://communities.vmware.com/thread/544475

Re: SolidFire HCI vSphere RDM configuration with LUN ID's

arnoldromeijn — Thu, 10 Oct 2019 09:25:10 GMT

I tried the VMware workaround. That did not work also.

We setup vvols and were able to add these as shared disks to the Windows cluster.