Preferred Disk Sharing Mode for Active-Active Oracle RAC Clustered VMs using physical RDM

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VMware vCenter Server VMware vSphere ESXi

This article explains about the preferred Disk Sharing Mode for Active-Active Oracle RAC Clustered VMs using physical RDM.

VMware vSphere 7.x

VMware vSphere 8.x

Disk "Sharing" Mode:

The Disk "Sharing" option is meant for VMDKs or virtual RDMs (vRDM) only.
It is not for use with physical RDMs (pRDM) as they are not "VMFS backed".
So if your environment is utilizing physical RDMs (pRDM) then Disk "Sharing" setting can be remain to default "No sharing" value.

Shared physical RDM(s) for Oracle RAC VMs require:

SCSI bus sharing is set to Physical
Disk Compatibility mode for the shared RDM is set to physical for Physical compatibility mode

Example: For the Active-Active Oracle RAC VMs using physical RDMs (pRDM), the recommended VM settings will be like:

SCSI Adapter setting:

Change Type: Paravirtual
SCSI bus sharing: Physical

Disk setting:

Sharing: No-Sharing
Disk Mode: Physical capability mode

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