How to configure rdm (Raw Device Mapping) in VMware
Welcome back Guys, Todays Session will cover the following topics about Raw Device Mapping (RDM)
-Why do we use RDM?
Quorum Disk for Microsoft Clustering
SQL Databases
Failover SQL / Cluster with Active-Passive mode required RDM
-Diffrent types of Raw Device Mapping (RDM)
Physical -Raw Device Mapping (PRDM)
Virtual -Raw Device Mapping (VRDM)
We can add a new storage controller to separate VMDK and RDMS
Compatibility mode Virtual or Physical
What is Compatibility Mode?
Physical - Allows the guest OS to access the hardware directly.
No Snapshots can be taken of P-RDM
Virtual – Allows the Virtual Machine to use VMware Snapshots and other advanced functionality.
RDM Must be located on a separate SCSI Controller
Use a different SCSI BUS to the current virtual disks ( VMDKS)
example
SCSI (1:0) -for first RDM
SCSI (1:1) – for the second RDM
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Reference:
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