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Attaching Local Storage as a RDM

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Let me start off by stating that this is NOT supported…..

I wanted to attach a local drive to a VM, but wanted the ability to move this drive to a physical Windows server at a later time without the time consuming data migration or drive reformatting. Although there is no way to do this through the VIC, there is a way to do this in the console.

First we need to find the disk we want to use as an RDM. This is accomplished by running the following:

ls -al /vmfs/devices/disks/

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In this example the disk I needed was vmhba0:1:0:0….. Take note of  the string starting with vml.

Now we need to create the placeholder vmdk we will attach to our vm. We do this with the following command:

vmkfstools -r /vmfs/devices/disks/vml.<String we retrieved above> /vmfs/volumes/<Existing DataStore>/<VM Path>/<NAME>.vmdk

Now the only thing we need to do is to add the existing disk to our VM. You will notice the summary shows the new disk as a “Mapped Raw LUN”

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Fire up the VM and format the disk for whatever file system you require.

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Enjoy


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