Example of how to attach a disk from one vm to another.

[Smithx10]

While trying to attempt some automation, we hit a snag where we could not figure out how to Add / Attach a vmdk from 1 vm to another.

Is there some simple steps on how to do this? I've had to no luck. An example in the documentation would be helpful.

[github-actions]

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[dougm]

Hi @Smithx10 , are you looking to do this with govc or with the API?

[Smithx10]

I found it here: Not sure if this is the only way, but it worked. Was a bit of a strange to get a disk from a VM and then have to override its size to 0 to Add it to another machine.

		// Need FileOperation=="" to add an existing disk, see object.VirtualMachine.configureDevice
		disk.CapacityInKB = 0
		disk.CapacityInBytes = 0
		if err = vm.AddDevice(ctx, d); err != nil {
			t.Error(err)
		}

govmomi/simulator/virtual_machine_test.go

Line 513 in 314c652

// Need FileOperation=="" to add an existing disk, see object.VirtualMachine.configureDevice

[dougm]

Yes, that is a bit strange, you can use the spec+method underneath AddDevice to avoid that. But, you may want to considering using FCD (First Class Disk) instead. Recent example went in:
https://github.com/vmware/govmomi/blob/main/govc/disk/attach.go#L96
https://github.com/vmware/govmomi/blob/main/govc/disk/detach.go#L65