How to migrate C drive for VMs with RDMs ?

[MICDROP]

Hi all

I'm using VM with RDMs (C Drive is Virtual disk)

I have to migrate this VM, so I try migrate using advanced option, but it affect RDMs too.

RDM disks are physical, I know they can not be migrated, and I don't need migrated to virtual disks.

How can I migrate only drive C to a different datastore?

My stupid idea is detach the RDM to VM for a moment.

 

I'd appreciate your advice!

Regards.

[ashilkrishnan]

Hi  MICDROP,

There is a drop down for storage when you select 'Configure per disk'. Drop down and change datastore only for C: drive.

For example refer attached screenshot

[MICDROP]

Hi @ashilkrishnan 

Thank for reply.

Yeah, I know the drop-down, but... I can't except RDM disks like a screenshot, and I have to migrate it to a datastore somewhere..

Is there another way?? 😂

[ashilkrishnan]

Is the drop-down option grayed out for the non-rdm disks ? If not, then you should still be able to migrate just those disks and the RDM disks will remain intact.

[nachogonzalez]

Are you able to storage vMotion the single disk?

Else, I would try a cold migration.

[MICDROP · Accepted solution]

@ashilkrishnan @nachogonzalez 

Hi.

https://kb.vmware.com/s/article/1005241

I found the KB as above.

Perhaps in my case, I have to detach RDM disks and migrate C drive, re-attach RDM disks.. : )

[ashilkrishnan]

You go the right KB there. Yes, you can detach the physical RDMs and attach them post migration of C: drive

[nachogonzalez]

Detaching the disk might work.
Another option would be a cold migration.


Please keep in mind that for the RDM to work the RDM lun has to be presented to the destination host.