Mounting and dismounting SAN drives in Hyper-V

I have a Hyper-V server running a database VM.  I want to backup the SAN drive that is directly connected to that VM.  When we setup the VM we connected the SAN drive to the hyper-v server and, per documentation, took it offline and attached it to the VM.

I need to remove this drive from the VM, copy the files (I can't from inside the VM due to other constraints) and remount the drive on the VM.  This sounds simple in theory but I fear dismounting the drive and not getting it back online.  Is this a straightforward thing that I am being paranoid about or am i right to be worried?

Any advice on how to safely dismount, clone and remount this SAN drive in hyper-v will be greatly appreciated.
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Svet PaperovIT ManagerCommented:
If I understand right, the drive is connected as pass-through drive to the VM, is that correct?

If that is the case, you don’t have options to back it up outside of the VM. The only way I see is a manual job:
1. Stop the VM
2. Bring the disk online on the Hyper-V server
3. Map it as a local drive on the Hyper-V server
4. Backup the files
5. Bring it offline again
6. Start the VM

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What spaperov said. You should really avoid dismounting the disk from the VM while the VM is running as there might be data written to it. A sudden disconnect can lead to data loss.
If the pass-through disk is connected to a virtual SCSI-bus on the VM, you can "safely remove device" from within the windows VM.
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