Proxmox - Disks - Remove Device Mapper usage

List the disk partitions 

lsblk -f

returns: 

NAME                   FSTYPE      LABEL UUID                                   FSAVAIL FSUSE% MOUNTPOINT
sda                                                                                            
├─sda1                                                                                         
├─sda2                 vfat              8B1B-5126                               510.7M     0% /boot/efi
└─sda3                 LVM2_member       MA9I5I-auY3-MWGS-94Ad-6x3k-uuXl-nlhNQ9                
  ├─pve-swap           swap              3c213912-aa63-4daf-a2f1-c7926012e862                  [SWAP]
  ├─pve-root           ext4              7673ba15-2fd7-4dd2-844a-fda9850af328     51.3G     5% /
  ├─pve-data_tmeta                                                                             
  │ └─pve-data                                                                                 
  └─pve-data_tdata                                                                             
    └─pve-data                                                                                 
sdb                                                                                            
sdc                                                                                            
└─VM1-vm--100--disk--0                                                                         
sdd                                                                                            
sr0

NOTE: The sdc disk shows that VM1-vm–100–disk–0.

The usual approach to remove a partition from a disk does not work; i.e. by running this: 

fdisk /dev/sdc
  • p (to print partitions),
  • and d (to delete a partition),
  • and w to write.

Solution

Try the following options:

WARNING: Ensure the correct device is used with these commands, as it will wipe all the data on the specified disk! 

wipefs -a -f /dev/sdc partprobe /dev/sdc pvesm scan

or 

gdisk /dev/sdc

or 

sgdisk --zap-all /dev/sdc

NOTE: A reboot might be needed of Proxmox to show the fresh results.