Passthrough disks and snapshots

[saltarob]

Why do you want to have raw at all? Just stay with a storage system that supports snapshots.

First I am assuming that it is raw. That was part of my question after I tried the suggested command:

root@pvemacpro:/dev/pve# qemu-img snapshot -c snap1 vm-104-disk-6
WARNING: Image format was not specified for 'vm-104-disk-6' and probing guessed raw.
         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.
qemu-img: Could not create snapshot 'snap1': -95 (Operation not supported)

Second, it's the file format Proxmox decided to use for the boot disk. It's not my choice...?

 

[LnxBil]

Yes, it looks like LVM and therefore only allows snapshots if it is a thin-lvm. Please post the output (in code tags) from the commands pvs, vgs and lvs. You want want to look at the storage overview in order to get a glimpse of what is possible.

 

[saltarob]

Thank you for the follow up.

root@pvemacpro:~# pvs
  PV         VG  Fmt  Attr PSize  PFree 
  /dev/sdb3  pve lvm2 a--  <2.73t <16.25g
root@pvemacpro:~#

root@pvemacpro:~# vgs
  VG  #PV #LV #SN Attr   VSize  VFree 
  pve   1  33   0 wz--n- <2.73t <16.25g
root@pvemacpro:~#

root@pvemacpro:~# lvs
  LV                                            VG  Attr       LSize   Pool Origin                                        Data%  Meta%  Move Log Cpy%Sync Convert
  base-101-disk-0                               pve Vri---tz-k   4.00m data                                                                                     
  base-101-disk-1                               pve Vri---tz-k 150.00g data                                                                                     
  base-102-disk-0                               pve Vri---tz-k   4.00m data                                                                                     
  base-102-disk-1                               pve Vri---tz-k 150.00g data                                                                                     
  data                                          pve twi-aotz--  <2.58t                                                    6.23   0.52                           
  root                                          pve -wi-ao----  96.00g                                                                                           
  snap_vm-100-disk-0_Backup-2023-08-13          pve Vri---tz-k   4.00m data                                                                                     
  snap_vm-100-disk-0_Backup_2023-08-14_01       pve Vri---tz-k   4.00m data                                                                                     
  snap_vm-100-disk-0_Backup_2023-08-16_HSVE-EFI pve Vri---tz-k   4.00m data                                                                                     
  snap_vm-100-disk-0_Test_2023-08-16            pve Vri---tz-k   4.00m data                                                                                     
  snap_vm-100-disk-1_Backup-2023-08-13          pve Vri---tz-k  64.00g data                                                                                     
  snap_vm-100-disk-1_Backup_2023-08-14_01       pve Vri---tz-k  64.00g data                                                                                     
  snap_vm-100-disk-1_Backup_2023-08-16_HSVE-EFI pve Vri---tz-k  64.00g data                                                                                     
  snap_vm-100-disk-1_Test_2023-08-16            pve Vri---tz-k  64.00g data                                                                                     
  snap_vm-103-disk-0_CleanInstall_2023-08-17    pve Vri---tz-k   4.00m data vm-103-disk-0                                                                       
  snap_vm-103-disk-1_CleanInstall_2023-08-17    pve Vri---tz-k 150.00g data vm-103-disk-1                                                                       
  snap_vm-104-disk-1_Backup_2023-08-18          pve Vri---tz-k   4.00m data vm-104-disk-1                                                                       
  snap_vm-104-disk-1_CleanInstall_2023-08-18    pve Vri---tz-k   4.00m data vm-104-disk-1                                                                       
  snap_vm-104-disk-1_UBS-Device-Back_2023-08-20 pve Vri---tz-k   4.00m data vm-104-disk-1                                                                       
  snap_vm-104-disk-1_USB-PCI-Test_2023-08-20    pve Vri---tz-k   4.00m data vm-104-disk-1                                                                       
  snap_vm-104-disk-6_Backup_2023-08-18          pve Vri---tz-k 120.00g data vm-104-disk-6                                                                       
  snap_vm-104-disk-6_CleanInstall_2023-08-18    pve Vri---tz-k 120.00g data vm-104-disk-6                                                                       
  snap_vm-104-disk-6_UBS-Device-Back_2023-08-20 pve Vri---tz-k 120.00g data vm-104-disk-6                                                                       
  snap_vm-104-disk-6_USB-PCI-Test_2023-08-20    pve Vri---tz-k 120.00g data vm-104-disk-6                                                                       
  swap                                          pve -wi-ao----   8.00g                                                                                           
  vm-100-disk-0                                 pve Vwi-a-tz--   4.00m data snap_vm-100-disk-0_Backup_2023-08-16_HSVE-EFI 14.06                                 
  vm-100-disk-1                                 pve Vwi-a-tz--  64.00g data snap_vm-100-disk-1_Backup_2023-08-16_HSVE-EFI 37.14                                 
  vm-100-state-Backup_2023-08-16_HSVE-EFI       pve Vwi-a-tz-- <62.99g data                                               20.19                                 
  vm-100-state-Test_2023-08-16                  pve Vwi-a-tz-- <62.99g data                                               15.07                                 
  vm-103-disk-0                                 pve Vwi-a-tz--   4.00m data                                               14.06                                 
  vm-103-disk-1                                 pve Vwi-a-tz-- 150.00g data                                               12.75                                 
  vm-104-disk-1                                 pve Vwi-a-tz--   4.00m data                                               14.06                                 
  vm-104-disk-6                                 pve Vwi-a-tz-- 120.00g data                                               47.73                                 
root@pvemacpro:~#

 

[LnxBil]

So it is already Thin-LVM and you can create snapshots on it - you already did.

 

[saltarob]

Yes, I mentioned that I did already snapshots but if I passthrough a disk then the VM snapshot feature is blocked, which is the topic of the thread.

 

[Neobin]

For reference:
https://bugzilla.proxmox.com/show_bug.cgi?id=3912

 

[saltarob]

Okay, thank you.