Proxmox backups

proxmoxbackup.pngI have set up backups through the Proxmox Backup screen on the web interface using snapshot mode (screenshot attached). I'm backing up to a 1.5TB external USB drive. For smaller VMs, the backups work just fine. For the two large VMs, over 100GB, the backups hang. I was able to get one of the larger vm's to backup using suspend mode, but I would rather use snapshot.

Below is lvs when the backup fails. The backup hangs when snap% 100. The LSize is 100MB in this example, but i've set it as high as 4GB. Same result every time. If I set it higher than 4GB, I get a this error: Insufficient free extents (1023) in volume group pve: 2500 required.

virt0:/etc# lvs
/dev/dm-2: read failed after 0 of 4096 at 0: Input/output error
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
data pve owi-ao 1.65T
root pve -wi-ao 96.00G
swap pve -wi-ao 15.00G
vzsnap-virt0-0 pve Swi-Io 100.00M data 100.00


Here is lvdisplay when snap% gets to 100.


virt0:/etc# lvdisplay /dev/pve/vzsnap-virt0-0
/dev/dm-2: read failed after 0 of 4096 at 0: Input/output error
--- Logical volume ---
LV Name /dev/pve/vzsnap-virt0-0
VG Name pve
LV UUID qQdp5E-XdxW-8Wf8-FZcO-DajF-eWwf-Ccde2B
LV Write Access read/write
LV snapshot status INACTIVE destination for /dev/pve/data
LV Status available
# open 1
LV Size 1.65 TB
Current LE 431232
COW-table size 100.00 MB
COW-table LE 25
Snapshot chunk size 4.00 KB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 251:2



Any ideas how to get the backup to work in snapshot mode? What exactly is snap% and why is it getting to 100?

Thanks!

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