[Backup NG] Backup size on Restore page is way off

[mas90]

Context

• XO origin: the sources
• Versions:
  • Node: v8.16.0
  • xo-web: v5.44.0 2902488
  • xo-server: v5.44.0 2902488

Expected behavior

Backup sizes shown on /backup-ng/restore should be accurate.

Current behavior

Backup size is very much higher than the actual disk usage, for many (not all) VMs.

One example: the UI shows that a VM's backups total 837.83 GiB (3 full + 17 delta backups). Clicking the delete button shows accurate sizes for the full backups (about 2 GiB each). Actual file size on disk is 31 GiB (of which 25 GiB are deltas).

Additionally, several of my VMs show the exact same backup size (837.83 GiB) even though the backups on disk are different sizes.

The backup remote is NFS + zfs; zfs has compression turned on so the actual disk usage is lower (18 GiB) in case that is throwing off the calculation somehow.

[Enishowk]

Hi, to be sure, you only have the display for full vm backup when you click on delete button. There is no display for the delta?

Because, currently we only display the total size of full vm backup on the column "size". Later, we will add to this total, those of delta backup

[mas90]

Correct, I only see sizes for full backups:

Size column for that VM's backups currently reads 812.1 GiB -- if it is only counting full backups it should read 6.1 GiB.

[Enishowk]

Hi, I need more information like the json of your backups on this remote. Can you execute the command xo-cli backupNg.listVmBackups?

If you don't know xo-cli, it's a CLI tool that allows you to interact with xo-server: https://xen-orchestra.com/docs/xo-cli.html

Installation of xo-cli

sudo -s
npm i -g xo-cli

Connection to xo-server

xo-cli --register <XO URL> <XO user> <XO password>

Get id of your remote where the backup is located

xo-cli remote.getAll

The magic command

xo-cli backupNg.listVmBackups remotes=json:'["<remote ID>"]' > dump.json

Thanks for sending me the dump. :)
I'm available if you need help.

[mas90]

Here's the backupNg.listVmBackups json: https://www.cl.cam.ac.uk/~mas90/tmp/dump.json

Thanks for investigating!