[SOLVED] The disk space cannot be released

[fzk707439381]

My disk space filled up very quickly each time, as shown in the figure below on the proxmox platform, but only 2.4TB was actually used when viewing disk usage in the virtual machine.
This is the third time this has happened, and each time it has only been possible to delete the machine rebuild.We have tried to find the method, such as in the disk Settings to check the discard option, use fstrim -av. But it still can't be solved.




After using fstrim -av,however, the platform still shows that 3.97T is full

 

[Dunuin]

Did you create any snapshots?
Is the LVM on top of a HW raid controller?

 

[fzk707439381]

Did you create any snapshots?
Is the LVM on top of a HW raid controller?

1.I have deleted one of the previous snapshots, which is the same as a2 in October, but there is no change in the disk, and the "RAM" option is not checked in all my snapshots. a3 and a4 are the snapshots taken for disaster recovery in the last two days.

2.You mean raid array? No raid array is configured for the disk.

 

[Dunuin]

Not sure how LVM thin pools handle snapshots but at least with ZFS having a snapshot will prevent freeing up space of stuff that got deleted after the snapshot got taken.

 

[fzk707439381]

Not sure how LVM thin pools handle snapshots but at least with ZFS having a snapshot will prevent freeing up space of stuff that got deleted after the snapshot got taken.

Thanks for your help.After deleting all the snapshots, there is a lot of space, and the snapshot deleted yesterday only takes up a small amount of space, so it does not have a significant effect.