PBS Disk usage not match

[proxstormer]

Dear all,

After a GC I see this numbers on the final report:

2024-02-16T22:41:48+01:00: Removed garbage: 0 B
2024-02-16T22:41:48+01:00: Removed chunks: 0
2024-02-16T22:41:48+01:00: Pending removals: 418.178 GiB (in 218615 chunks)
2024-02-16T22:41:48+01:00: Original data usage: 34.419 TiB
2024-02-16T22:41:48+01:00: On-Disk usage: 5.553 TiB (16.13%)
2024-02-16T22:41:48+01:00: On-Disk chunks: 2571836
2024-02-16T22:41:48+01:00: Deduplication factor: 6.20
2024-02-16T22:41:48+01:00: Average chunk size: 2.264 MiB
2024-02-16T22:41:49+01:00: TASK OK

But on the dashboard appears following Datastore usage:
Size: 7.54 TB
Used: 6.94 TB
Usage: 92.12%

As you can see there are a discrepancy on the disk usage:

GC: On-Disk usage: 5.553 TiB
Datastore: Used: 6.94 TB

There are aprox. 1.5 TB that is used but it seems not be useful data, what is happening? May be is garbage not detected by GC?

This is a pattern that I saw on Pbs from my first install, but I don't understand.

 

[Dunuin]

Do you maybe store other stuff on those disks as well or do you got multiple datastores on the same filesystem? The webUI won't report the size of your chunks. It simpy shows what usage the filesystem is reporting no matter what the data is used for.
And maybe there is data that got deleted but isn't trimmed yet (ZFS for example will only trim (free up space) the pool once per month)?

 

[proxstormer]

Thanks for your response.
My PBS has two disk one for system other for datastore.
The datastore disk is exclusively used by PBS.
I don't use zfs only ext4.
I have only one datastore in the disk.