capacity of secondaey stor us eq 0. bug ir known ussue?

[Netmaster]

Hallo,
we have several installation of cloudstack 4.2
In dashboard the capacity of secondary storage equal 0kb
We have standart nfs.
Api backed the same error, capacity of resource type 6 is 0
The secondary stor vm (system vm) shows normall capacity of 10tb, 
as it have to be.
Is it bug or known issue?
Thanks