Help with storage size - critical, actually is not

[netaccs]

Hello,
I have freenas 9.10.2
4 WD 3TB HDD with zfs.

Error appear in home screen:
The capacity for the volume 'storage' is currently at 92%, while the recommended value is below 80%.

I used this storage only to make copy of virtual machines, presented via iscsi on vmware
The actual size of used content is ~ 3301 GB. I calculate the size of virtual machines backups.

Where this space is gone, how can access other ~ 4TB of space ?

#zfs list

Thanks in advance !

 

[snaptec]

Snapshots in use?


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[netaccs]

I think no. How / what to check ?

 

[snaptec]

Under Storage -> snapshot tasks or have a look unter Storage -> snapshots if there are any...

 

[netaccs]

No, nothing.

 

[Robert Trevellyan]

Exactly what type of filesystem is zfs_vol?

 

[netaccs]

The problem was that the iscsi does not free deleted files or something similar.
I use this guide to "fix" the space. Now free I have more free space, almost 3TB, according vmware I should have 4.5 TB.