I started receiving a warning that I had reached 80% of the total space for my storage pool. [Screenshot 2025-09-29 125614] Meanwhile, the underlying volume is only at 43%. [Screenshot 2025-09-29 125636] I need help understanding what action I should take to address this.

Hi, you can change the alert to 90 %. your Thick-volume use 78, 42 % and your snapshot use 1,53% → pool is over 80% (80,05%) Why is my storage pool full when there is still free space in my thick volume? | QNAP

Thanks @Becker2020 - that was exactly what I was looking for.

This is one reason why thin volumes are a little more flexible. They don’t take up the physical space on the drive until they actually need it. So that “empty” space can be used for snapshots, other volumes, etc.

@NA9D is it a straight-forward thing to convert a thick volume to a thin one?

No. But i think a thick-volume is better for you. thin-volume !!! The size of a thin volume can be greater than that of its parent storage pool. This is called over-allocation. The pool free space is shared among all thin volumes, and the NAS administrator must take care to ensure there is enough…

After having used both thick and thin volumes, I would much rather use thin. Yes, you can over allocate and this is especially easy in QuTS Hero. I am quite over-allocated. But it allows very flexible storage and shared folder operations. And I found it quite easy to convert. I think there’s an…

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