Hello, I have an Unraid server and I'm running into a specific issue. I have a cache pool with a 1TB SSD, and it always seems to be full. Right now, I only have around 200GB left out of 900-something, and I’d like to free up more space because I need to copy a large file to the server. But whenever I try to copy it, it tells me there’s no space left. I assume the cache pool is supposed to flush or offload to the array on its own, but it's been a few days now and it's still full.
Is there a tool or a method to force the cache to empty itself faster? I’ve already looked into it a bit on my own, and all I managed to try was “scrub,” but it didn’t help. So, is there a way to manually trigger the cache to flush, or did I break something?

You are likely to get better informed feedback if you attach your system’s diagnostics (with everything in the one zip file) to your next post in this thread. It is always a good idea when asking questions to supply your diagnostics so we can see details of your system, how you have things configured, and the current syslog. Also mention the name of a share(s) that you think the system should be moving to the array.

OK, I’ve started the creation of the diagnostic ZIP, but I can see during its creation that it’s currently writing the name of every file on my NAS. That seems a bit excessive in terms of personal data protection.I started creating the ZIP file for diagnostics, but when I look at what's being written inside, it seems to list the names of all the files on my NAS. I feel like this goes way beyond user file protection

You likely have the mover logging enabled, and it's anonymizing those files, you can disable that, reboot, and then grab new diags.

I'm not sure if my mover log is enabled, but here is the Unraid diagnostic. It took me a while to generate it, sorry for the delayed response.

tower-diagnostics-20250724-1921.zip

What is the share name you are writing to?

In my Cache folder, I have domains and appdata.
So my VM and Docker are taking space there.
But how can I make them take up less space?

52 minutes ago, W01F said:

But how can I make them take up less space?

You would need to move or remove them.

You didn't mention the share name you are writing to.

Ah, excuse me. All the shares were set to 'cache → array' while I was trying to fix my issue. But while browsing in the terminal, I noticed that the appdata and domains folders were still taking up space on the cache drive. So it turns out those two share folders need to be redistributed to the array.

So if I understand correctly, if I want to empty my cache, I can manually move the files.
For example:
mv "/mnt/user/cache/domains/BIG_FILES/" "/mnt/disksWITHSPACE/domains/BIG_FILES/"

??

You can do that; just don't copy/move from disk shares to user shares (/mnt/user/share) and vice versa.

Sorry, English is not my first language. What do you mean?

Just don't copy from a disk share to a user share, what you mentioned is fine.

ok thank you :)