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What is writing to my array?


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Without any "planned or known" activity, my array drives get activated every few seconds with very small writes, like in this screenshot:




How can I find out what processes / applications / dockers / younameit are responsible for this activity, as it prevents my disks from going to sleep?


I checked my configuration and as far as my understanding goes, my "cache" setup and parameters for the shares are correct, and writes should go to the cache drive, not directly to the array...


Many thanks,



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Hi all,


A quick update on this, I believe I have solved the issue. What I did is:

  1. Triple-check my cache settings (Yes, Prefer, Only etc) and the various path mappings for my dockers : OK 
  2. Stop the docker service
  3. Invoke the Mover manually and let it do its job
  4. Restart docker and its containers
  5. Observe - all good!

So I believe I somehow had a misconfiguration at the beginning of my unRAID installation and configuration, and then transferring a few TB worth of data through the cache (rookie mistake), the cache drive filling up, and some "Prefer cache" shares being offloaded to the hard disks because of lack of space.


Now, all looks good!

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