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Cache disk (SSD) showing 150 - 300 KB/s writes while system is idle

jude
in General Support

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So I noticed that I can toggle the GUI buttons on the Main tab so that I can see disk IO for all of my drives. I was surprised to see that the Cache SSD (Samsung 850 Pro 512GB) is showing what I would say are significant writes while the system is idle (150 - 300 KB/s).

 

If I shutdown all the Docker apps that I have running then this write behaviour does mostly stop. The cache is using BTRFS and I was wondering if BTRFS's copy on write format is causing the write behaviour. There are no reads happening during these idle states.

 

I did try to see what was causing this activity using IOTOP but it is hard to tell as the lines flash by pretty quickly.

 

The cache is used to host my docker apps and a Windows 10 VM. Would I be better off to change to XFS and would this reduce the idle writes?

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