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I want to investigate what keeps my drives spinning on my nas. Which commands help me to get insight on which files are being opened and preventing my disks to sleep?

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  • sometimes its enough if smartd is running ... or a new ext4 filesystem is still doing the lazy init ... maybe related unix.stackexchange.com/a/533796/30851 Commented Mar 3, 2024 at 10:23
  • btrace can be handy: it "traverses" all block layers. Commented Mar 3, 2024 at 17:22

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If I got it correctly, you should use the lsof command:

lsof | grep /path/to/your/disk

This command will show you which processes have files open on that disk.

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  • This will not work if you run docker containers. The opened files will not show up Commented Mar 3, 2024 at 21:06
  • @faze you didnt ask for Docker... Its better to add Docker to your question. Commented Mar 3, 2024 at 22:57
  • Open files do not necessarily mean they are being read from/written to. An application may create and delete files. Commented Mar 4, 2024 at 9:13
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Try sudo fatrace --timestamp --filter='WD<>+'

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