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Let's say I copy a file using cp and the proccess returns immedietly because the file was written to cache. Then I leave the PC alone for 1 hour. Nothing special running on it.

Is the cache flushed automatically in this time?

Does it matter if the file (writing to) is a block device file, a mapper file or normal file?

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  • Please avoid what this question describes. Commented Nov 26, 2022 at 15:28
  • @KamilMaciorowski did it Commented Nov 26, 2022 at 17:28

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First of all, the cache is flushed as soon as OS is able to do it. Second, even the least important process has a chance to do its work.

For example, even if you have a super-high priority process, which is constantly touching hard drive, then even a super-low shell operation will have a chance to remind cache that it has some data to flush.

So, the answer is no.

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  • I think you mean "yes". See my edit... Maybe you can answer if this applies to all kind of files like block devices and mapper files ? Commented Nov 26, 2022 at 17:28

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