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I'm running tests that require some files to be heavily fragmented. I came up with a method to generate fragmented files, but something is working in the background to defragment them. I'm using hdparm --fibmap and I see it start out with thousands of fragments, then a lot of disk IO later, I see it have under a hundred fragments.

Is it possible to disable this?

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Ext4 doesn't "defragment" file's in the background. At most it will delay block allocation and then merge writes to the file.

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