Better fill those files with random bytes, to ensure the filesystem doesn’t apply some “I don’t actually have to store all-zero blocks” sparse-file optimization. To my knowledge no non-compressing file system currently does this, but who knows about the future.
A good way to do this is to create a swap file, both because then you can use it as a swap file until you need to delete it and because swap files are required to not be sparse.
XFS, Ext4, btrfs etc… all support sparse files, so any app can cause problems you can try it with:
dd if=/dev/zero of=sparse_file.img bs=1M count=0 seek=1024
Much harder problem than the file system layers to deal with because the stat size will look smaller usually.
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No, just use LVM or other dynamic volume management.
Shit like that just wastes space that SSD could use for wear levelling...
If I recall correctly:
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