On 21/03/2019 16:05, Theodore Ts'o wrote: > It *could* be read sequentially from the beginning of the file to the > end. There are many things that might cause that not to happen, that > have nothing to do with how we store the logical to physicla map. And this is what I wanted to know, because some people tell that if you store a file in a filesystem, it can't be read sequentially as a whole because of the filesystem layer (compared to "dd if=/dev/sda ..."). So the filesystem layer doesn't really matter and doesn't really add any additional delays compared to the raw read of a device when we deal with data that is stored in contiguous blocks. I know that many things can prevent the sequential read from happening, but I just wanted it to be clarified. Thank you for the answer, I really appreciate it.
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