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  • Sparsity vs sparseness - English Language Usage Stack Exchange
    What is the difference between sparsity and sparseness? Is it that the latter emphasises the extent to which something is sparse? I'm not sure I can see the thin line that separates them
  • Why does reading a file with hexdump sometimes change finds sparseness . . .
    I noticed that behavior on several files Examples of changes of find's sparseness values (%S): 0 000135559 to 0 631297 0 00466808 to 0 228736 Is it because the file is being cached partly locally when reading with hexdump? I noticed that this change isn't specific to hexdump, e g the same happens with nano (and likely any other program that read the file): dernoncourt@server: videos$ find
  • How to get the actually used size of a sparse file?
    I would like to know, how much is a sparse file really using on the disk ls, stat and similar commands all seem showing its virtual size, i e with the holes I want to know the real disk usage of the file, without the holes How can I do that?
  • How do I output sparseness of a file? - Unix Linux Stack Exchange
    Wonder what the sparseness of that should be Besides, isn't that definition the wrong way around, surely a normal (i e non-sparse) file should have sparseness zero?
  • Finding sparse files? - Unix Linux Stack Exchange
    27 Is there a straightforward way to find all the sparse files on my system, or in a particular directory tree? If it's relevant, I'm using zsh on Ubuntu 12 04, although a more generic Unix-y answer for bash sh, for example, would be fine Edit: to clarify, I'm looking to search for sparse files, not check the sparseness status of a single one
  • What are functions to manipulate sparse files under Linux?
    On Linux, you can retrieve details of files’ sparseness using the fiemap ioctl, and e2fsprogs ’ filefrag(8); see Detailed sparse file information on Linux On the writing side, you can use fallocate(2) (and the handy fallocate(1) utility) to punch holes in an existing file, making it sparse if the holes cover entire blocks
  • How to reach optimal speeds with rsync? - Unix Linux Stack Exchange
    I am using rsync to sync around ~2TB of data to a mechanical HDD-5400RPM It's taking way too long How can I improve the sync and check speeds to get as close as possible to maximum optimal? Here
  • Understanding sparse files, dd, seek, inode block structure
    Some copying utilities have options to preserve sparseness, eg tar --sparse, rsync --sparse Note, you can explicitly convert the suitably aligned zero blocks in a file to sparseness by using cp --sparse=always and the reverse, converting sparse space into real zeros, with cp --sparse=never
  • hard disk - Is dd a reliable tool to make an SSD image? - Unix . . .
    Although I think sparseness detection works in units of the bs, so you might want a smaller block size like 16k For a device that might have read errors, certainly ddrescue is a very good choice, but other than that you don't need it If you know its options then by all means use it
  • Tell if a file is a sparse file - Unix Linux Stack Exchange
    The accepted answer there is quite straightforward -- a one-liner The find part will need to be tailored for your requirements -- as posted, it searches all files from the root directory The format after the -printf uses %S to show the estimated proportion of 'real' data blocks, and %p to show the pathname This is piped to an awk script which only lists the files that use fewer disk blocks





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