When running

rsync -Paz /home/sbird "/run/media/sbird/My Passport/sbird"

As told by someone, I run into a ran out of storage error midway. Why is this? My disk usage is about 385 GiB for my home folder, and there is at least 800 GiB of space in the external SSD (which already has stuff like photos and documents). Does rsync make doubly copies of it or something? That would be kind of silly. Or is it some other issue?

Note that the SSD is from a reputable brand (Western Digital) so it is unlikely that it is reporting a fake amount of storage.

  • sbird@sopuli.xyzOPEnglish
    1·
    7 hours ago

    using du -hsc returns 384G with /home/sbird, and 150G inside the external SSD (when it does not have any of the files transferred with rsync)

    • [object Object]@lemmy.world
      1·
      7 hours ago

      Well, that’s not what I meant. If you have directories with torrents or VMs, du might report different size for those directories on the source and target disks. Then it might’ve meant that those are the culprits.

      With just the source disk, you can check du -hsc dirname versus du -hsc --apparent-size dirname to check if the disk space used is much smaller than the ‘apparent size’, which would mean there are sparse files in the directory, i.e. not fully written to disk. rsync would copy those files to full ‘apparent size’.

      As mentioned elsewhere, btrfs might also save space on the source disk by not writing duplicate files multiple times — but idk if du would report that, since it’s specific to btrfs internals.