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Btrfs system not using CoW?

Bjarni85
in General Support

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I have 3 HD, all using btrfs. 

When I copy folders from download share to TV share I get the usual ~100mb/s copy speed. I thought that it was supposed to be "instant" because of CoW...? I've tried to copy from disk1/download to disk1/TV but the same thing happens. (I know CoW doesn't work between disks obviously). 

Can anyone explain to me why this isn't working like I thought it would?

  • Quote
    • Community Expert

    How are you copying? It will only work like that with cp --reflink, e.g.:

      

    cp --reflink /mnt/disk1/Downloads/file.mkv /mnt/disk1/TV/file.mkv

     

  • Quote
    • Author

     

    Thank you!!

     

    I didn't know I had to use --reflink. I thought CoW was the default behaviour. 

     

    Have a great weekend and thank you so much :)

  • Quote

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