Every time I run ratterplatter[1], I really miss slow computers with a
hard disk. And no GUI -- just DOS with one program running at a time.
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I just read on the XFS mailing list[2] that "copy on write" might be
available in stable XFS, soon. I also realized that "CoW in XFS" does
not mean that XFS will be the new btrfs. It "only" means that you can
perform file copies using CoW, but the rest of the filesystem remains
the traditional XFS. It's not like every file operation will be CoW
all of a sudden, like it is in ZFS.
I guess that I, personally, would gain very little from reflink
copies. What's much more interesting for me is snapshots. That would
be huge (yuge!).
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1.
https://github.com/vain/ratterplatter
2.
https://www.spinics.net/lists/linux-xfs/msg09685.html