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On Sat, Nov 26, 2011 at 7:14 PM, Rich Freeman <firstname.lastname@example.org> wrote:
> isn't supported. It is available in stable coreutils. Some speculate
> that this option could increase fragmentation (both copies will share
> extents from the original file, and have some extents of their own),
> but btrfs doesn't overwrite anything in-place so fragmentation is a
> potential issue with any file modification (change one byte in the
Adding to your comments on this:
To mitigate such issues, newer versions of the btrfs fs driver have
automatic online defragmentation as well. Works quite well for
A particularly ghastly example where fragmentation issues become
pathological in nature are files that are fsync()ed very frequently. A
typical example are the *.sqlite files in ~/.mozilla which easily get
hundreds or even thousands of fragments after a few hours worth of
firefox usage (can be verified with filefrag).
To fix such things, regular online defragmentation of those specific
files can be done using `btrfs fi defrag <file>`.
Gentoo GNOME+Mozilla Team