Hello,
I have a VirtualBox hard drive image which is quite fragmented even
after very light use; it is 1.6 GB in size and has around 5000 fragments
(I'm using "filefrag" to determine the number of fragments). Doing a
"btrfs fi defrag -f image.vdi" reduced the number of fragments to 3749.
Even doing a "btrfs fi defrag -f -t 1 image.vdi" which should make sure
every extent is rewritten (according to the btrfs-progs 3.14.2 manpage)
does not yield any better result and seems to return immediately.
Copying the file, however, yields a copy which has only 5 fragments
(simply doing a cp image.vdi image2.vdi; sync; filefrag image2.vdi).
What do I have to do to defrag the file to the minimal number of
fragments possible? Am I missing something?
Kernel version 3.15.5, btrfs progs 3.14.2, Arch Linux.
Best regards,
Sebastian
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