On 24 June 2015 at 12:46, Duncan <[email protected]> wrote: > > Regardless of whether 1 or huge -t means maximum defrag, however, the > nominal data chunk size of 1 GiB means that 30 GiB file you mentioned > should be considered ideally defragged at 31 extents. This is a > departure from ext4, which AFAIK in theory has no extent upper limit, so > should be able to do that 30 GiB file in a single extent. > > But btrfs or ext4, 31 extents ideal or a single extent ideal, 150 extents > still indicates at least some remaining fragmentation.
So I converted the VMware VMDK file to a VirtualBox VDI file: -rw------- 1 plu plu 28845539328 jul 13 13:36 Windows7-disk1.vmdk -rw------- 1 plu plu 28993126400 jul 13 14:04 Windows7.vdi $ filefrag Windows7.vdi Windows7.vdi: 15 extents found $ btrfs filesystem defragment -t 3g Windows7.vdi $ filefrag Windows7.vdi Windows7.vdi: 24 extents found How can it be less than 28 extents with a chunk size of 1 GiB? E2fsprogs version 1.42.12 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
