> deleted the originals in logical extent order. Sometimes people call this > "defrag free space" but the use of the word "defrag" can be confusing. > > balance is not btrfs defrag. defrag is concerned with making data extents > contiguous, while balance is concerned with making free space contiguous. Got it. I actually would have understood "defrag free space" and that it differed from file defragmentation (btrfs defrag, xfs_fsr, e4defrag, etc). "Balance" confused me. How do you balance free space when you've got drives of unequal sizes, like my (current) case of a 4-drive array consisting of two 16-TB drives and two 6-TB drives? Phil
