aa993491_ZFS_Fun___Funtoo__BTRFS
[Feature] Data blocks reoptimization [ZFS] NO [Remarks] ZFS is missing a "block pointer rewrite functionality", true on all known implementations so far. Not a major performance crippling however. BTRFS can do on-line data defragmentation. [BTRFS] 
YES
Y E S
N O
ZFS Fun - Funtoo
BTRFS