Does Hammer have more than one copy of meta data

Matthew Dillon dillon at
Tue Jul 14 22:14:24 PDT 2015

:I am refering to the problem mentioned in BTRFS here

    Not sure what that research is supposed to prove.  No copy-on-write
    filesystem should ever try to modify deleted data OR meta-data in-place
    until the block is actually reused for something else.  It would be a
    complete waste of I/O, waste of SSD erase cycles, and waste of time.
    A data recovery tool algorithmically designed for a more traditional
    copy-over filesystem is not going to work well on a COW filesystem,


More information about the Users mailing list