NAME

       mfschunktool - checks chunk integrity offline

SYNOPSIS

       mfschunktool [-f] [-r] [-n] [-e] [-x] chunk_file ...

DESCRIPTION

       mfschunktool  checks  chunk integrity using stored CRC checksums in chunk's header.  It can also 'repair'
       chunk (fix stored checksums). This tool may be useful to check last written chunks  after  possible  data
       corruption (power down etc.)

       Options:

       -f     turn  on  fast  mode  (in  this  mode  only  last block is tested - usually this is enough to find
              corrupted chunks)

       -r     turn on repair mode (if checksums on given chunk don't match then  they  will  be  overwritten  by
              checksums calculated using actual data)

       -n     turn  on  name fixing mode (if the chunk file name is not correct but there is proper file header,
              the tool will rename given file using data stored in the header)

       -e     turn on empty block crc check for 1.0 version chunks (force checking crc values for  non  existing
              blocks - may fail in case of chunks that were truncated)

       -x     turn on reporting successful check (print 'OK' message when everything is correct)

REPORTING BUGS

       Report bugs to <bugs@moosefs.com>.

COPYRIGHT

       Copyright (C) 2023 Jakub Kruszona-Zawadzki, Saglabs SA

       This file is part of MooseFS.

       MooseFS  is  free  software;  you can redistribute it and/or modify it under the terms of the GNU General
       Public License as published by the Free Software Foundation, version 2 (only).

       MooseFS is distributed in the hope that it will be useful, but WITHOUT ANY  WARRANTY;  without  even  the
       implied  warranty  of  MERCHANTABILITY  or  FITNESS  FOR A PARTICULAR PURPOSE. See the GNU General Public
       License for more details.

       You should have received a copy of the GNU General Public License along with MooseFS; if  not,  write  to
       the  Free  Software  Foundation,  Inc.,  51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA or visit
       http://www.gnu.org/licenses/gpl-2.0.html

SEE ALSO

       mfschunkserver(8)