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) 2021 Jakub Kruszona-Zawadzki, Core Technology Sp. z o.o.

       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)