NAME

       mfssnapshots - MooseFS snapshot tools

SYNOPSIS

       mfsappendchunks [-s FROM:TO] SNAPSHOT_FILE OBJECT...

       mfsmakesnapshot [-o|-c|-p] SOURCE... DESTINATION

       mfsrmsnapshot [-f] OBJECT...

DESCRIPTION

       mfsappendchunks  (equivalent  of  mfssnapshot  from  MooseFS  1.5)  appends a lazy copy of
       specified file(s) to specified snapshot file ("lazy" means that creation of new chunks  is
       delayed  to the moment one copy is modified). If multiple files are given, they are merged
       into one target file in such a way that each file begins at chunk (64MB) boundary; padding
       space  is  left  empty. Optionally only slice of chunks can be appended (option -s). Slice
       definition is similar to Python: FROM is included,  TO  excluded,  negative  numbers  mean
       backwards from the end. If FROM or TO is not specified then it means from the beginning or
       to the end of file respectively. See examples below.

       mfsmakesnapshot makes a "real" snapshot (lazy copy, like in case  of  mfsappendchunks)  of
       some  object(s)  or subtree (similarly to cp -r command). It's atomic with respect to each
       SOURCE argument separately.  If DESTINATION points to already existing file, error will be
       reported  unless  -o  (overwrite)  option  is given. Note: if SOURCE is a directory, it is
       copied as a whole; but if it's followed by  trailing  slash,  only  directory  content  is
       copied. When -c option is given then attributes of newly created files are more similar to
       those created by ordinary cp (without attribute preserving). Option -p preserves hardlinks
       in  SOURCE  (when  two  or more objects inside SOURCE are hardlinked to each other then in
       DESTINATION folder those objects will be hardlinked to each other as well).

       mfsrmsnapshot removes objects created as a result of mfsmakesnapshot (similarly to rm  -r,
       but much faster). For safety reasons objects created via mfsmakesnapshot have the snapshot
       attribute set (see mfseattr(1)) and only such objects can be removed  using  mfsrmsnapshot
       command.  By  default  all files and directories inside specified directory must have this
       attribute set for the command to remove the whole directory; otherwise  the  command  will
       not  remove  anything.  This  behavior  can  be  overridden by -f option. With this option
       mfsrmsnapshot will remove only those files/directories that have  snapshot  attribute  set
       and will leave everything else untouched.

SLICES

       FROM:TO for source file with chunks 0,1,2,...,N-1,N:

       2:4 = chunks 2 and 3

       3: = chunks 3,4,...,N

       :5 = chunks 0,1,2,3,4

       :-1 = chunks 0,1,2,3,...,N-1

       -4:-2 = chunks N-3,N-2

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

       mfsmount(8), mfstools(1), mfseattr(1)