NAME

       osdmaptool - ceph osd cluster map manipulation tool

SYNOPSIS

       osdmaptool mapfilename [--print] [--createsimple numosd
       [--pgbits bitsperosd ] ] [--clobber]

DESCRIPTION

       osdmaptool  is  a utility that lets you create, view, and manipulate OSD cluster maps from
       the Ceph distributed storage system. Notably, it lets you extract the embedded  CRUSH  map
       or import a new CRUSH map.

OPTIONS

       --print
              will  simply  make  the  tool  print  a  plaintext  dump  of  the  map,  after  any
              modifications are made.

       --clobber
              will allow osdmaptool to overwrite mapfilename if changes are made.

       --import-crush mapfile
              will load the CRUSH map from mapfile and embed it in the OSD map.

       --export-crush mapfile
              will extract the CRUSH map from the OSD map and write it to mapfile.

       --createsimple numosd [--pgbits bitsperosd]
              will create a relatively generic OSD map with the numosd devices.  If  --pgbits  is
              specified,  the initial placement group counts will be set with bitsperosd bits per
              OSD. That is, the pg_num map attribute will be set to numosd shifted by bitsperosd.

EXAMPLE

       To create a simple map with 16 devices:

          osdmaptool --createsimple 16 osdmap --clobber

       To view the result:

          osdmaptool --print osdmap

AVAILABILITY

       osdmaptool is part of the Ceph distributed storage  system.   Please  refer  to  the  Ceph
       documentation at http://ceph.com/docs for more information.

SEE ALSO

       ceph(8), crushtool(8),

COPYRIGHT

       2010-2014, Inktank Storage, Inc. and contributors. Licensed under Creative Commons BY-SA