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 Ceph, a massively scalable, open-source, 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  Attribution  Share
       Alike 3.0 (CC-BY-SA-3.0)

dev                                            September 09, 2020                                  OSDMAPTOOL(8)