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OSDMAPTOOL(8)			     Ceph			 OSDMAPTOOL(8)

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 file 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 map‐
	      file.

       --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  bitsper‐
	      osd.

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 file system.  Please refer
       to the Ceph wiki at http://ceph.newdream.net/wiki for more information.

SEE ALSO
       ceph(8), crushtool(8), mkcephfs(8)

COPYRIGHT
       2011, New Dream Network

dev			      September 22, 2011		 OSDMAPTOOL(8)

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