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Langue: en

Version: 364708 (ubuntu - 25/10/10)

Section: 8 (Commandes administrateur)


osdmaptool - ceph osd cluster map manipulation tool


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


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.


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


To create a simple map with 16 devices:
osdmaptool --createsimple 16 osdmap --clobber

To view the result:

osdmaptool --print osdmap


osdmaptool is part of the Ceph distributed file system. Please refer to the Ceph wiki at for more information.


ceph(8), crushtool(8), mkcephfs(8)
Rien ni personne n'a tout à fait tort :
même une horloge arrêtée a raison deux fois par jour.
-+- John Steinbeck -+-