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