osdmaptool man page

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),

Referenced By

crushtool(8).

Oct 26, 2016 dev Ceph