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158 lines
4.5 KiB
ReStructuredText
158 lines
4.5 KiB
ReStructuredText
:orphan:
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======================================================
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osdmaptool -- ceph osd cluster map manipulation tool
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======================================================
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.. program:: osdmaptool
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Synopsis
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========
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| **osdmaptool** *mapfilename* [--print] [--createsimple *numosd*
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[--pgbits *bitsperosd* ] ] [--clobber]
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Description
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===========
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**osdmaptool** is a utility that lets you create, view, and manipulate
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OSD cluster maps from the Ceph distributed storage system. Notably, it
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lets you extract the embedded CRUSH map or import a new CRUSH map.
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Options
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=======
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.. option:: --print
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will simply make the tool print a plaintext dump of the map, after
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any modifications are made.
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.. option:: --clobber
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will allow osdmaptool to overwrite mapfilename if changes are made.
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.. option:: --import-crush mapfile
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will load the CRUSH map from mapfile and embed it in the OSD map.
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.. option:: --export-crush mapfile
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will extract the CRUSH map from the OSD map and write it to
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mapfile.
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.. option:: --createsimple numosd [--pgbits bitsperosd]
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will create a relatively generic OSD map with the numosd devices.
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If --pgbits is specified, the initial placement group counts will
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be set with bitsperosd bits per OSD. That is, the pg_num map
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attribute will be set to numosd shifted by bitsperosd.
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.. option:: --test-map-pgs [--pool poolid]
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will print out the mappings from placement groups to OSDs.
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.. option:: --test-map-pgs-dump [--pool poolid]
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will print out the summary of all placement groups and the mappings
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from them to the mapped OSDs.
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Example
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=======
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To create a simple map with 16 devices::
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osdmaptool --createsimple 16 osdmap --clobber
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To view the result::
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osdmaptool --print osdmap
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To view the mappings of placement groups for pool 0::
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osdmaptool --test-map-pgs-dump rbd --pool 0
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pool 0 pg_num 8
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0.0 [0,2,1] 0
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0.1 [2,0,1] 2
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0.2 [0,1,2] 0
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0.3 [2,0,1] 2
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0.4 [0,2,1] 0
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0.5 [0,2,1] 0
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0.6 [0,1,2] 0
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0.7 [1,0,2] 1
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#osd count first primary c wt wt
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osd.0 8 5 5 1 1
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osd.1 8 1 1 1 1
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osd.2 8 2 2 1 1
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in 3
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avg 8 stddev 0 (0x) (expected 2.3094 0.288675x))
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min osd.0 8
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max osd.0 8
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size 0 0
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size 1 0
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size 2 0
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size 3 8
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In which,
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#. pool 0 has 8 placement groups. And two tables follow:
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#. A table for placement groups. Each row presents a placement group. With columns of:
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* placement group id,
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* acting set, and
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* primary OSD.
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#. A table for all OSDs. Each row presents an OSD. With columns of:
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* count of placement groups being mapped to this OSD,
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* count of placement groups where this OSD is the first one in their acting sets,
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* count of placement groups where this OSD is the primary of them,
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* the CRUSH weight of this OSD, and
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* the weight of this OSD.
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#. Looking at the number of placement groups held by 3 OSDs. We have
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* avarge, stddev, stddev/average, expected stddev, expected stddev / average
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* min and max
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#. The number of placement groups mapping to n OSDs. In this case, all 8 placement
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groups are mapping to 3 different OSDs.
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In a less-balanced cluster, we could have following output for the statistics of
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placement group distribution, whose standard deviation is 1.41421::
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#osd count first primary c wt wt
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osd.0 8 5 5 1 1
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osd.1 8 1 1 1 1
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osd.2 8 2 2 1 1
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#osd count first primary c wt wt
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osd.0 33 9 9 0.0145874 1
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osd.1 34 14 14 0.0145874 1
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osd.2 31 7 7 0.0145874 1
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osd.3 31 13 13 0.0145874 1
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osd.4 30 14 14 0.0145874 1
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osd.5 33 7 7 0.0145874 1
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in 6
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avg 32 stddev 1.41421 (0.0441942x) (expected 5.16398 0.161374x))
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min osd.4 30
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max osd.1 34
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size 00
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size 10
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size 20
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size 364
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Availability
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============
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**osdmaptool** is part of Ceph, a massively scalable, open-source, distributed storage system. Please
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refer to the Ceph documentation at http://ceph.com/docs for more
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information.
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See also
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========
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:doc:`ceph <ceph>`\(8),
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:doc:`crushtool <crushtool>`\(8),
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