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# TODO be user-friendly
$ osdmaptool --help
usage: [--print] <mapfilename>
--create-from-conf creates an osd map with default configurations
--createsimple <numosd> [--clobber] [--pg-bits <bitsperosd>] [--pgp-bits <bits>] creates a relatively generic OSD map with <numosd> devices
--pgp-bits <bits> pgp_num map attribute will be shifted by <bits>
--pg-bits <bits> pg_num map attribute will be shifted by <bits>
--clobber allows osdmaptool to overwrite <mapfilename> if it already exists
--export-crush <file> write osdmap's crush map to <file>
--import-crush <file> replace osdmap's crush map with <file>
--health dump health checks
--test-map-pgs [--pool <poolid>] [--pg_num <pg_num>] [--range-first <first> --range-last <last>] map all pgs
--test-map-pgs-dump [--pool <poolid>] [--range-first <first> --range-last <last>] map all pgs
--test-map-pgs-dump-all [--pool <poolid>] [--range-first <first> --range-last <last>] map all pgs to osds
--mark-up-in mark osds up and in (but do not persist)
--mark-out <osdid> mark an osd as out (but do not persist)
--mark-up <osdid> mark an osd as up (but do not persist)
--mark-in <osdid> mark an osd as in (but do not persist)
--with-default-pool include default pool when creating map
--clear-temp clear pg_temp and primary_temp
--clean-temps clean pg_temps
--test-random do random placements
--test-map-pg <pgid> map a pgid to osds
--test-map-object <objectname> [--pool <poolid>] map an object to osds
--upmap-cleanup <file> clean up pg_upmap[_items] entries, writing
commands to <file> [default: - for stdout]
--upmap <file> calculate pg upmap entries to balance pg layout
writing commands to <file> [default: - for stdout]
--upmap-max <max-count> set max upmap entries to calculate [default: 10]
--upmap-deviation <max-deviation>
max deviation from target [default: 5]
--upmap-pool <poolname> restrict upmap balancing to 1 or more pools
--upmap-active Act like an active balancer, keep applying changes until balanced
--dump <format> displays the map in plain text when <format> is 'plain', 'json' if specified format is not supported
--tree displays a tree of the map
--test-crush [--range-first <first> --range-last <last>] map pgs to acting osds
--adjust-crush-weight <osdid:weight>[,<osdid:weight>,<...>] change <osdid> CRUSH <weight> (but do not persist)
--save write modified osdmap with upmap or crush-adjust changes
--read <file> calculate pg upmap entries to balance pg primaries
--read-pool <poolname> specify which pool the read balancer should adjust
--vstart prefix upmap and read output with './bin/'
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