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$ osdmaptool --createsimple 3 myosdmap --with-default-pool
osdmaptool: osdmap file 'myosdmap'
osdmaptool: writing epoch 1 to myosdmap
$ osdmaptool --export-crush oc myosdmap
osdmaptool: osdmap file 'myosdmap'
osdmaptool: exported crush map to oc
$ crushtool --decompile oc
# begin crush map
tunable choose_local_tries 0
tunable choose_local_fallback_tries 0
tunable choose_total_tries 50
tunable chooseleaf_descend_once 1
tunable chooseleaf_vary_r 1
tunable chooseleaf_stable 1
tunable straw_calc_version 1
tunable allowed_bucket_algs 54
# devices
device 0 osd.0
device 1 osd.1
device 2 osd.2
# types
type 0 osd
type 1 host
type 2 chassis
type 3 rack
type 4 row
type 5 pdu
type 6 pod
type 7 room
type 8 datacenter
type 9 zone
type 10 region
type 11 root
# buckets
host localhost {
\tid -2\t\t# do not change unnecessarily (esc)
\t# weight 3.00000 (esc)
\talg straw2 (esc)
\thash 0\t# rjenkins1 (esc)
\titem osd.0 weight 1.00000 (esc)
\titem osd.1 weight 1.00000 (esc)
\titem osd.2 weight 1.00000 (esc)
}
rack localrack {
\tid -3\t\t# do not change unnecessarily (esc)
\t# weight 3.00000 (esc)
\talg straw2 (esc)
\thash 0\t# rjenkins1 (esc)
\titem localhost weight 3.00000 (esc)
}
root default {
\tid -1\t\t# do not change unnecessarily (esc)
\t# weight 3.00000 (esc)
\talg straw2 (esc)
\thash 0\t# rjenkins1 (esc)
\titem localrack weight 3.00000 (esc)
}
# rules
rule replicated_rule {
\tid 0 (esc)
\ttype replicated (esc)
\tstep take default (esc)
\tstep chooseleaf firstn 0 type host (esc)
\tstep emit (esc)
}
# end crush map
$ osdmaptool --print myosdmap
osdmaptool: osdmap file 'myosdmap'
epoch 1
fsid [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (re)
created \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+.\d\d\d\d (re)
modified \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+.\d\d\d\d (re)
flags
crush_version 1
full_ratio 0
backfillfull_ratio 0
nearfull_ratio 0
min_compat_client jewel
stretch_mode_enabled false
pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
max_osd 3
$ osdmaptool --clobber --createsimple 3 --with-default-pool myosdmap
osdmaptool: osdmap file 'myosdmap'
osdmaptool: writing epoch 1 to myosdmap
$ osdmaptool --print myosdmap | grep 'pool 1'
osdmaptool: osdmap file 'myosdmap'
pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
$ rm -f myosdmap
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