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$ map="$TESTDIR/build.crushmap"
#
# display the crush tree by default
#
$ crushtool --outfn "$map" --build --num_osds 5 node straw 2 rack straw 1 root straw 0
#
# silence all messages with --debug-crush 0
#
$ CEPH_ARGS="--debug-crush 0" crushtool --outfn "$map" --build --num_osds 5 node straw 2 rack straw 1 root straw 0
#
# display a warning if there is more than one root
#
$ crushtool --outfn "$map" --build --num_osds 5 node straw 2 rack straw 1
The crush rules will use the root rack0 (re)
and ignore the others.
There are 3 roots, they can be
grouped into a single root by appending something like:
root straw 0
#
# crush rules are generated using the OSDMap helpers
#
$ CEPH_ARGS="--debug-crush 0" crushtool --outfn "$map" --set-straw-calc-version 0 --build --num_osds 1 root straw 0 --set-chooseleaf-stable 0
$ crushtool -o "$map.txt" -d "$map"
$ cat "$map.txt"
# 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 allowed_bucket_algs 54
# devices
device 0 osd.0
# types
type 0 osd
type 1 root
# buckets
root root {
\tid -1\t\t# do not change unnecessarily (esc)
\t# weight 1.00000 (esc)
\talg straw (esc)
\thash 0\t# rjenkins1 (esc)
\titem osd.0 weight 1.00000 (esc)
}
# rules
rule replicated_rule {
\tid 0 (esc)
\ttype replicated (esc)
\tstep take root (esc)
\tstep chooseleaf firstn 0 type root (esc)
\tstep emit (esc)
}
# end crush map
$ rm "$map" "$map.txt"
#
# Wrong number of arguments
#
$ crushtool --outfn "$map" --debug-crush 0 --build --num_osds 5 node straw 0
remaining args: [--debug-crush,0,node,straw,0]
layers must be specified with 3-tuples of (name, buckettype, size)
[1]
# Local Variables:
# compile-command: "cd ../../.. ; make crushtool && test/run-cli-tests"
# End:
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