1. 从任意一个monitor节点提取crush map并反编译它
# ceph osd getcrushmap -o crushmap-extract
# crushtool -d crushmap-extract -o crushmap-decompiled
2. 编辑器编辑默认的crush map文件
# vi crushmap-decompiled
3. 编译crush文件注入回cephalexin集群
# crushtool -c crushmap-decompiled -o crushmap-compiled
# ceph osd setcrushmap -i crushmap-compiled
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