[cephadm@ceph-admin ceph-cluster]$ ceph fs set cephfs max_mds 1[cephadm@ceph-admin ceph-cluster]$ ceph fs statuscephfs - 0 clients======+------+----------+------------+---------------+-------+-------+| Rank | State | MDS | Activity | dns | inos |+------+----------+------------+---------------+-------+-------+| 0 | active | ceph-mon02 | Reqs: 0 /s | 18 | 17 || 1 | stopping | ceph-mon01 | | 10 | 13 |+------+----------+------------+---------------+-------+-------++---------------------+----------+-------+-------+| Pool | type | used | avail |+---------------------+----------+-------+-------+| cephfs-metadatapool | metadata | 61.6k | 280G || cephfs-datapool | data | 3391k | 280G |+---------------------+----------+-------+-------++-------------+| Standby MDS |+-------------+| ceph-mon03 |+-------------+MDS version: ceph version 13.2.10 (564bdc4ae87418a232fc901524470e1a0f76d641) mimic (stable)[cephadm@ceph-admin ceph-cluster]$ ceph mds deactivate cephfs:1Error ENOTSUP: command is obsolete; please check usage and/or man page[cephadm@ceph-admin ceph-cluster]$ ceph fs statuscephfs - 0 clients======+------+--------+------------+---------------+-------+-------+| Rank | State | MDS | Activity | dns | inos |+------+--------+------------+---------------+-------+-------+| 0 | active | ceph-mon02 | Reqs: 0 /s | 18 | 17 |+------+--------+------------+---------------+-------+-------++---------------------+----------+-------+-------+| Pool | type | used | avail |+---------------------+----------+-------+-------+| cephfs-metadatapool | metadata | 62.1k | 280G || cephfs-datapool | data | 3391k | 280G |+---------------------+----------+-------+-------++-------------+| Standby MDS |+-------------+| ceph-mon03 || ceph-mon01 |+-------------+MDS version: ceph version 13.2.10 (564bdc4ae87418a232fc901524470e1a0f76d641) mimic (stable)[cephadm@ceph-admin ceph-cluster]$提示：虽然我们执行ceph deactivate 命令对应提示我们命令过时，但对应mds还是被还原了；
手动分配目录子树至rank
多Active MDS的CephFS集群上会运行一个均衡器用于调度元数据负载，这种模式通常足以满足大多数用户的需求；个别场景中，用户需要使用元数据到特定级别的显式映射来覆盖动态平衡器，以在整个集群上自定义分配应用负载；针对此目的提供的机制称为“导出关联”，它是目录的扩展属性ceph.dir.pin；目录属性设置命令：setfattr -n ceph.dir.pin -v RANK /PATH/TO/DIR；扩展属性的值 ( -v ) 是要将目录子树指定到的rank 默认为-1，表示不关联该目录；目录导出关联继承自设置了导出关联的最近的父级，因此，对某个目录设置导出关联会影响该目录的所有子级目录；
经验总结扩展阅读
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