查看msd状态
[cephadm@ceph-admin ceph-cluster]$ ceph mds statcephfs-1/1/1 up {0=ceph-mon02=up:active}, 2 up:standby[cephadm@ceph-admin ceph-cluster]$ ceph fs status cephfscephfs - 0 clients======+------+--------+------------+---------------+-------+-------+| Rank | State | MDS | Activity | dns | inos |+------+--------+------------+---------------+-------+-------+| 0 | active | ceph-mon02 | Reqs: 0 /s | 18 | 17 |+------+--------+------------+---------------+-------+-------++---------------------+----------+-------+-------+| Pool | type | used | avail |+---------------------+----------+-------+-------+| cephfs-metadatapool | metadata | 59.8k | 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]$提示：可以看到现在有两个mds处于standby状态，一个active状态mds；
管理rank
增加Active MDS的数量命令格式：ceph fs set <fsname> max_mds <number>
[cephadm@ceph-admin ceph-cluster]$ ceph fs set cephfs max_mds 2[cephadm@ceph-admin ceph-cluster]$ ceph fs status cephfscephfs - 0 clients======+------+--------+------------+---------------+-------+-------+| Rank | State | MDS | Activity | dns | inos |+------+--------+------------+---------------+-------+-------+| 0 | active | ceph-mon02 | Reqs: 0 /s | 18 | 17 || 1 | active | ceph-mon01 | Reqs: 0 /s | 10 | 13 |+------+--------+------------+---------------+-------+-------++---------------------+----------+-------+-------+| Pool | type | used | avail |+---------------------+----------+-------+-------+| cephfs-metadatapool | metadata | 61.1k | 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]$提示：仅当存在某个备用守护进程可供新rank使用时，文件系统中的实际rank数才会增加；多活MDS的场景依然要求存在备用的冗余主机以实现服务HA，因此max_mds的值总是应该比实际可用的MDS数量至少小1；
降低Acitve MDS的数量
减小max_mds的值仅会限制新的rank的创建，对于已经存在的Active MDS及持有的rank不造成真正的影响，因此降低max_mds的值后，管理员需要手动关闭不再不再被需要的rank；命令格式：ceph mds deactivate {System:rank|FSID:rank|rank}
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