2.12. 减少活跃元数据服务器守护进程数量

流程

1. 设置由 max_mds 参数指定的相同 MDS 守护进程数：

   语法

   ceph fs status NAME

   Copy to Clipboard Toggle word wrap

   示例

   [root@mon ~]# ceph fs status cephfs
   cephfs - 0 clients
   
   +------+--------+-------+---------------+-------+-------+--------+--------+
   | RANK | STATE  |  MDS  |    ACTIVITY   |  DNS  |  INOS |  DIRS  |  CAPS  |
   +------+--------+-------+---------------+-------+-------+--------+--------+
   |  0   | active | node1 | Reqs:    0 /s |   10  |   12  |   12   |   0    |
   |  1   | active | node2 | Reqs:    0 /s |   10  |   12  |   12   |   0    |
   +------+--------+-------+---------------+-------+-------+--------+--------+
   +-----------------+----------+-------+-------+
   |       POOL      |   TYPE   |  USED | AVAIL |
   +-----------------+----------+-------+-------+
   | cephfs_metadata | metadata | 4638  | 26.7G |
   |   cephfs_data   |   data   |    0  | 26.7G |
   +-----------------+----------+-------+-------+
   
   +-------------+
   | Standby MDS |
   +-------------+
   |    node3    |
   +-------------+

   Copy to Clipboard Toggle word wrap

2. 在具有管理功能的节点中，将 max_mds 参数改为所需的活跃 MDS 守护进程数：

   语法

   ceph fs set NAME max_mds NUMBER

   Copy to Clipboard Toggle word wrap

   示例

   [root@mon ~]# ceph fs set cephfs max_mds 1

   Copy to Clipboard Toggle word wrap

3. 通过观察 Ceph 文件系统状态，等待存储集群稳定到新的 max_mds 值。

4. 验证活跃 MDS 守护进程的数量：

   语法

   ceph fs status NAME

   Copy to Clipboard Toggle word wrap

   示例

   [root@mon ~]# ceph fs status cephfs
   cephfs - 0 clients
   
   +------+--------+-------+---------------+-------+-------+--------+--------+
   | RANK | STATE  |  MDS  |    ACTIVITY   |  DNS  |  INOS |  DIRS  |  CAPS  |
   +------+--------+-------+---------------+-------+-------+--------+--------+
   |  0   | active | node1 | Reqs:    0 /s |   10  |   12  |   12   |   0    |
   +------+--------+-------+---------------+-------+-------+--------|--------+
   +-----------------+----------+-------+-------+
   |       POOl      |   TYPE   |  USED | AVAIL |
   +-----------------+----------+-------+-------+
   | cephfs_metadata | metadata | 4638  | 26.7G |
   |   cephfs_data   |   data   |    0  | 26.7G |
   +-----------------+----------+-------+-------+
   
   +-------------+
   | Standby MDS |
   +-------------+
   |    node3    |
   |    node2    |
   +-------------+

   Copy to Clipboard Toggle word wrap