Environment：
3 Con + 30 Com（4.0.1） + 9 ceph
Precondition：
Zabbix agent enabled in node-30,node-31,node-32
Controllers' memory usage are monitored
Steps：
- Do common operation for 10 days or more
- Login Zabbix server to observer memory usage of contoller nodes
Expectation：
During long run,controllers' free memory > 20%
Actuality：
During long run,controllers' free memory may be less than 1G
Horizon can't login,Authentication failed easily
Probability：
10/10
Preliminary Analysis:
...
