suggest you enable auditing on the control station. just configure a few scripts and enable the audit services, and track the logon event. you will get the log like this.  [IMAGE]  check the configuration details from this: [URL]
Hi  Each of the relevant staff have their own username (global user) to access Unisphere. Is there any way that I can monitor who and when people are logging into our Clarion and Celerra using Unisphere?   Thanks
Unisphere – auditing user logon