text: A user can log in with their short name (that is, without the domain component) or with the 
  fully qualified user name in the form of an email address. 
  
  **4.4.4 User groups and roles**
  
  User groups are used to determine what tasks the user is authorized to perform. Each user 
  group is associated with a single*role*. The role for a user group cannot be changed, but user 
  groups (with one of the defined roles) can be created. 
  
  The rights of a user who belongs to a specific user group are defined by the role that is 
  assigned to the user group. It is the role that defines what a user can or cannot do on the 
  system. 
  
  Storwize V7000 provides six user groups and seven roles by default, as listed in Table 4-1. 
  The VasaProvider role is not associated with a default user group. 
  
  **Note:**The VasaProvider role is used to allow VMware to interact with the system when 
  implementing Virtual Volumes. Avoid using this role for users who are not controlled by 
  VMware. 