A Simpana Client Fails to Perform a Backup

Multiple Choice

A Simpana client fails to perform a backup.  When you view the status of the task,  it reported the following error "library, media Agent, Drive pool, Media: mount path is offline: please check if the mount path is online and accessible ". What may can be the cause of this problem?

A) Client offline
B) Media Services Offline
C) The client cannot resolve the media server host name
D) backup media failure