Also, I am observing the following error in heartbeat console:
The passive server attempted to access the file: C:\Program Files\Microsoft SQL Server\MSSQL10_50.VIM_SQLEXP\MSSQL\DATA\MSDBLog.ldf. This failed because the file was in use by another application. Please ensure that there are no applications which access protected files running on the passive. Please see vCSHB Ref: 991.