Please check the manual or man page.  from the man page: -storage -new -tlu Creates storage on an existing VTLU.        [-tapesize G]      Specifies the size of the virtual tapes in the file system. If no value      is defined, and -tape is not defined, then the default      value of 50 GB is used. If is defined but the tape size is      not, then the tape size is determined by the number of tapes and the      file system size.  You did not specify any tapesize, so the default tapesize is 50 GB, which does not fit into your 10 GB filesystem.  This is the reason for the error message
i have created 10G FS and trying to add storage on VTLUs getting below error.  $server_vtlu server_2 -storage -new rama1 -tlu 1 server_2 : Error 4427: server_2 : total tapes size is exceeding the available fs free space.  While i created VTLU with default settings.  $server_vtlu server_2 -tlu -new
Adding storage in VTLUs