public void createSnapshot() throws BackupException {
  logger.debug("Creating snapshot: " + this.snapshotName);
  processHelper.exec("Creating file system snapshot",lvcreateCmd);
}

public void createSnapshot ( ) throws BackupException { logger . debug ( "Creating snapshot: " + this . snapshotName ) ; processHelper . exec ( "Creating file system snapshot" , lvcreateCmd ) ; }
creates a new snapshot , which is assumed not to exist already .
