text: The maximum file size that can be processed is a function of the heap size. When you set the 
  maximum heap size to a value greater than 2 GB, the file size limits for text, XML, and binary 
  documents must be increased for new collections. For each 8.3 MB of heap memory over 
  2 GB, the values of the file size limits (60 MB by default) must be increased by 1 MB (up to 
  400 MB), as demonstrated by the following formula: 
  
  Max file size = 60 MB + (heap memory - 2 GB) / 8.3 
  
  For example, a 2 GB maximum heap size results in 60 MB as the maximum size of a file that 
  can be processed. 
  
  **15.3.6 Index considerations**
  
  The most significant sizing option for the FTS Server system is the hard disk requirements for 
  the full text index. The FTS Server requires a fast disk subsystem. Because the textual 
  representation of each indexed document is stored in the disk subsystem, a considerable 
  amount of disk space might be needed. 
  
  **Index size calculation**
  Although the disk space usage depends on the text in each document, this usage is linear to 
  the original size of the indexed data. Typically, the size of the index on the disk is 50% - 150% 
  of the original text size as illustrated in the following formulas: 
  
  minimum disk space = Number of documents x document size x 50% 