title: How much storage should a LucidWorks search engine index occupy?
body: <p>I'm trying to use LucidWorks (http://www.lucidimagination.com/products/lucidworks-search-platform) as a search engine for my organization intranet.
  I want it to index various document-types (Office formats, PDFs, web pages) from various data sources (web &amp; wiki, file system, Subversion repositories).
  So far I tried indexing several sites, directories &amp; repositories (about 500K documents, with total size of about 50GB) - and the size of the index is 155GB.</p>
  
  <p>Is this reasonable? Should the index occupy more storage than the data itself? What would be a reasonable thumb-rule for data-size to index-size ratio?</p>