data size limitation?

[zzzzz shalev]

hey,
   
  is there a max amount of data (in gigabytes) where lucene's performance 
starts to deteriorate
   
  i tested with about 2 giga on two instances (2 ram dirs using the 
parallelmultisearcher) and performance was great,
   
  however i think i will need to support about 10-15 times as much data 
(approx. 20-30 giga) will lucene hold up?
   
  thanks in advance,

                
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