Amount of Disk I/O while searching

[sxam <sx...@yahoo.com>]

Hi,
We see non linear behavior while increasing index size of our Lucene index.
For 200GB, the simple search  of Query consisting of two strings and one
number  (Ford Focus 3) lasts 1.4 seconds. 
For 400GB , same search takes about 5 seconds.

The usual suspect is, of course, disk I/O. So, could someone please explain
me the number of Disk I/O operations performed while searching? And whether
this amount is linear relatively to index size?

The index is optimized and includes lots of strings and numbers in one
indexed Field (the indexed entity is web pages).

Thanks!

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