Storing millions of small files

[Brendan cheng]

Hi,
I read HDFS architecture doc and it said HDFS is tuned for at storing large 
file, typically gigabyte to terabytes.What is the downsize of storing million 
of small files like <10MB?  or what setting of HDFS is suitable for storing 
small files?
Actually, I plan to find a distribute filed system for storing mult million of 
files.
Brendan