Filesystem question

Hi all, We have SUSE 9.0 AMD64 with 2 Opteron 2GHz CPU. Our application has so many I/O disk operations and should work with filesize up to 10-15GB. For this moment, we use ReiserFS but we cant know if this is optimized filesystem or not. Anyone has some experiences about this ? Thank you in advance, Regards -- Quy NGUYEN DAI GDTech SA