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Unexpectively slow data loading into Oracle

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Big amount (4.000.000+) of files (1-4Mb each) are loading into Oracle 10g for about several days.
Table is allocated in big tablespace, which was created on special volume (labeled BIG_VOL) over hardware RAID (Adaptec 3805 , 8 HDD x 2Tb, raid level 6).

RedoLogs was moved on two another SSD drives. No archivelog.
There are only DBF and control files on BIG_VOL.

Transaction closed (by COMMIT) after every loaded file.

Perfomance Monitor shows ~6-9Mb per second on writing for this BIG_VOL !
Simple copy any big file shows about 80+Mb per second!

Can I do something to improve speed?


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