Raid 5 Write Speed Slowness

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http://www.linuxquestions.org – I have problems with severe write speed slowness after setting up a Raid 5 using mdadm. First, list of hardware: I have: - 4 x Barracuda 3TB drives (all connected to below) - Syba SATA II PCI-X 4 Port Host Raid Controller (not using it as a raid controller) - this card is suppose to provide 3GB/s transfer rate. - only required this card to support an additional 4 drives - 8GB DDR Ram - i5 Intel Processor Analysis i have done: Using hdparm showed on each drive: - Before Raid set up: Code: Timing cached reads:  12142 MB in  2.00 seconds = 6074.54 MB/sec  Ti (HowTos)