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SATA and SATARAID
Mark,
A brief answer ( or two comments ). First, as you may know HDD's have only a 16 bit data bus. PCI allows for 32bits. Since we all use LBA addressing we all know that LBA evolved into a 28 bit address. Well 28+16=44 *TILT* it is only a 40 pin connector. Well it can up two loads to the drive to get to the CHS where the data is stored. Contrast that with data coming out serially and addresses and data going in serially. Information between the SATA controller and the drive is moving at 150mb/s and they have two shielded twisted pair so you can read and write at the same time. The bad news is that PCI bus is 4 bytes wide and runs at 33 MHz. I computer term that a band width of 4*33=132 mB/s. It is not very likely would get 100% of the attention of the PCI bus and the south bridge. The 2 WD Raptors I have in RAID 0 do 94 mob/so on a sequential read. They use a Highpoint 1540. Second point. It looks like we will be living with the connect-the-dots speed programs for a while. HD Tach and Sandra have timing problems a these speeds. DiskSpeed 32 really is not flexible enough for RAID work. PCMark2002 will give you great numbers but even it will report 345mB/s speeds. Say Hi to Marge JPS .. .. |
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