RAID read performance

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Hi,

According to RAID theory, the READ performance with RAID0, 1 and 5
should
Be faster than one with non-RAID. I tested it on Redhat linux(ES) on
Pentium PC, but they are almost same. I am using
RocketRAID404(HPT374)PCI card to connect 4 master IDE
Drivers.
Ideally it must be 2 or more times faster on RAID0/1/5.

Do we still have an issue on parallelism on 2.4 and 2.6 Linux kernel?

Thanks,

Bo

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