On 16/12/2013 14:07, lilofile wrote:

when I Create a raid5,dd  1M block size,the performance can reached to 1GB/s
when I create another raid5,dd 1M block size ,the performance can reached to 1GB/s
when I simultaneously dd the two different raid,the total performance only reached to 1.4GB/s,why can not reached to 2GB/s.

the memory is 32GB,CPU is x5660,the stripe size is 4096
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What is the disks involved in the array ? How are they connected ?