RAID 1 with 2 HD`s or RAID 5 or RAID 10 with 4 HD`s for better performance??

Now on my server I have RAID 1 with 2x 250GB SATA 2 HD`s but I have problem, load is too high for only one MySQL DB on server!!!
That MySQL DB I moved from P4 2.8GHz (HT disabled) with 1GB RAM with IDE HD without RAID (load 0.1 average) to this AMD Opteron 170 with 2GB RAM and with 2x 250GB HD`s SATA 2 in RAID1 (3ware 9500S-8) now I have load 0.4-0.5 with cache enabled on RAID card (but that can be problem) and over 0.8 with cache disabled!!! Too bad perfomance, better on old P4, much better!

Why?? RAID 1 generate that load? (only that MySQL DB I have on that server)

How I can fix this? RAID 5 or RAID 10 can help? RAID 10 with 4 HD`s can much help?

Thanks.

 

 

 

 

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