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Read http://hwraid.le-vert.net/wiki/LSIMegaRAIDSAS about write-back.
@mustafaramadhan i know that but I/O not changed when cached. I installed CentOS 7 with XFS file system. It have effect to performance?
300MB/s is about the average for 4 HDD's in a low/mid end RAID 10 + BBU array, I always get the same-ish results for this kind of setup.
Do keep in mind that CPU and RAM has some influences on IO as well.
@PetaByet Server run Dual X5650 + 32GB ECC RAM. im not sure them has some influences on IO.
cache size? is cache allocated to read or write? maybe try changing the %
what SATA HDD ? they may be the limiting factor
Cache 512MB, the drive http://www.newegg.com/Product/Product.aspx?Item=9SIA5AD1P08389
Detail MegaRAID http://pastebin.com/dCf8mwGa
Seem issues from there