raid - Slow writes Dell Server R720

I have a Dell R720 Server with PERC H310 hardware raid 5 and 4 x Seagate Cheetah 15K.7 ST3300657SS 300GB hard drives. Windows Server 2008 R2. The reads look good, but the writes are painfully slow.

Running the Atto Disk Benchmark, I'm seeing read speeds of >500 MB/sec at transfer sizes from 128kb to 8192kb.

For writes with transfer sizes from 128kb to 8192kb, I'm seeing read speeds of 20 to 22 MB/sec. About 10 times too slow.

The same machine has a new Samsung SSD. Writes for the SSD are > 450 MB/sec.

Besides checking the drivers, what might cause such bad performance? Where are good places to look? What good additional tests to run?

I was the only user during these tests. No resource hungry processes were running.

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