RAID performance

# cat runbonnie.sh
#!/bin/bash
ram=`free -m | grep 'Mem:' | awk '{print $2}'`
size=$(($ram*2))
echo "ram=$ram size=$size"
dir=$1
bonnie++ -n 0 -u 0 -r $ram -s $size -f -b -d $dir


## 3ware 9750-8i, RAID 6, five Hitachi HDS722020ALA330 2TB drives
## ext4 filesystem in an LVM volume group, in a software-encrypted LVM physical volume
# ./runbonnie.sh /home/eric/foo
ram=15698 size=31396
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
ruckus2.brou 31396M           124714  27 61133  19           148203  17 308.2  17
Latency                        9402ms   10118ms               196ms     522ms

1.96,1.96,ruckus2.brouhaha.com,1,1302892750,31396M,,,,124714,27,61133,19,,,148203,17,308.2,17,,,,,,,,,,,,,,,,,,,9402ms,10118ms,,196ms,522ms,,,,,,