MD3000 Performance

[Mahmoud Hanafi]

We just installed a MD3000 & MD1000. We ran some simple performance test 
using XDD and iozone. We tested various raid group at the device and file 
system level. We are seen some very poor performance.

Single Disk Raid0 sequential Writes= 20MB/sec

4+1 and 7+1 Disks Raid5 Sequential writes = 100MB/sec 

Is this performance typical? Any tuning suggestions?

Regards,
Mahmoud Hanafi