I did a write IO test in IBM P690 and HP SUPERDOME.
When I tested the local disks in P690,use this:
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time dd if=/dev/zero of=/tmp/test.dat bs=1024 count=300000
300000+0 records in
300000+0 records out
real 0m42.01s
user 0m0.85s
sys 0m6.18s
The Speed should be 7MB/s almost,and the P690 is running none except
this.

When I tested the local disks in the SUPERDOME,
---------------------------------------------
time dd if=/dev/zero of=/tmp/test.dat bs=1024 count=300000
300000+0 records in
300000+0 records out

real 2.9
user 0.2
sys 2.5
The Speed should be 100MB/s almost!!!!
=======================================
I used the same method to test the Storage of HDS 9980,which is
connected to the P690 and SUPERDOME.
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the result of P690 is 56MB/s almost,and result of SUPERDOME is 90MB/s
almost !!!

I'll cry for explaining this to the customer.
Anyone can help me to explain this?