IBM ( at least in the past ) has recommended Dual VIOS servers
and when talking to support they are amazed if you are not.
on Power7 say a 8282-E4D
6 drive Split Backplane $800 ( mirror VIOS drives ) Approx
$800 US List Pair of 5805 SAS Raid Controllers Approx $4,400
US List Total with disks, cables etc.Approx $5,200 US List
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