VIO is not supported for storage. IBM is still working to improve the shared disk capability to use it with RAC. So currently if your customer wants RAC, he must attach all shared disks to store our database via direct attachments.
But VIO delivers networks features usable with RAC, for example if the customer is planning to use several LPARs as support of RAC instances a VLAN could be implemented for or RAC interconnect. A Virtual Ethernet could also be used for our VIP onfiguration. More.
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