Hi, Before IBM VIOS was certified by Oracle RAC last year, I always use two HBA ports and two NIC card ports on each node for redundancy purpose in the RAC implementation in IBM p series servers. I would like to hear other expert's opinion whether VIOS should be considered in the Oracle RAC. Here are the pros and cons that I could think of for whether or not using VIOS in RAC: Use dedicated HBA and NIC: pros: the storage I/O and network throughput are guaranteed and predictable. cons: additional cost, the LPAR can not be dynamically moved to another frame if needed (since HBA and NIC are attached to the LPAR) Use VIOS: pros: I/O Virtualization. cons: the LPAR can be dynamically moved to anther frame if needed. RAC node I/O may be impacted by other LPARs that use same device. You comments or suggestions are highly appreciated. Thanks, -- Regards, Limin Guo.