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In integrated 2 U enclosures (for the OceanStor 5300/5500/5300F/5500F V5 and 5500 V5 Elite), IOM1 is used for IP scale-out.
In separated 3 U (for the OceanStor 5600/5600F/5800/5800F V5) and 6 U (for the OceanStor 6800/6800F V5) enclosures, IOM3 is used for IP scale-out.
IP scale-out is performed through SmartIO cards. These slots can also be used for host interface cards or back-end interface cards.
Hope can help you!