It means what it says. There are two modules from the same stack connected to the same PCI card. Moving one of them to a different PCI card will resolve the issue in configu advisor, if another card is available in the configuration. That platform has two onboard SAS ports, and you have a card in slot4. With no additional cards you can do 2 stacks while observing the splt-asic and split-pci card rules.
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