Why do the two expansion port indictors on the controller enclosure light up asynchronously?

1

Both expansion ports are powered by different power supplies; one is by the secondary power supply, and the other by the primary power supply.
During the system power-up, the secondary power supply powers up and then the primary power supply. Therefore, one indicator lights up and then the other.
During the system reset, the primary power supply is reset but not the secondary power supply. Therefore, one indicator is green on and the other is off.

Other related questions:
5500 V3 expansion disk enclosure specifications
V3 series unified storage 5500 V3 V300R001 supports a maximum of 31 expansion disk enclosures and 24 high-density disk enclosures due to limited cascading cable length. Specifications vary with product versions. For the latest specifications, see Product Specifications.

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