Redundancy mechanism of a disk enclosure's power modules

2 U and 4 U disk enclosures have different power module configurations.
2 U disk enclosure: Configure two power modules for 1+1 redundancy. The failure of either power module does not affect the proper running of the disk enclosure.
4 U disk enclosure: Configure four power modules for 2+2 redundancy. The failure of any two power modules does not affect the proper running of the disk enclosure.

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