Redundancy mechanism of a disk enclosure's power modules

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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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Redundancy of OceanStor T Series S5600T, S5800T, and S6800T V100R005
The following lists the redundancy of main components of OceanStor T Series S5600T, S5800T, and S6800T V100R005: Controller (dual-controller): 1 + 1 Expansion module: 1 + 1 Power module: 2 x (1 + 1) BBU module: 2 x (1 + 1) Fan module: 5 + 1

V3 disk enclosure
V3 disk enclosures are described as follows: A disk enclosure adopts a modular design and consists of a system enclosure, expansion modules, power modules, and disk modules.

Share of V3 series' disk interface modules
V3 and T series disk enclosures cannot share disk interface modules.

Precautions for cascading disk enclosures
Note the following when cascading disk enclosures: 1. Ensure that the model of the disk enclosure to be added is the same as that of the existing disk enclosure. 2. After disks are inserted and the disk enclosure is turned on, the disk enclosure is automatically powered on and started up. 3. After the disk enclosure is powered on, use cascading cables to connect the disk enclosure to the controller enclosure. The storage system can then automatically identify the new disk enclosure. You do not need to suspend services when cascading disk enclosures. However, if disk enclosures are cascaded when services are running, a SAS/Fibre Channel loop or flapping may occur, adversely affecting the services. For this reason, to protect customer services and data security, suspend services and add disk enclosures during off-peak hours.

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