A faulty storage hardware module needs to be replaced. Which of the following components can be replaced online?

In Huawei flash storage systems like the OceanStor Dorado series, components are designed for high availability, which includes the ability to perform online (hot-swappable) replacement of failed parts. Battery Backup Units (BBUs), Disks (SSDs), and Interface Modules (such as Fibre Channel or Ethernet cards) are all designed as hot-swappable Field Replaceable Units (FRUs). This allows an administrator to replace a faulty component while the storage system remains online and serving I/O, thus preventing service downtime.

A: The controller enclosure backplane is the central interconnecting circuit board for all major components within the enclosure, including controllers, power supplies, and disks. Replacing it is a major invasive procedure that requires the entire enclosure to be powered down and disassembled, making it an offline operation.

1. Huawei OceanStor Dorado 8000 and 18000 Storage Systems, Product Description. The hardware specifications section explicitly lists components like interface modules, disks (SSDs), and BBUs as hot-swappable. (See section "Hardware Architecture" and "RAS Features").

2. Huawei, HCIP-Storage V5.0 Training Material (H13-624). The hardware architecture module describes the various components of the storage systems. It details that disks, power supplies, fan modules, BBUs, and interface modules are designed for online replacement to ensure service continuity.

3. Huawei OceanStor Dorado Storage System, Parts Replacement Guide. This official maintenance document provides step-by-step procedures for replacing components. The procedures for BBUs, disks, and interface modules are all designated as online operations, while procedures for a backplane replacement would require a full system shutdown.