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## 12.2 System components 

This section describes each of the components that make up the IBM Storwize V5000 Gen2 system. The components are described in terms of location, function, and serviceability. 

## 12.2.1 Enclosure midplane 

The enclosure midplane  connects the node or expansion canisters to the power supply units and to the drives. The midplane is part of the enclosure midplane assembly, which consists of the midplane and the front section of the enclosure. 

During the basic system configuration, vital product data (VPD) is written to the enclosure midplane. On a control enclosure midplane, the VPD contains information, such as worldwide node name (WWNN) 1, WWNN 2, machine type and model, machine part number, and serial number. On an expansion enclosure midplane, the VPD contains information, such as machine type and model, machine part number, and serial number. 

The enclosure midplane is initially generic and it is configured as a control enclosure midplane or expansion enclosure midplane only when the VPD is written. After the VPD is written, a control enclosure midplane is no longer interchangeable with an expansion enclosure midplane and vice versa. 

Important:  The enclosure midplane must be replaced by a trained IBM service support representative (SSR) only. 

For more information about the midplane replacement process, see IBM Storwize V5000 Gen2 Knowledge Center. 

## 12.2.2 Node canisters 

For a complete overview of maintenance tasks, see IBM Knowledge Center. 

Two node canister slots are on the top of the unit. The left slot is canister 1, and the right slot is canister 2. 

Figure 12-1 shows the rear view of a fully equipped control enclosure. 

<img src='content_image/977723.jpg'>

