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The Storwize V5010 supports one SAS chain for each control enclosure, and up to 10 expansion enclosures can be attached to this chain. The node canister uses SAS port 1 for expansion enclosures. 

Always cable from the top down. Cabling from the bottom to the top is not supported. 

Figure 12-19 shows the SAS cabling on a Storwize V5010 with three attached expansion enclosures. 

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The Storwize V5020 supports one SAS chain for each control enclosure, and up to 10 expansion enclosures can be attached to this chain. The node canister uses SAS port 1 for expansion enclosures. 

Always cable from the top down. Cabling from the bottom to the top is not supported. 

