IBM Storwize V7000, Introduction And Implementation Manual, Page: 73 / 670

Chapter 2. Introduction to IBM Flex System V7000 Storage Node
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As shown in Figure 2-5, the control canister has only one SAS2 port per canister for the
connection of expansion enclosures to add capacity. There are also two USB connections
available for support use to perform maintenance actions as required.
Figure 2-5 Control enclosure with connection ports and indicators