The initial setup of a new Pure Storage FlashArray begins with configuring the primary controller, which is designated as CT0. An administrator connects a laptop to the management or console port of CT0 to launch the setup wizard. This first step is crucial for establishing the array's identity, setting management IP addresses, and configuring network services like DNS and NTP. Once CT0 is configured, it facilitates the configuration of the secondary controller (CT1) and brings the array online.

B. CT1 configuration: CT1 is the secondary controller. Its configuration and integration into the cluster are managed after the primary controller, CT0, has been successfully set up.

C. Code upgrade: A Purity code upgrade can only be performed on an array that is already configured and operational. It is a post-installation or maintenance task, not the initial setup step.

1. Pure Storage FlashArray //X Installation and Upgrade Guide: In the "Initial Array Setup" section, the procedure explicitly directs the installer to connect their computer to the management port (MGMT0) or console port on controller CT0 to begin the configuration process. This confirms CT0 configuration is the first software-related step. (Document available via Pure Storage Support Portal, specific page numbers vary by version, but the section is consistently named "Initial Array Setup" or similar).

2. Pure Storage FlashArray: Purity//FA 6.4.x GUI Administration Guide: The guide's initial setup instructions (often in Chapter 2, "Getting Started") detail the process of accessing the Purity GUI for the first time. This access is established through the IP address configured on CT0 during the initial setup phase, reinforcing that CT0 configuration precedes all other management activities.