Verifying the physical SAS or RoCE cabling topology is a mandatory step before initializing a new shelf. The FlashArray provides a specific engineering-level Python script for this purpose: storage_view.py enclosures .

This script queries the backend fabric and visualizes the connection topology between the controllers and the shelves.

It confirms that both controllers (CT0 and CT1) have redundant paths to the shelf (IOM0 and IOM1).

It verifies that the shelf is visible on the expected ports.

It checks for cabling errors, such as "crossed" cables (connecting a primary port to a secondary port incorrectly) or missing links.

Using this tool ensures that the physical layer is perfectly redundant before data is ever placed on the shelf.

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FlashArray File Services (FA File) brings unified block and file storage capabilities directly into the Purity operating system, allowing customers to provision high-performance SMB and NFS shares alongside their traditional Fibre Channel and iSCSI volumes.

Once the initial FA File networking (Virtual Interfaces) and DNS/Active Directory integrations are configured, the Implementation Engineer must actually create the file structures for the customer. In the Pure Storage Purity GUI, the logical hierarchy for file storage requires the administrator to first create a "File System," which acts as the top-level container, and then create "Directories" within it that will be exported to clients.

To manage, create, or modify these directories, the Implementation Engineer must navigate through the left-hand navigation pane to Storage > File Systems . Clicking into a specific File System reveals the "Directories" tab. From this central pane, the engineer can create new managed directories, apply specific export policies (defining which IPs or users have read/write access), and configure directory-level snapshot schedules. Option B (Settings > Access > Directory Services) is a common distractor, but that menu path is used exclusively for configuring the array's connection to Active Directory or LDAP for administrative login authentication, not for managing storage directories.

The FlashArray//XL series (such as the XL130R5) utilizes a modern backend connectivity architecture for its expansion shelves, specifically the DirectFlash Shelf (DFS). Unlike older generations that might have used SAS (Serial Attached SCSI) for shelf connectivity, the //XL architecture relies on high-speed Ethernet with RoCE (RDMA over Converged Ethernet) to communicate with external media shelves. This ensures that the NVMe drives in the shelf perform with the same low latency as those in the head unit.

To attach a DirectFlash Shelf to a FlashArray//XL130R5, the chassis must be populated with specific PCIe interface cards designated for shelf back-end connectivity. The correct part for this is the FA-XL-100G Ethernet/RoCE 2-Port card. This card provides the necessary 100 Gigabit Ethernet bandwidth and RoCE protocol support required for the NVMe-oF (NVMe over Fabrics) backend fabric that Pure Storage uses.

It is crucial to distinguish this from host-facing cards. While an "iSCSI/RoCE" card exists, the shelf connectivity specifically utilizes the "Ethernet/RoCE" designation in the BOM to differentiate backend fabric ports from frontend host ports. The 200G options are generally reserved for host connectivity or inter-array clustering in specific high-performance setups, but the standard validated card for connecting the DFS to the //XL130R5 is the 100G Ethernet/RoCE adapter. Verifying this line item on the BOM prevents onsite delays where the engineer might otherwise find themselves with incompatible ports for the expansion shelves.

The command purehw list --all is the correct CLI instruction to view the comprehensive status of all hardware components, including the NVRAM modules .

Command Scope: While purehw list provides a general hardware summary, the --all flag (or specifying --type nvram) ensures that granular details about the NVRAM modules—such as their presence, health status, and firmware/update status—are displayed.

NVRAM Context: In FlashArray models that utilize dedicated NVRAM modules (like the FA-400, //M, or specific //X configurations), these components are critical for write acknowledgement. During an upgrade or installation, verification that these modules are "healthy" and "idle" (not destaging) is mandatory.

Incorrect Options:

purearray list (Option A) displays high-level array attributes like the array name, ID, and overall OS version, but not component-level hardware status.

puredrive list (Option B) is specifically for managing the storage media (SSDs/DirectFlash Modules) and does not report on the non-volatile RAM cache modules housed in the controller or chassis.

The command pureboot list is the correct tool to verify which Purity version is designated to load upon the next system reboot.

FlashArray controllers maintain two boot partitions (often referred to as banks) for redundancy and upgrade safety. When an upgrade is performed, the new Purity software image is written to the inactive bank.

Verification: Running pureboot list displays the status of both boot banks (e.g., Primary and Secondary) and explicitly flags which version is "Running" and which is set for "Next Boot."

Why it's critical: Just checking the currently running version (using pureversion or purearray list) is insufficient during an upgrade workflow. An engineer must confirm that the boot pointer has successfully switched to the new version before issuing the reboot command. If pureboot list shows the old version as "Next Boot," a reboot would simply reload the current code, indicating the upgrade installation failed or wasn't finalized.

This scenario reinforces the standard Pure Storage controller replacement methodology during an inter-generational Hardware NDU. The start_ndu controller-ndu script is a specialized internal tool explicitly designed to adjust system-level tunables on a newly inserted controller so that it can seamlessly integrate with a peer controller of a different hardware footprint (e.g., an //XR3 peer and an //XR4 or //XR5 new controller).

The Implementation Engineer must run this script before initializing CT0 (or CT1, depending on which side is currently being replaced). The exact required workflow dictates that the Purity operating system must first be installed onto the new controller's internal boot drives so the OS is present to modify. Once installed, the tunable script is executed from the command line.

Only after these HWNDU tunables are safely set can the engineer proceed to initialize the controller using puresetup, allowing it to sync its NVRAM securely and establish High Availability (HA) with the older surviving node. Attempting to initialize the controller before setting this tunable will cause the cluster's health checks to fail and reject the mismatched node, stalling the upgrade process.

During a post-installation health check or right before initiating a Hardware Non-Disruptive Upgrade (HWNDU), verifying that frontend host multipathing is functioning correctly is arguably the most critical safety procedure an Implementation Engineer performs. If a host is single-pathed or improperly zoned, failing over a controller could trigger an All-Paths-Down (APD) event.

To validate that host traffic is redundant and healthy, the engineer must execute the purehost monitor --balance command within the Purity CLI.

This powerful diagnostic tool instructs the FlashArray to actively sample incoming read and write SCSI/NVMe commands across all connected host initiators for a brief period (defaulting to a 5-second interval). It calculates the exact distribution of traffic and displays it as a percentage ("I/O Relative to Max") for each initiator-target path. If a host has Round Robin MPIO configured properly, the output will show traffic flowing evenly across all active paths (e.g., all paths hovering near 90-100% relative to the busiest path). If the output reveals that 100% of the I/O is pinned to a single path while others sit at 0%, the engineer immediately knows there is a zoning or host-side MPIO misconfiguration to address.

For a Pure Storage FlashArray to fully utilize its predictive support capabilities, it must maintain a persistent, secure outbound connection to the Pure1 cloud infrastructure. This allows the array's Callhome Connection Manager (CCM) to transmit telemetry data, hardware alerts, and heartbeat signals. However, in many enterprise environments, storage management networks do not have direct, unfiltered access to the public internet. Instead, all outbound HTTP/HTTPS traffic must be routed through a corporate proxy server.

To facilitate this, the Implementation Engineer must configure the FlashArray to tunnel its Call Home traffic through the customer's proxy. The officially supported Purity CLI command to achieve this is purearray setattr --proxy https:// < proxy_address > : < port > .

By executing this command, the system modifies its global network attributes. Purity immediately updates the internal routing daemon, instructing it to encapsulate all outgoing Pure1 management traffic and direct it to the specified proxy IP or hostname on the designated port (e.g., port 8080 or 3128). Options B, C, and D are fabricated commands that do not exist within the Purity CLI framework. Once the proxy is set, the engineer should always validate the configuration by running purearray test phonehome to ensure the proxy is properly allowing the traffic to pass through to the Pure Storage cloud endpoints.

On a FlashArray//X20 (R2 or R3) , the default Fibre Channel configuration is a 2-port FC card installed in Slot 2 .

The FlashArray//X hardware architecture differentiates slot usage based on the controller model:

Entry Level (X10/X20): These controllers have a limited number of PCIe lanes and slots available for user expansion. Slots 0 and 1 are often utilized by internal system components or reserved. Therefore, the primary Host I/O card (FC or iSCSI) is standardly installed in Slot 2 . Additionally, due to the entry-level positioning, the 2-port card is the standard default (though 4-port is supported).

Performance Level (X50/X70/X90): As seen in previous questions, these models prioritize Slot 0 for Host I/O and typically default to 4-port cards.

The distinction is critical for Implementation Engineers to ensure they are cabling the correct ports. For an X20, cabling Slot 0 (if a port is even visible) would be incorrect; the active host ports are in Slot 2.

This scenario describes a physical layer mismatch between the FlashArray optics and the customer's switch infrastructure.

The PER (planning document) specified 10 Gb/s , so the Implementation Engineer likely installed 10 Gb SFP+ transceivers into the array.

The SAN Switch is operating at 40 Gb/s (likely using QSFP+ ports).

You cannot simply "force negotiate" a 10Gb SFP+ optic to run at 40Gb/s, nor can you plug a 10Gb SFP+ directly into a 40Gb QSFP+ port without specific breakout cables or QSA adapters that match the signaling. The physical transceivers themselves are incompatible with the link speed required by the switch.

To resolve this, the Implementation Engineer must replace the transceivers with the appropriate type .

If the switch is 40Gb native, the array needs 40Gb (QSFP+) optics (if supported on that slot).

Alternatively, if the customer intends to use 10Gb, they must provide 10Gb ports on their switch side.

Given the prompt implies the SAN is 40Gb, the 10Gb optics in the array are the incorrect hardware for that link.

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