Pure Storage FlashArray-Implementation-Specialist - Pure Certified FlashArray Implementation Specialist (FAIS) Exam

The Pure Storage product portfolio is strategically segmented to address different tiering requirements in the modern datacenter. While the FlashArray//X and FlashArray//XL are optimized for absolute performance and ultra-low latency using Triple-Level Cell (TLC) flash and Storage Class Memory (SLC), the FlashArray//C and FlashArray//E lines are engineered specifically for capacity consolidation and tier-2 workloads.

To achieve massive storage density at a much lower cost per terabyte, the //C and //E models exclusively utilize Quad-Level Cell (QLC) flash architecture. QLC technology stores four bits of data per NAND cell, significantly increasing physical capacity compared to TLC, while the Purity operating system intelligently mitigates the inherent wear-leveling and write-amplification challenges traditionally associated with dense QLC media.

Because QLC and TLC DirectFlash Modules (DFMs) share the exact same physical U.2 form factor and slot seamlessly into the identical drive bays, Implementation Engineers must be able to visually distinguish them onsite to prevent accidentally mixing drive types within a single chassis. Pure Storage strictly color-codes the physical release latches on the drive carriers to prevent this mistake: QLC DFMs feature distinct gray tabs , whereas standard TLC DFMs feature blue tabs. Identifying the gray tabs ensures the engineer is working with the correct //C or //E capacity modules before proceeding with the physical admission process.

Calculating rack space requirements is a fundamental pre-installation task. The FlashArray//XL series features a larger chassis than the //X series to accommodate its increased power, cooling, and DirectFlash capabilities.

The FlashArray//XL Chassis itself occupies 5 Rack Units (5U) .

A standard DirectFlash Shelf (DFS) occupies 2 Rack Units (2U) .

In this scenario, the customer is installing one //XL chassis and two DFS shelves.

Calculation:

1 x //XL Chassis (5U) = 5U

2 x DirectFlash Shelves (2U each) = 4U

Total = 9U.

Therefore, the Implementation Engineer must verify that there are at least 9 contiguous Rack Units available in the cabinet. Standard best practice also suggests placing the shelves immediately above or below the controller chassis to accommodate the 3-meter maximum cable length for the backend fabric, so these 9U should ideally be in a single block.

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Configuring replication involves two distinct steps: setting up the physical network interfaces (IP addresses) and then connecting the arrays (partnerships). The question specifically asks where to configure replication IP settings .

In the Purity//FA GUI, the configuration of Ethernet interfaces—regardless of their use for Management, iSCSI, or Replication—is centralized under the Settings tab, specifically within the Network sub-menu.

Settings > Network : Here, the user selects the Ethernet ports (e.g., eth2, eth3) designated for replication and assigns them IP addresses, netmasks, and gateways (or assigns them to a subnet).

Storage > Array Connections : This is where you use those configured IPs to connect to a remote array and establish the replication partnership.

Storage > Replication : This tab is used to monitor replication sessions and manage protection groups (snapshots/policies), not to configure the underlying interface IPs.

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The FlashArray//XL features a 5 Rack Unit (5U) chassis height.

This form factor represents a significant change from the standard FlashArray//X and //C series, which utilize a 3U chassis. The increase to 5U is engineered to support the massive performance and density requirements of the //XL platform.

Key Design Features: The 5U height accommodates:

Dual Controllers: Larger, high-performance controllers with increased airflow requirements.

40 DirectFlash Module Slots: Double the drive density of the 3U chassis (which holds 20), allowing for petabytes of effective capacity in the base unit.

4 Power Supplies: A 2+2 redundant power architecture.

9 PCIe Slots: Extensive I/O expansion for host and backend connectivity.

Airflow: Dedicated fan modules and thermal ducting to cool the high-wattage components (up to 3.5kW max power draw).

The FlashArray//XR2 and //XR3 (representing the FlashArray//X generation) utilize a standardized 3U (3 Rack Units) chassis form factor.

This 3U chassis is the foundation for the majority of the FlashArray//X line, including the //X10, //X20, //X50, //X70, and //X90 models. It is designed to be compact while providing sufficient airflow and space for the dual controllers, two data packs (up to 20 DirectFlash Modules), and power/cooling infrastructure.

Dimensions: Approximately 5.12 inches (13 cm) in height.

Rack Layout: Implementation Engineers must reserve 3U of contiguous space for the base controller chassis. If expansion shelves are included, they typically require an additional 2U each (for SAS or NVMe shelves).

Option B (4U) is not a standard height for current Pure Storage arrays. Option C (5U) refers to the FlashArray//XL , a larger, performance-optimized platform designed for maximum scale and density, which uses a significantly taller chassis to accommodate more expansion slots and power components. Therefore, for the specified R2/R3 X-series, 3U is the correct height.

On the FlashArray//XL , the designated PCIe slots for DirectFlash Shelf (DFS) connectivity are Slot 0 and Slot 6 .

The FlashArray//XL features a high-density, high-performance architecture that utilizes 100GbE RoCE (RDMA over Converged Ethernet) for backend connectivity to expansion shelves, replacing the SAS protocols used in previous generations.

Slot Assignment: To ensure maximum throughput and redundancy, these backend I/O modules must be balanced across the controller's PCIe bus. The hardware guide and slot map for the //XL explicitly assign Slot 0 (typically on the lower riser) and Slot 6 (on the upper riser) for the installation of the 2-port 100GbE NVMe-oF cards used to connect DirectFlash Shelves.

Configuration: If a customer orders a FlashArray//XL with external capacity, these cards will be pre-installed or must be seated in these specific slots by the engineer. Using other slots (like 1 or 7, which are often reserved for host I/O or other expansion cards) would result in an invalid configuration or lack of connectivity to the backend storage media.

Executing an intra-series Hardware Non-Disruptive Upgrade (HWNDU) from a FlashArray//XR3 to an //XR4 is a highly orchestrated procedure. It involves failing over active I/O responsibilities, physically removing legacy controller nodes, and seamlessly introducing newer generation hardware without causing any downtime for the connected hosts.

Before an Implementation Engineer physically unplugs or removes a secondary controller—or initiates a failover to take the primary controller offline—it is an absolute prerequisite to verify that the frontend host multi-pathing is healthy. If a host is accidentally single-pathed to the controller that is about to be removed, an all-paths-down (APD) event will occur, causing immediate application disruption.

To safely validate this from the array's perspective, the engineer must execute the iobalance --sampletime 30 command within the Purity CLI. This specialized diagnostic command forces the array to actively sample and monitor the incoming SCSI/NVMe read and write commands across all frontend target ports for a continuous 30-second window. The output produces a detailed matrix showing exactly how traffic is distributed across both controllers and all active host initiators. If the data confirms that I/O is cleanly balanced and redundantly flowing across the surviving controller's paths, the engineer can confidently proceed with the physical removal phase of the HWNDU.

The FlashArray//XL requires 4 x C19/C20 power cables to connect to the rack Power Distribution Units (PDUs).

The FlashArray//XL chassis (5U) is significantly larger and draws more power than the standard FlashArray//X series (3U). It is equipped with four high-capacity Power Supply Units (PSUs) to support the increased thermal and electrical load of the dense DirectFlash Modules and high-performance controllers.

Connector Type: To handle the higher amperage safely, the //XL utilizes IEC C20 inlets on the chassis side (rectangular with horizontal pins) rather than the standard C14 inlets found on most servers. Consequently, the required cables must have a C19 connector (female) to plug into the array and a C20 connector (male) to plug into the PDU (assuming a high-power PDU).

Quantity: Since the chassis has four PSUs for N+2 redundancy, four distinct cables are required. The standard C13/C14 cables (Option A/B) used for lower-wattage IT equipment are physically incompatible and electrically insufficient for the //XL platform.

If a Pure Storage Technical Support Engineer (TSE) is unavailable to immediately perform the remote health checks upon the completion of the physical installation, the correct procedure is to verify that Remote Assist (RA) is enabled and update the support case with this information.

Standard operating procedure dictates that the Implementation Engineer must not close the install case until the array has been health-checked and verified by Support. Closing the case (Option B) would signal that the work is complete when the critical validation step is missing, potentially leaving the customer with an unverified system. Emailing the account team (Option A) is helpful for visibility but does not advance the technical workflow required to close the loop.

By confirming RA is open (using purearray remoteassist) and documenting the active session port in the case notes, the Implementation Engineer enables the Support team to perform the health checks asynchronously as soon as a TSE becomes available. This ensures the "handshake" between the onsite engineer and the remote support team is maintained without delaying the engineer's departure from the site, while guaranteeing the array will be validated before final sign-off.

The FlashArray//XR4 architecture utilizes massive 100GbE RDMA over Converged Ethernet (RoCE) for its backend loops to maintain NVMe-level performance across external expansion shelves. Because of the sheer bandwidth requirements, specific port and slot assignments are strictly regulated by the Purity operating system.

On a standard //XR4 model, the controllers feature dedicated, integrated 100GbE ports on the motherboard (typically enumerated as eth18 and eth19) which are strictly reserved for connecting the first DirectFlash Shelf loop. When an Implementation Engineer needs to install a second DirectFlash Shelf, those onboard ports are already fully saturated.

To establish a new dedicated backend fabric loop for the second shelf, the engineer must install an additional dual-port 100GbE RoCE PCIe expansion card into a designated slot (typically Slot 4). Once this card is properly seated, cabled, and recognized by the Purity operating system, it enumerates the new high-speed network interfaces natively as ETH6 and ETH7 . The Implementation Engineer must use these exact interfaces to connect the shelf to ensure the backend topology passes the mandatory pre-flight validation scripts and functions at optimal NVMe-oF speeds.