FlashArray-Implementation-Specialist Exam Dumps - Pure Storage FAIS Questions and Answers

The upgrade from a FlashArray//X10 (or X20) to a FlashArray//X50 requires a mandatory power supply unit (PSU) upgrade .

While the FlashArray//X series utilizes a shared chassis design (3U) for models X10 through X90, the power requirements differ significantly between the entry-level and performance-tier controllers.

X10/X20: These models typically ship with 1000W or 1200W power supplies, which are sufficient for their lower-power CPUs and component loads.

X50/X70/X90: These "Performance" class arrays utilize higher-wattage Intel Xeon processors and often support denser NVMe configurations, necessitating 1600W power supplies to ensure stability and N+1 redundancy.

When a customer performs a Data-in-Place upgrade (swapping controllers) from an X10 to an X50, the existing chassis is retained, but the lower-capacity PSUs must be physically swapped for the high-capacity 1600W units to support the new X50 controllers. Conversely, upgrades like X50 > X70 (Option B) or R2 > R3 (Option C) typically occur within the same power tier, utilizing the existing 1600W PSUs.

The Fibre Channel (FC) I/O card type is the only option listed that is universally compatible and supported across all FlashArray models, from the entry-level //X10 and //X20 up to the high-end //X90 and //XL.

Fibre Channel: Pure Storage architectures rely heavily on Fibre Channel as the primary enterprise storage protocol. All chassis generations and controller sizes feature PCIe risers compatible with Pure's standard 16Gb or 32Gb Fibre Channel HBAs.

Ethernet/iSCSI: While all arrays support iSCSI, the physical card type varies.

10GBase-T: This refers to "copper" Ethernet (RJ45). This card type is not supported on all models. High-end FlashArrays (like the //X70, //X90, and //XL) typically utilize SFP+ or QSFP28 cages for optical connectivity (10/25GbE or 40/100GbE) and do not standardly support 10GBase-T copper cards due to power and latency characteristics.

Therefore, while the protocol (iSCSI) is supported everywhere, the specific physical card (10GBase-T) is not. Fibre Channel cards remain the consistent hardware constant across the entire product line.

When performing a Hardware Non-Disruptive Upgrade (HWNDU) or preparing for a Purity software upgrade, the Implementation Engineer must log in with a user account that has full administrative privileges to execute upgrade commands, run health checks, and manage the array state.

The pureuser account is the standard administrative superuser for the FlashArray. It is used for all day-to-day administration and maintenance tasks, including initiating upgrades via the CLI (pureinstall or pureupdate commands) and verifying system health (purearray health, pureadm list). The puresetup account is strictly for initial array initialization (setting IPs and array name) and is disabled or restricted once the array is up and running. pureinstall is a command, not a user account. Therefore, pureuser is the correct authenticated session required to manage the upgrade process.

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When performing a controller upgrade (Non-Disruptive Upgrade) from an //X50R3 to an //X50R4, the specific hardware configuration of the source array dictates the target bill of materials. The presence of SAS drives in the chassis indicates that the source is a legacy or transitional configuration, as the standard //X R4 platform is optimized for end-to-end NVMe (DirectFlash).

However, the question asks for the specific controller SKU required. In Pure Storage nomenclature for upgrades, the standard controller replacement part is typically the base model code, here FLASHARRAY//XC50 R4 .

The "XC" designation often refers to the controller component itself in upgrade kits. While special considerations apply to SAS media (which are usually phased out or require specific handling during R4 upgrades since R4 natively drops legacy SAS support on the motherboard), the controller part number itself remains the standard R4 SKU (Option C). Options like "SE" or "NS" (often denoting specific encryption or networking variants) are not the standard identifiers for the base controller upgrade in this context.

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The FlashArray//XR5 (and //E family) introduces a significant architectural shift regarding Non-Volatile RAM (NVRAM). In previous generations (like R2/R3), NVRAM was provided by dedicated PCIe modules installed in specific "NVB" slots in the chassis.

In the //XR5 architecture, Pure Storage moved to Distributed NVRAM . The NVRAM functionality is integrated directly into the DirectFlash Modules (specifically the DFMDs - DirectFlash Module with Distributed NVRAM). This allows the NVRAM capacity to scale with the storage and removes the bottleneck of dedicated slots.

For a system to function correctly, a minimum number of these NVRAM-equipped modules must be present to form the initial write buffer and system quorum. The standard installation requirement for an //XR5 is that the first 10 slots (Slots 0-9) are populated with these specific DFMDs. This ensures there is sufficient distributed NVRAM capacity to boot the Purity operating environment and handle incoming writes safely. The Implementation Engineer must populate these slots first before adding standard DFMs in the remaining slots.

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When adding a second DirectFlash Shelf to a FlashArray//XL , the connectivity utilizes PCIe Slot 6 (in conjunction with Slot 0).

FlashArray//XL Architecture: The //XL chassis distributes its backend NVMe-oF (100GbE RoCE) connectivity across two dedicated PCIe slots to ensure redundancy and maximum bandwidth. As established in hardware diagrams, Slot 0 (lower riser) and Slot 6 (upper riser) are the designated slots for the 2-port 100GbE backend cards.

Expansion Logic:

First Shelf: Typically connects to Port 0 of the card in Slot 0 and Port 0 of the card in Slot 6 (providing HA).

Second Shelf: Connects to the remaining ports (Port 1) on the same cards in Slot 0 and Slot 6.

Exam Context: In the context of "which slot must be used" for the expansion or specifically highlighting the secondary backend slot distinct from the primary host slots, Slot 6 is the correct identifier for the backend expansion capability on the //XL. Options A (Slot 0) is the primary, but C (Slot 6) is often the specific answer required to demonstrate knowledge of the //XL's unique split-riser backend layout compared to legacy arrays.

The FlashArray//XR4 utilizes onboard 100GbE RoCE (RDMA over Converged Ethernet) ports for connecting to the first loop of DirectFlash Shelves, removing the need for dedicated PCIe add-in cards for the base configuration. The port mapping for these onboard backend ports differs from previous generations.

On the //XR4 controller chassis, the specific Ethernet interfaces designated for the first DirectFlash Shelf loop are typically the high-numbered onboard ports. In this specific exam context and hardware revision, ETH 18 and ETH 19 are identified as the correct primary backend connectivity ports .

Implementation Engineers must connect the QSFP28 cables from the "uplink" ports on the first shelf (IOM0 and IOM1) to ETH18 and ETH19 on the controllers (CT0 and CT1) respectively. Using incorrect ports (like ETH0/1, which are management) would result in the shelf not being detected by the storage fabric.

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A frequent question Implementation Engineers receive from security-conscious customers after a new installation is how to verify that data-at-rest encryption is active. Unlike legacy storage arrays where encryption requires a separate software license, specialized self-encrypting drives (SEDs), or complex CLI toggles, Pure Storage FlashArray handles encryption natively and transparently.

There are no commands like puresecurity status or purearray encryption list in the Purity CLI because data-at-rest encryption is an always-on, non-configurable architectural feature . It cannot be turned off by an administrator, support engineer, or malicious actor.

Purity secures data at rest using AES-256 bit encryption (FIPS 140-2 certified). The array uses three dependent layers of internal keys (an Array Key, an SSD Key, and a Data Encryption Key) that are automatically generated, partitioned, and spread across the DirectFlash Modules. Because this process operates continuously in the background without user intervention, the standard and officially documented response for an Implementation Engineer is to explain the always-on nature of the architecture and provide the customer with the official Pure Storage FlashArray Data Security and Compliance whitepaper to satisfy their compliance auditors. (Note: Option C mentions RDL or Rapid Data Locking, which is an external KMIP key management feature, not the base data-at-rest encryption itself).

Pure Storage DirectFlash Shelves (DFS) are designed with high-efficiency, enterprise-grade power supply units (PSUs). These PSUs are "auto-ranging," meaning they can accept a wide range of input voltages, typically from roughly 90V to 264V AC.

While data centers often prefer 208V-240V power sources for better efficiency (less heat loss and lower amperage draw for the same wattage), the hardware is fully validated and supported to operate on standard 110V/120V circuits . There is no "temporary only" restriction or hardware lockout that prevents operation on 120V.

Therefore, if the customer's high-voltage PDUs are full, the Implementation Engineer can safely connect the DirectFlash Shelf to the available 120V outlets. The shelf will function normally, provided the circuit has sufficient amperage capacity (amps) to handle the slightly higher current draw that results from using a lower voltage. This configuration is supported for the entire service life of the shelf.

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When implementing FA File services (Pure Storage's file services protocol support), the array must integrate with the customer's existing directory infrastructure (like Active Directory) for user authentication and permission management. By default, the FlashArray utilizes its management interface to perform DNS resolution and establish communication with domain controllers.

This design choice simplifies initial deployment because the management network is typically already configured with access to core infrastructure services like DNS and NTP. While the filevip (File Virtual IP) and its associated virtual interfaces (vif) are used for actual SMB/NFS data traffic between clients and the array, the control plane traffic for directory services and authentication lookups is routed through the management port (ct0.eth0/ct1.eth0 or the virtual management IP).

It is critical for Implementation Engineers to verify that the management network has the necessary firewall rules and routing to reach the customer's domain controllers and DNS servers. If the management interface is isolated on a dedicated out-of-band network without access to these services, the FA File directory service configuration will fail, even if the data interfaces (filevip) are correctly cabled and IP'd.

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