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NEW QUESTION # 71
Which Purity command can be used to validate I/O is balanced across initiators?
Answer: B
Explanation:
To validate that I/O traffic is correctly distributed across a host's initiators (Fibre Channel WWNs or iSCSI IQNs), the correct command is purehost monitor --balance.
Ensuring "multipathing balance" is a critical post-installation check. If a host is configured correctly with Multipath I/O (MPIO) software (like DM-Multipath on Linux or MPIO on Windows), read/write requests should be distributed relatively evenly across all active paths to the storage array.
Command Function: The purehost monitor command provides real-time performance statistics for hosts. Adding the --balance flag switches the view to a granular breakdown of IOPS and Bandwidth per initiator for the specified host.
Interpretation: An Implementation Engineer looks for initiators showing 0 IOPS or significantly lower traffic than others, which would indicate a path failure, zoning issue, or incorrect MPIO policy (e.g., Failover Only instead of Round Robin). Options A and B are incorrect syntax; purehost list shows configuration (not real-time stats), and iobalance is not a valid Purity command argument.
NEW QUESTION # 72
During a hardware NDU from FlashArray//XR2 or XR3 to an XR4 model, which default service on-board ports are NO longer present in the XR4 controller design?
Answer: C
Explanation:
In the architectural evolution from FlashArray//XR2 and //XR3 to the FlashArray//XR4, Pure Storage made significant changes to the controller's rear panel and I/O design to accommodate higher performance and PCIe Gen 4 capabilities. One of the most critical changes for an Implementation Engineer to plan for during a hardware Non-Disruptive Upgrade (NDU) is the removal of the onboard, default iSCSI ports that were present on previous generations.
On //XR2 and //XR3 controllers, there were onboard Ethernet ports often used for iSCSI host connectivity without requiring a discrete PCIe adapter. However, the //XR4 controller design removes these dedicated onboard iSCSI ports to streamline the motherboard design and shift host I/O strictly to PCIe add-in cards. The
//XR4 retains onboard ports specifically for Management (Mgmt) and Replication connectivity, ensuring that administrative access and array-to-array replication can still be maintained without additional hardware.
Consequently, if a customer was relying solely on the onboard ports for iSCSI traffic on their legacy //XR2 or
//XR3, the Bill of Materials (BOM) for the upgrade to //XR4 must include discrete Ethernet/iSCSI PCIe cards to migrate those connections. Failure to identify this architectural difference during the pre-upgrade inventory can result in a loss of host connectivity or an inability to cable the new controllers correctly, as the expected physical ports simply will not exist on the new chassis.
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NEW QUESTION # 73
During a hardware NDU from a FlashArray//X20R3 to an X20R4-LL (low-line) model, the Implementation Engineer encounters a failure during the power supply check. Voltage readings are correct.
What is a likely cause of this failure?
Answer: B
Explanation:
When performing a Hardware Non-Disruptive Upgrade (HWNDU) to the FlashArray//XR4 generation, Implementation Engineers must be acutely aware of power constraints. The //XR4 architecture introduced massive performance upgrades, leveraging PCIe Gen4 and newer Intel processors. Consequently, standard
//XR4 arrays strictly require high-line power (200V-240V) to operate.
However, to accommodate entry-level customers in smaller datacenters or edge locations, Pure Storage released the //X10R4-LL and //X20R4-LL ("Low-Line") models. These specific models are equipped with power supplies designed to run on standard 120V circuits.
The critical tradeoff for using 120V low-line power is a strict physical limitation on available wattage.
Because 120V circuits cannot deliver the peak wattage required to spin up a fully populated chassis while driving the Gen4 compute overhead, the //X10R4-LL and //X20R4-LL strictly support a maximum of 10 capacity drives (a single data pack) in the chassis.
If an Implementation Engineer is upgrading an older //X20R3 that had 20 drives (which was previously supported on low-line power due to lower CPU overheads) to an //X20R4-LL, the pre-flight power supply validation script will intentionally fail. The array detects that the 120V supplies cannot safely support the 20 physical drives currently seated in the chassis. To resolve this, the customer must either provide 208V+ high- line power and use standard R4 power supplies, or migrate the excess capacity to an external DirectFlash Shelf (which has its own independent power).
NEW QUESTION # 74
An Implementation Engineer is installing a FlashArray//XR4 and needs to add an extra card to support a second DirectFlash Shelf. What will be the resulting pair of interfaces?
Answer: A
Explanation:
When expanding a FlashArray//XR4 with additional DirectFlash Shelves (DFS), discrete PCIe Ethernet/RoCE cards are added to the chassis to provide the necessary backend connectivity. The FlashArray operating system (Purity) enumerates network interfaces sequentially based on slot order and onboard port detection.
On the //XR4 platform, the onboard ports and standard primary expansion slots typically occupy the interface names eth0 through eth5 (depending on the exact transceiver and daughter card configuration, where eth0-3 are often onboard/mezzanine). When a new 2-port expansion card is installed into the designated slot (e.g., Slot 3) to support a second shelf loop, Purity assigns the next available interface identifiers to these physical ports.
In a standard deployment configuration for a second shelf, these new ports are enumerated as ETH6 and ETH7. The Implementation Engineer should verify these specific interfaces in the GUI or CLI (pureport list) to ensure the card is recognized and to cable the second shelf correctly to these ports, rather than assuming they will be eth4/5 which might be assigned to the first shelf or other internal functions.
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NEW QUESTION # 75
Where can the NVRAM on a FlashArray//E be located?
Answer: B
Explanation:
The FlashArray//E (and the //XR4/R5 family) utilizes a modern architecture that moves away from the dedicated NVRAM modules found in legacy generations (like the //XR2 and //XR3). In those older systems, NVRAM was housed in specific PCIe cards plugged into the chassis.
In the FlashArray//E architecture, the Non-Volatile RAM (write buffer) functionality is Distributed directly onto the storage media itself. These specialized drives are called DFMDs (DirectFlash Modules with Distributed NVRAM).
By integrating the NVRAM into the DFMs, the array scales its write buffer cache linearly with capacity and removes the bottleneck of fixed NVRAM slots in the chassis. This allows for higher density and simplified hardware designs. During installation or inventory, engineers must distinguish between standard DFMs (which store data only) and DFMDs (which store data and act as the write cache), ensuring the correct number of DFMDs are present to form the system quorum.
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NEW QUESTION # 76
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