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NEW QUESTION # 22
What command must an administrator run to use newly installed DirectFlash Modules (DFM)?
Answer: C
Explanation:
When new DirectFlash Modules (DFMs) or data packs are physically inserted into a Pure Storage FlashArray, the Purity operating environment detects the new hardware but places the drives in an "unadmitted" state. This safety mechanism prevents the accidental incorporation of drives and allows the system to verify the firmware and health of the modules before they are actively used to store data.
To formally accept these drives into the system's storage pool so their capacity can be utilized, the administrator must execute the CLI command puredrive admit. Once this command is run, the drive status transitions from "unadmitted" to "healthy," and the array's usable capacity expands accordingly.
Here is why the other options are incorrect:
pureadmin -- admit-drive (A): This is syntactically incorrect. The pureadmin command suite is used for managing administrator accounts, API tokens, and directory services, not for hardware or drive management.
purearray admit drive (B): This is also incorrect syntax. While purearray is used for array-wide settings and status (like renaming the array or checking space), specific drive-level operations are exclusively handled by the puredrive command structure.
NEW QUESTION # 23
An X20R4 array containing 10 x 4.5TB DirectFlash Modules is running out of capacity. The customer found a data pack scheduled for a FlashArray//C array and has inserted it into the array. The customer is unable to admit the new capacity.
What is a possible reason for this?
Answer: B
Explanation:
Hardware Architecture (X vs. C): Pure Storage maintains two primary FlashArray lines: the FlashArray//X (performance-oriented) and the FlashArray//C (capacity-oriented).
Flash Types (TLC vs. QLC):
FlashArray//X (like the X20R4 mentioned in the question) uses TLC (Triple-Level Cell) DirectFlash Modules (DFMs). TLC provides high performance and high endurance, which is necessary for latency-sensitive mission-critical workloads.
FlashArray//C uses QLC (Quad-Level Cell) DirectFlash Modules. QLC provides significantly higher density at a lower cost per GB, but it has different performance and endurance profiles compared to TLC.
Compatibility Constraints: Purity//FA is designed to manage specific flash geometries. QLC modules are not compatible with the //X series arrays. The controller logic and software-defined flash management in an X20R4 are tuned for the voltage and timing characteristics of TLC flash.
The Admission Process: When a new data pack is inserted, the array performs a "handshake." If the controller detects a module type that it is not hardware-qualified to support (in this case, QLC in an //X chassis), it will refuse to admit the capacity to prevent system instability or data integrity issues.
Why Option A is incorrect: Modern FlashArrays (since the //M series) use NVMe over a PCIe backplane for DirectFlash Modules. Pure moved away from SAS (Serial Attached SCSI) for its primary data drives years ago to eliminate the performance bottlenecks associated with the SAS protocol.
Why Option C is incorrect: An X20R4 uses TLC flash. If the data pack were TLC, it would likely be compatible (provided it met the minimum module count and Purity version requirements).
NEW QUESTION # 24
What is the best practice for configuring VMFS UNMAP for ESXi 6.7 or later?
Answer: A
Explanation:
What is UNMAP?: UNMAP (SCSI command 0x42) is the mechanism that allows a host (like ESXi) to inform the storage array that specific blocks of data are no longer in use (e.g., after a VM is deleted or moved). This is critical for Pure Storage because it allows the array to reclaim that space and maintain high data reduction ratios.
Evolution in ESXi: In versions prior to 6.5, UNMAP was a manual process executed via the CLI. Starting with ESXi 6.7, VMware introduced Automatic Space Reclamation, which runs in the background.
The Pure Storage Recommendation: Pure Storage recommends setting the reclamation priority to Auto with Low Priority.
Low Priority: This ensures that the UNMAP commands are sent to the FlashArray at a steady, manageable rate (roughly up to 25 MB/s to 100 MB/s depending on the Purity version). Because FlashArrays are built on a high-performance metadata engine, "Low Priority" is more than sufficient to keep up with even high-churn environments without causing any contention for active application I/O.
Why avoid High Priority (Option B)?: Setting it to high priority or using a fixed high-burst rate can lead to "bursty" SCSI traffic. While the FlashArray can handle the load, it is considered a best practice to keep background maintenance tasks like space reclamation at a lower priority to ensure the "Big Three" (latency, bandwidth, IOPS) for production workloads remain optimized.
Verification: You can verify that UNMAP is working by looking at the Data Reduction metrics in the Purity GUI or Pure1. If the "Thin Provisioning" or "Reclaimed" numbers are increasing after file deletions, the host is correctly communicating its freed space to the array.
NEW QUESTION # 25
How would a FlashArray administrator view external latency for write requests for a specific volume?
Answer: A
Explanation:
The Analysis Tab: In the Pure Storage FlashArray GUI, the Analysis tab is the primary location for deep-dive performance troubleshooting and historical data visualization. While the Storage tab provides a real-time "at-a-glance" view of a volume, the Analysis tab allows for granular filtering of specific metrics.
Granular Metric Filtering: When troubleshooting latency, it is critical to distinguish between Read and Write operations, as they interact with the Purity operating environment differently (e.g., writes hitting NVRAM vs. reads hitting the Flash modules).
External vs. Internal Latency: Pure Storage differentiates between "Array Latency" (internal processing) and "External Latency" (the time seen by the host). By navigating to Analysis > Performance, an administrator can drill down into the Volumes sub-tab.
Selecting the Volume and Operations: Once a specific volume is selected, the chart typically defaults to a combined view. To isolate "external latency for write requests," the administrator must use the legend/filters to select "Write" while deselecting "Read" and "Mirrored Write" (which refers to synchronous replication traffic in ActiveCluster environments). This provides a clean graph of the round-trip write latency specifically for that volume's host I/O.
Why other options are incorrect: Option B refers to physical port health and hardware status, not volume-level performance. Option C provides basic volume metadata and real-time total latency, but lacks the granular historical filtering (selecting/deselecting specific I/O types) required for detailed performance analysis.
NEW QUESTION # 26
What happens when you demote the original source pod?
Answer: C
Explanation:
ActiveCluster and Pod Roles: In a Pure Storage ActiveCluster or ActiveDR environment, a Pod is a management container for volumes. To move workloads or perform a planned failover between two arrays, you use the Promote and Demote commands.
The Reversal Process: When you have two pods in a replication relationship (Source and Target), data flows from the Promoted (Active/Source) pod to the Demoted (Passive/Target) pod.
When you Demote the current source, it transitions from a "read-write" state to a "read-only" (passive) state.
If the other pod in the pair is then Promoted, Purity automatically intelligently reverses the direction of replication. The array that was previously receiving data now begins sending incremental updates back to the original source.
Continuous Protection: This design ensures that you don't have to manually tear down and recreate replication schedules every time you switch production sites. The system tracks the metadata changes and ensures that only the delta (changed blocks) are sent in the new direction.
Why Option C is incorrect: If replication were simply paused, the two sites would quickly drift out of sync, making it impossible to fail back without a full baseline resync.
Why Option A is incorrect: Demoting a pod does not delete any data; it simply changes the access characteristics and replication role. The data remains fully intact on the storage media.
NEW QUESTION # 27
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