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NEW QUESTION # 73
A FlashArray administrator has created a 1PB volume and wants to resize it to 1TB, but accidentally sets the new size to 1GB.
How can the administrator recover the potentially truncated data?
Answer: A
Explanation:
Purity Safety Mechanism: In Pure Storage Purity, volume resizing-specifically downsizing-is a destructive operation because it can lead to data truncation. To protect against human error (like the one described in the scenario), Purity automatically creates a "pre-resize" snapshot of the volume before the change is committed.
The "Destroyed" Snapshot: When a volume is shrunk, Purity generates a snapshot of the volume in its state immediately before the shrink operation. This snapshot is placed in the Destroyed (or "Pending Eradication") bucket.
Recovery Process: To recover the data, the administrator does not simply "resize back up" (Option C), as the data beyond the 1GB mark may have already been unmapped or treated as truncated by the host file system. Instead, the administrator should locate the auto-generated snapshot in the Destroyed volumes/snapshots section, "recover" it to make it active again, and then either copy that snapshot to a new volume or overwrite the truncated volume from that snapshot.
SafeMode Integration: If SafeMode is enabled, these auto-generated snapshots are even more secure, as they cannot be manually eradicated before the timer expires, ensuring a guaranteed recovery point for accidental shrinks.
Why Option C is incorrect: Increasing the size of a volume back to 1TB (or 1PB) does not automatically restore the data that was logically removed or truncated when the volume was set to 1GB; the host file system would still see the data as corrupted or missing.
NEW QUESTION # 74
A storage administrator is troubleshooting a FlashArray that is critically low on space. They have successfully deleted and eradicated a large volume, but used space keeps increasing.
What is a possible cause?
Answer: B
Explanation:
Logical vs. Physical Reclamation: When an administrator "Eradicates" a volume, the FlashArray immediately removes the logical reference to that data. However, the physical blocks are not "wiped" instantly. Instead, those blocks are marked as "eligible for reclamation" by Purity's background Garbage Collection (GC) process.
Workload Prioritization: Purity is designed to prioritize Host I/O (production performance) over background system tasks. If the array is under an extremely high workload (high Load Meter percentage), Purity will automatically throttle the Garbage Collection process to ensure the application latency remains as low as possible.
The "Reclamation Lag": If the incoming write rate from the hosts (new data being written) exceeds the speed at which the throttled GC process can reclaim space from the eradicated volume, the "Used Space" metric will continue to trend upward. This is a common scenario when arrays are pushed to their performance or capacity limits simultaneously.
Why Option A is incorrect: The 24-hour safeguard applies to Destroyed volumes (the "Pending Eradication" bucket). Once an administrator manually clicks Eradicate, that safeguard is bypassed, and the space should logically be freed. If the space is still not reflecting as "Free," it is a back-end processing delay, not a timer delay.
Why Option C is incorrect: In the Purity Operating Environment, the array does not require the host to "unmount" or "disconnect" before it can reclaim space. Once the volume is destroyed and eradicated on the array side, those blocks are gone from the array's perspective, regardless of the host's state (though the host will likely experience I/O errors).
NEW QUESTION # 75
The administrator needs to remove a volume from a ratcheted protection group.
How can this be accomplished?
Answer: A
NEW QUESTION # 76
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 # 77
A storage administrator needs to determine what actions were taken on the array by the previous shift and is only able to access the FlashArray via CLI.
Which command provides that information?
Answer: B
Explanation:
Understanding the Audit Log: In Purity, accountability and security are maintained through the Audit Log. This log captures every administrative action taken on the array, whether through the GUI, CLI, or REST API. It records who performed the action, what the action was (e.g., volume creation, host deletion), and when it occurred.
The CLI Command: The command pureaudit list is the specific CLI tool used to display these logs. By default, it lists events in chronological order, making it the perfect tool for an administrator to review "shift change" activities.
Command Options: * pureaudit list can be filtered with flags like --user to see actions by a specific admin, or --start-time and --end-time to narrow down the "previous shift" window.
Why Option C is incorrect: puremessage (accessed via puremessage list) is used to view Alerts and Notifications generated by the system (e.g., a failed drive or a high-temperature warning). While it tells you what the array did, it does not track what users did.
Why Option A is incorrect: This is not a valid Purity command syntax. Purity does not use double-dashes to "pipe" or combine independent commands like pureaudit and puremessage in that manner.
NEW QUESTION # 78
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