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| Section | Weight | Objectives |
|---|---|---|
| FlashArray Files | 12% | - File Services
|
| Data Protection | 18% | - Protection and Recovery
|
| Administration | 30% | - Core FlashArray Administration
|
| Monitoring | 20% | - Pure1 and GUI Monitoring
|
| Troubleshooting | 20% | - System Diagnostics
|
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NEW QUESTION # 56
A FlashArray//XL is used for NVMe-RoCE services. The array has been lightly loaded and has performed as expected. A new workload has been added to the array, which is within the array's performance envelope. The change has resulted in extreme latency and service outages for all workloads utilizing NVMe-RoCE.
Which misconfiguration is this a symptom of?
Answer: B
Explanation:
Requirement for Lossless Ethernet: NVMe over RoCE (RDMA over Converged Ethernet) requires a lossless fabric to function correctly. Unlike standard iSCSI which uses TCP for error recovery, RoCE assumes the network will not drop packets. If the network is "lossy," performance degrades significantly.
The Role of PFC: Priority Flow Control (PFC) (IEEE 802.1Qbb) is the specific mechanism used in Data Center Bridging (DCB) to provide flow control on a per-priority basis. It allows the switch to send a "pause" frame to the sender when buffers are full, preventing packet drops.
Symptom Analysis: In the scenario provided, the array itself is not overloaded ("within the performance envelope"). However, the addition of a new workload increased traffic to the point where buffer congestion occurred. Because PFC was likely misconfigured (either on the FlashArray ports, the network switches, or the host NICs), the network dropped packets instead of pausing traffic. This leads to "go-back-N" retransmissions and massive latency spikes that affect all workloads sharing that fabric.
Pure Storage Best Practices: Pure Storage documentation for NVMe-RoCE emphasizes that PFC must be enabled and consistent across the entire path. If there is a mismatch in PFC configuration, the resulting packet loss will cause the symptoms described: extreme latency and potential service outages.
NEW QUESTION # 57
What is the recommended Maximum Transmission Unit (MTU) size for the replication ports on a FlashArray?
Answer: C
Explanation:
Pure Storage strongly recommends an MTU size of 9000 (Jumbo Frames) for replication networks-such as those used for Asynchronous Replication, ActiveCluster, and ActiveDR-as well as for iSCSI and NVMe/TCP data networks.
A 9000-byte MTU significantly reduces protocol overhead and CPU processing load on the storage controllers by allowing a much larger payload of data to be transmitted inside a single network packet. During heavy replication, this drastically increases throughput and maximizes bandwidth efficiency.
Here is why the other options are incorrect:
1500 (B): While 1500 bytes is the standard default MTU for Ethernet and is exactly what Pure Storage recommends for the management ports (vir0), it is not the recommended optimization for high-throughput replication traffic. (Note: If your network cannot support 9000 end-to-end, 1500 must be used to prevent packet fragmentation, but 9000 remains the best-practice recommendation).
4200 (A): This is an arbitrary number and is not a standard network MTU size used in Pure Storage environments.
NEW QUESTION # 58
How would a FlashArray administrator view external latency for write requests for a specific volume?
Answer: C
Explanation:
In the Pure Storage FlashArray GUI, granular performance metrics (Latency, IOPS, Bandwidth) are located under the Analysis > Performance tabs. When you navigate to the Volumes sub-tab and select a specific volume, Purity displays a unified line graph tracking the performance of that volume over time.
By default, the Latency graph simultaneously plots Read, Write, and Mirrored Write (for volumes participating in an ActiveCluster or synchronous replication pod) latencies. Because these lines can overlap or compress the Y-axis (especially if one metric spikes), isolating a specific metric requires interacting with the graph's legend.
To view the exact, un-obscured latency for standard write requests to that volume, the administrator should click on "Read" and "Mirrored Write" in the chart's legend. This deselects those metrics, effectively hiding their lines from the graph and automatically rescaling the view to exclusively display the host write latency.
Here is why the other options are incorrect:
Health > Network (A): The Health tab is used to check the hardware status of the physical controller ports, including link state and errors. While you might see port-level throughput or queue depth here, it does not provide volume-specific application latency.
Storage > Volumes > Details (B): The Storage tab is primarily used for provisioning and configuration management. Clicking on a volume here will show its size, data reduction ratio, snapshot policies, and connected hosts, but it does not provide detailed interactive performance graphs.
NEW QUESTION # 59
An administrator setup replicated snapshots for a protection group last week. They left the local snapshot schedule disabled.
How many snapshots are stored locally on the source array?
Answer: C
Explanation:
Replication Fundamentals: On a Pure Storage FlashArray, replication is a snapshot-based process. To replicate a Protection Group (pgroup) to a target array, the system must first create a point-in-time snapshot of the volumes within that group on the source array.
The "Immutable" Rule: Even if the Local Snapshot Schedule is disabled, the act of replicating requires the existence of a local snapshot to serve as the "base" or "source" for the data transfer. Purity does not stream data directly from the active volume to the wire; it creates a snapshot and then replicates the unique blocks contained in that snapshot.
Accounting for Local Copies: When a Protection Group is configured for replication, every snapshot generated by the Replication Schedule is stored locally on the source array. These snapshots will remain on the source array until they are aged out according to the Local Retention policy (even if the local schedule itself is off, the retention policy still applies to those replicated snapshots).
Visibility: If you navigate to the Protection Group in the Purity GUI, you will see these snapshots listed under the "Snapshots" tab. They are functionally identical to local snapshots, meaning they can be used for local clones or restores without needing to pull data back from the target array.
Why Option A and C are incorrect: * Option A: If 0 snapshots were stored, there would be nothing to replicate.
Option C: While Purity uses the most recent snapshot as a reference for delta-tracking, it keeps the entire history of snapshots defined by your retention policy, not just a single one.
NEW QUESTION # 60
The administrator needs to remove a volume from a ratcheted protection group.
How can this be accomplished?
Answer: A
NEW QUESTION # 61
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