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| Section | Objectives |
|---|---|
| Monitoring | - Meta Forecasting - Pure1 Auditing and Alerts - Reporting from Pure1, Graphical User Interface (GUI), and Command Line Interface (CLI) |
| Troubleshooting | - Alerts - Port Identification and Configuration - Incorrect Configuration - Troubleshooting Resources |
| FlashArray Administration | - Host Connections Configuration - Array Configuration and Management - Volume Configuration - Storage Concepts - FA File Services Configuration |
| Data Protection | - SafeMode - Replication - Snapshots - ActiveDR - ActiveCluster |
>> FlashArray-Storage-Professional専門知識訓練 <<
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質問 # 65
What is a potential indicator of incorrect configuration on a Pure Storage FlashArray?
正解：C
解説：
Understanding CRC Errors: CRC (Cyclic Redundancy Check) errors occur when the data received at a port does not match the checksum sent by the initiator or switch. In a Pure Storage environment, these are tracked per port and can be viewed via the CLI (purehw list) or the GUI.
Configuration vs. Hardware: While a failing SFP or a damaged fiber cable can cause CRC errors, they are a primary indicator of configuration mismatches in the SAN fabric. Common culprits include:
Port Speed Mismatches: Manually setting a port to 16Gbps when the switch is set to "Auto" or 8Gbps.
Duplex Mismatches: Though rare in modern Fibre Channel, it is a classic Ethernet/iSCSI configuration error.
MTU Mismatches: In iSCSI or NVMe-oF environments, if the FlashArray is configured for Jumbo Frames (MTU 9000) but the switch or host is at MTU 1500, packet fragmentation or CRC-like errors/drops will occur.
Why Option A is incorrect: A blinking status LED on a controller is often part of normal operation (indicating heartbeat or activity). A solid amber LED would be an indicator of a hardware failure, not necessarily a misconfiguration.
Why Option C is incorrect: While latency spikes can be caused by misconfiguration (like incorrect MPIO settings), they are more commonly symptoms of workload changes, "noisy neighbors," or reaching the physical performance limits of the array. CRC errors are a much more specific diagnostic "smoking gun" for port and fabric configuration issues.
Best Practice: When CRC errors are detected, Pure Storage recommends first checking the physical layer (reseating SFPs/cables) and then verifying that the port speed and protocol settings on the FlashArray match the upstream switch configuration exactly.
質問 # 66
Refer to the exhibit:
What is the most likely cause of system space in this capacity graph?
正解：B
解説：
Analyzing the Graph: The provided capacity graph shows a sharp, vertical drop in Unique and Shared space (the teal/green sections) at approximately 10:45. Simultaneously, there is a massive spike in System space (the grey shaded area).
The "System" Space Spike: In Purity, when a volume is deleted and eradicated, the data isn't physically wiped from the flash modules instantly. Instead, the logical references are removed, and the blocks are moved into a "Pending Reclamation" state. In older versions of Purity reporting (or specific views), this pending work is often categorized under System space until the background Garbage Collection (GC) process can physically reclaim it.
The Decay Curve: Notice the grey "System" area gradually tapers down over the following hours (from 11:00 to 14:00). This is the visual representation of the array's Garbage Collection engine working in the background to physically free up those blocks.
Why Option C is incorrect: If SafeMode were enabled, the space would not move into "System" space in this manner; it would remain locked in the Snapshots or Destroyed bucket for the duration of the retention period, preventing the graph from dropping at all.
Why Option A is incorrect: If space reclamation stopped working, the grey "System" area would stay flat and would not decay over time. The fact that it is trending downward proves that reclamation is actively processing the deleted volume.
質問 # 67
When is it possible to simulate snapshot policies in the Pure1 Snapshot Policies (SafeMode)?
正解：A
解説：
In Pure1, the ability to simulate snapshot policies-particularly when assessing the capacity requirements and impact of enabling SafeMode-heavily relies on historical telemetry data. Pure1 uses the data from existing snapshots on the FlashArray to calculate the environment's daily data change rate, as well as the deduplication and compression ratios specific to those workloads.
By analyzing the footprint of existing snapshots, Pure1's analytics engine can accurately project the future storage capacity required if you were to change your snapshot frequency or extend the retention period (for example, locking them down for 7 to 30 days under a SafeMode policy). If a FlashArray does not have any existing snapshots, Pure1 lacks the foundational baseline metrics needed to simulate and forecast the capacity impact of a proposed snapshot policy.
質問 # 68
An administrator needs to enable Remote Assist (RA) on Purity version 6.8.4 to facilitate remote troubleshooting. Due to security restrictions, only certain commands can be executed on the array.
What type of access should the administrator grant when enabling RA?
正解：B
解説：
Remote Assist (RA) Overview: Remote Assist is a secure, customer-initiated tunnel that allows Pure Storage Technical Support Engineers (TSEs) to log into a FlashArray to perform diagnostics and maintenance. It is disabled by default and must be explicitly opened by the customer.
Access Modes in Purity: In modern Purity versions (like 6.8.4), Pure Storage has introduced granular access controls for these support sessions to satisfy enterprise security and compliance requirements (such as SOC2 or HIPAA).
Restricted Access: This mode is specifically designed for high-security environments. When RA is enabled with the Restricted flag, the Support Engineer is limited to a pre-defined subset of non-destructive, read-only, or diagnostic commands. They cannot perform major configuration changes, delete data, or access sensitive metadata without further authorization.
Elevated vs. Secured: * Elevated access (often used during emergency recovery) provides the TSE with broader permissions, including the ability to run system-level scripts and configuration commands that go beyond standard diagnostics.
Secured is often a baseline state but does not imply the specific command-level filtering that "Restricted" does.
Security Best Practice: If a security team mandates that "only certain commands can be executed," Restricted is the correct administrative choice. This ensures that the principle of least privilege is applied even to the vendor's support staff.
質問 # 69
Volume space has increased on a FlashArray and shared space decreased by the same amount.
What does this indicate?
正解：B
解説：
Understanding Space Reporting: To understand this behavior, you have to look at how Purity calculates capacity. Pure Storage uses a data reduction engine where data is deduplicated and compressed.
Volume Space vs. Shared Space:
Volume Space: This represents the unique data belonging to a specific volume that is not shared with any other volume via deduplication or snapshots.
Shared Space: This represents the data that is common across multiple volumes or snapshots. If you have two volumes that are clones of each other, most of that data is "Shared." The "Shift" Mechanism: When a volume is deleted (and potentially eradicated), the data it once shared with other volumes no longer needs to be "shared." Imagine Volume A and Volume B share 100GB of data. That 100GB is accounted for in Shared Space.
If you delete Volume B, that 100GB of data is now only referenced by Volume A.
Consequently, that 100GB is moved from the Shared Space bucket into Volume A's Volume Space bucket.
Net Result: The total physical space used on the array remains the same initially, but the accounting shifts. You see a decrease in Shared Space and an identical increase in the Volume Space of the remaining volumes that held those deduplication references.
質問 # 70
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