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質問 # 75
What is the recommended Maximum Transmission Unit (MTU) size for the replication ports on a FlashArray?
正解：C
解説：
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.
質問 # 76
Twelve stretched pods are synchronously replicating between an ActiveCluster (AC) FlashArray pair. A new unstretched pod is created and then is stretched, but the operation fails.
What is the most likely cause of the operation not completing successfully?
正解：A
解説：
ActiveCluster Scalability Limits: Pure Storage FlashArrays have specific scalability limits regarding the number of "Active" or "Stretched" pods allowed per array or ActiveCluster pair. While these limits can vary slightly based on the Purity//FA version and the specific hardware model (e.g., //X, //XL, or //m), a common architectural limit in many Purity versions is up to 12 stretched pods.
The Scenario Analysis: In this case, the environment already has 12 stretched pods successfully replicating. When the administrator attempts to stretch a 13th pod, the operation fails because the array has hit the maximum concurrent stretched pod count supported by the Purity operating environment for that configuration.
Stretched vs. Unstretched: A pod exists locally (unstretched) without consuming an ActiveCluster pod "slot" in the same way. The failure specifically occurs during the "stretch" operation, which is the point where the synchronous replication relationship and mediator monitoring are established.
Resolution: To resolve this, the administrator would either need to:
Unstretch or Eradicate an existing pod that is no longer needed to free up a slot.
Check the specific Purity Release Notes for the hardware model to see if a firmware upgrade increases the maximum pod limit (some newer versions support more, but 12 is the classic threshold often tested in professional certifications).
質問 # 77
A FlashArray administrator is configuring new hosts. There is an option in the personality settings for the target OS.
When is the best time to configure the personality for a host in Purity?
正解：B
解説：
Definition of Host Personality: In Purity//FA, a Host Personality is a setting applied to a host object that modifies how the FlashArray communicates with that specific initiator. It ensures the array sends the correct SCSI responses that the target Operating System (OS) expects. Common personalities include ESXi, AIX, HP-UX, and Hitachi-VSP.
The Importance of Timing: The best practice is to set the personality during the host creation phase, before any volumes are attached or I/O has commenced. This ensures that from the very first "Inquiry" command sent by the host, the FlashArray responds with the appropriate settings (such as specific VAAI primitives for ESXi or specific ALUA behaviors for other Unix variants).
Risks of Changing Later: While Purity allows you to change a host personality later, doing so while volumes are connected and I/O is active can be disruptive. For many operating systems, a change in personality requires the host to be rebooted or the storage paths to be "rescanned" to recognize the change in device capabilities.
Default Behavior: If no personality is selected, the FlashArray uses a "Generic" personality suitable for standard Windows and Linux distributions. However, for specialized hypervisors like ESXi, failing to set the personality correctly from the start can lead to performance issues or lack of support for hardware acceleration features.
Why Option C is incorrect: Changing the personality after volumes are connected is reactive rather than proactive. It increases the risk of the host misinterpreting the storage device's capabilities, potentially leading to mount failures or path instability.
質問 # 78
Which command provides the negotiated port speed of an ethernet port?
正解：A
解説：
On a Pure Storage FlashArray, Ethernet ports operate at both a physical hardware layer and a logical network configuration layer. If you need to verify the actual physical negotiated port speed of an Ethernet port (for example, verifying if a 25GbE port negotiated down to 10GbE due to switch configurations or cable limitations), you must query the hardware layer directly.
The command purehw list --all --type eth interacts directly with the physical NIC hardware components to report their true link status, health, and dynamically negotiated hardware link speed.
Here is why the other options are incorrect:
purenetwork eth list -- all (B): The purenetwork command suite is primarily focused on the logical Layer 2/Layer 3 networking stack. It is used to configure and list IP addresses, subnet masks, MTU sizes (Jumbo Frames), and routing, rather than focusing on the physical hardware negotiation details of the NIC itself.
pureport list (A): The pureport command suite is specifically used for managing and viewing storage protocol target ports. An administrator would use this to list the array's Fibre Channel WWNs or iSCSI IQNs to configure host zoning or initiator connections, not to verify Ethernet link negotiation speeds.
質問 # 79
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 # 80
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