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>> FlashArray-Storage-Professional日本語関連対策 <<
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質問 # 20
A new array is directly connected to a host with Direct Attach Copper (DAC) cables. The link does not come up.
Which document can be used to help identify the issue?
正解：A
解説：
When physical links fail to establish-especially when using Direct Attach Copper (DAC) cables or Twinax-the most common culprit is a hardware compatibility mismatch. Pure Storage arrays have specific requirements for optics and cabling to ensure optimal signal integrity and performance.
The FlashArray Transceiver and Cable Support article (available on the Pure Storage Support portal) is the authoritative, verified resource for this scenario. It provides a comprehensive, constantly updated compatibility matrix detailing exactly which vendor DAC cables (e.g., Cisco, Brocade, Arista) and transceivers are officially validated and supported for use with specific FlashArray models and port types. If an unsupported DAC cable is used, the switch or host bus adapter (HBA) on the array might simply refuse to bring the link up.
Here is why the other options are incorrect for this specific issue:
The FlashArray User Guide (A): This guide is excellent for day-to-day administration (volume creation, host grouping, etc.) but is too broad to contain granular, constantly updating hardware compatibility matrices for specific cables.
The Port Usage and Definitions article (C): This document explains the logical and physical purpose of the ports on the back of the controllers (e.g., defining which ports are used for management, replication, or host connectivity), but it does not dictate hardware transceiver or cable interoperability.
質問 # 21
What is unified storage for Pure?
正解：B
解説：
Definition of Unified Storage: In the storage industry, "Unified Storage" refers to a platform that can natively serve both Block-level storage (accessed via protocols like Fibre Channel, iSCSI, or NVMe-oF) and File-level storage (accessed via protocols like NFS or SMB) from a single pool of capacity and under a single management interface.
Pure Storage Implementation (FA File): Pure Storage achieved unified storage on the FlashArray through the introduction of Purity//FA File Services. Unlike traditional unified storage that often required a "gateway" or separate hardware "heads," Pure's implementation runs natively on the FlashArray controllers.
Shared Resources: On a unified FlashArray, the global storage pool is shared between volumes (Block) and file systems (File). All of Pure's core data services-such as deduplication, compression, and SafeMode snapshots-apply globally across both block and file data.
Protocol Diversity: While Option A mentions NFS and SMB, those are strictly File protocols. Option C mentions iSCSI and FC, which are strictly Block protocols. Only Option B correctly identifies the combination of Block and File, which defines the "Unified" architecture of the FlashArray.
質問 # 22
An administrator is testing FA File Services configurations and unintentionally disabled User Mapping on an active NFS Export.
What happens to file accessibility on that export?
正解：B
解説：
User Mapping in FA File: On a Pure Storage FlashArray, User Mapping is the mechanism that translates identities between different protocols (like mapping a Windows SID to a Unix UID/GID) or between an external directory service (like Active Directory or LDAP) and the local file system permissions.
The Impact of Disabling Mapping: When User Mapping is disabled on an active NFS export, the FlashArray can no longer resolve the identity of the user attempting to access existing files. Because NFS (specifically NFSv3 and NFSv4.1 supported by Pure) relies on these identifiers to verify file ownership and ACLs, existing files-which are tagged with specific owner IDs-become effectively "orphaned" from the perspective of the incoming request.
Access vs. Creation: * Existing Files: Accessibility is lost because the system cannot verify that the user has the rights to read or modify the file without the mapping logic.
New Files: Interestingly, in many "No Mapping" configurations, a user may still be able to create new files (often defaulting to a 'nobody' or 'anonymous' UID depending on the export rules), but they will immediately lose the ability to manage or access them once created because the mapping link is broken.
Real-time Application: Unlike some legacy storage systems that require a service restart, Purity applies export policy changes dynamically. As soon as the "User Mapping" toggle is disabled, the logic is removed from the data path, impacting active sessions immediately.
質問 # 23
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?
正解：B
解説：
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.
質問 # 24
How should an administrator configure initiator-to-target connections for zones with multiple initiators?
正解：C
解説：
Zoning Best Practices: In a Fibre Channel SAN environment, zoning is used to partition the fabric to ensure that initiators (hosts) can only see the targets (FlashArray ports) they are intended to communicate with.
The "Single Initiator" Rule: Pure Storage, following industry-standard SAN best practices (and Cisco/Brocade recommendations), strongly advises using Single Initiator Zoning. This means each zone should contain exactly one initiator (HBA port) and one or more targets (FlashArray ports).
Why Single Initiator to Multiple Targets (Option B)?:
Isolation: This prevents "Initiator-to-Initiator" communication. If multiple initiators are in the same zone, they may attempt to communicate with or probe each other (Registered State Change Notifications - RSCNs), which can cause host instability, driver timeouts, or discovery issues.
Troubleshooting: It simplifies troubleshooting. If a port is experiencing CRC errors or flapping, the impact is isolated to that specific host's zone rather than affecting a broad "group" zone.
Efficiency: When a target port changes state (e.g., during a controller reboot), the switch sends an RSCN. In a single-initiator zone, only that specific host is notified. In a multi-initiator zone, every host in the zone is interrupted to process the notification, even if they aren't using the port that changed.
Target Selection: While the zone should have only one initiator, it can (and should) include multiple target ports from the FlashArray (usually one port from CT0 and one from CT1 for the same fabric) to provide path redundancy and allow the host's MPIO software to manage failover.
質問 # 25
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