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>> FlashArray-Storage-Professional的中合格問題集 <<
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質問 # 48
What is the Pure Storage recommended Maximum Transmission Unit (MTU) size for the replication ports on a FlashArray?
正解：C
解説：
Understanding MTU: The Maximum Transmission Unit (MTU) defines the largest size of a packet or frame that can be sent in a single network transaction. The standard Ethernet MTU is 1500 bytes. Anything larger than 1500 bytes is referred to as a Jumbo Frame.
Replication Efficiency: Replication involves moving large amounts of data between arrays. Using standard 1500-byte frames results in higher overhead because the CPU must process a larger number of headers for the same amount of data. By increasing the MTU, the FlashArray can pack more data into each frame, reducing CPU interrupts and improving overall throughput.
The Pure Recommendation: Pure Storage specifically recommends an MTU of 9000 for both iSCSI and Replication traffic. This is the industry standard for Jumbo Frames that balances efficiency with compatibility across most enterprise-grade switches.
Configuration Requirements: It is critical to remember that MTU must be configured end-to-end. For an MTU of 9000 to work on the replication ports:
The FlashArray replication ports must be set to 9000.
The network switches along the path (and any routers/ISLs) must support and be configured for at least 9000.
The target array's replication ports must also be set to 9000.
Why 9216 (Option A) is incorrect: While some switches support a "Baby Giant" or slightly larger MTU like 9216 to account for VLAN tagging overhead, Pure's internal and best practice documentation specifically points to 9000 as the standard setting for the array's interface.
質問 # 49
Which storage protocol is best suited for a Hyper-V cluster in an ethernet-switched environment?
正解：A
解説：
Protocol Compatibility: While NVMe-over-Fabrics (NVMe-oF) is the future of high-performance storage, support for it within specific hypervisor ecosystems varies. In the context of Microsoft Hyper-V, especially in older or standard Ethernet-switched environments, iSCSI remains the most mature, widely supported, and native protocol for block storage.
Ethernet Constraints: The question specifies an Ethernet-switched environment. This immediately rules out NVMe/FC (NVMe over Fibre Channel), as that requires dedicated Fibre Channel switching infrastructure and HBAs, not standard Ethernet.
NVMe/RoCE vs. iSCSI: While NVMe/RoCE (RDMA over Converged Ethernet) runs on Ethernet, it requires specialized NICs (RDMA-capable) and a specific switch configuration (PFC/LFC) to ensure a lossless fabric. Hyper-V has specific requirements for RoCE (often tied to SMB Direct for File services), but for general block storage volumes in a standard Ethernet environment, iSCSI is the "best suited" due to its ease of deployment, native Windows initiator support, and lack of requirement for specialized lossless hardware.
Pure Storage Best Practices: Pure Storage FlashArrays provide industry-leading iSCSI performance. When using iSCSI with Hyper-V, Pure recommends using the native Windows MPIO (Multi-Path I/O) with the "Least Queue Depth" policy to ensure optimal load balancing across the Ethernet fabric.
質問 # 50
A storage administrator is troubleshooting multipathing issues.
What is the CLI command that allows the administrator to sample the I/O balance information at a consistent interval?
正解：C
解説：
Command Purpose: The purehost monitor command is the primary tool in the Pure Storage CLI for observing real-time performance and connectivity health from the perspective of the hosts connected to the FlashArray.
The --balance Flag: When the --balance flag is added, the output shifts from general performance (IOPS, bandwidth, latency) to showing how I/O is distributed across the available paths (controllers and ports). This is critical for identifying "unbalanced" loads, which usually point to misconfigured MPIO (Multi-Path I/O) on the host side (e.g., a host only using one controller's ports).
Interval vs. Repeat:
The --interval flag specifies the time in seconds between each sample. In option C, --interval 15 tells the array to refresh the data every 15 seconds.
The --repeat flag (seen in option A) is used to limit the total number of samples taken before the command exits. However, in standard troubleshooting, the administrator typically wants a consistent stream of data until manually stopped (Ctrl+C).
--resample (seen in option B) is not a valid flag for the purehost monitor command in Purity.
Best Practice: When troubleshooting multipathing, Pure Storage recommends monitoring the balance to ensure that the "Relative I/O" percentage is roughly equal across all active paths. Large discrepancies often indicate that the host's MPIO policy is set to "Failover Only" instead of the recommended "Round Robin" or "Least Queue Depth."
質問 # 51
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：A
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 # 52
If an NFS client can mount the FA File export shares with the IP address, but not the fully qualified domain name, what is most likely causing the issue?
正解：C
解説：
When an NFS client successfully mounts an export using the target's IP address, it proves that the fundamental network connectivity (routing, firewalls) and the storage protocol layer (NFS export policies, host access permissions) are functioning correctly.
However, if the exact same mount attempt fails when using the Fully Qualified Domain Name (FQDN) of the FlashArray file service, the issue lies entirely with name resolution. The Domain Name System (DNS) is responsible for translating human-readable FQDNs into the IP addresses required for network communication. If the client cannot reach the DNS server, or if the DNS server lacks the correct A or AAAA records for the FlashArray's file Virtual IP (VIP) addresses, the client won't be able to resolve the name to the IP, causing the mount command to fail.
Here is why the other options are incorrect:
Issue with the Active Directory (AD) controller (A): Active Directory is primarily used for directory services, user authentication, and authorization (such as mapping permissions for SMB or NFSv4). While AD environments usually include DNS, an "AD controller issue" in the context of storage protocols usually points to permission denials, not host name resolution failures. Furthermore, since the mount works via IP, basic access is already validated.
Issue with the OpenLDAP (C): Similar to AD, OpenLDAP provides directory services for user mappings (UID/GID) and authentication. It does not perform FQDN-to-IP resolution.
質問 # 53
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