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質問 # 179
An Implementation Engineer is installing a second DirectFlash Shelf (DFS) on a FlashArray//XR4 controller.
How should the Implementation Engineer complete the installation?
正解：C
解説：
The FlashArray//XR4 introduces a new chassis layout and PCIe slot numbering scheme compared to previous generations. For expansion connectivity, specific slots are designated for the backend SAS or Ethernet/RoCE fabric cards that connect to DirectFlash Shelves.
According to the //XR4 hardware guide and expansion best practices, PCIe slot 3 is the designated location for the additional expansion interface card required when adding a second DirectFlash Shelf (or for specific shelf configurations). Slots 0 and 1 are often reserved for host I/O or other functions, and slot numbering
/priority is strict to ensure the BIOS and Purity software correctly recognize the card function.
Installing the card in the wrong slot (like slot 0 or 4, if those are reserved for other uses or primary I/O) could result in the shelf not being detected, the array failing to boot, or suboptimal performance due to PCIe lane allocation. Therefore, the engineer must install the DFS expansion card into PCIe slot 3 and cable the second shelf to the ports on that specific card to ensure a supported and functional configuration.
質問 # 180
During an intra-series upgrade from //XR3 to //XR4, which command should the Implementation Engineer run to verify host connectivity before removing the secondary controller?
正解：B
解説：
In a Non-Disruptive Upgrade (NDU), ensuring that the host is correctly multipathed and balancing I/O across all paths is critical before taking a controller down. If a host is only using paths to the controller about to be rebooted (CT0, for example), taking that controller offline would cause an outage.
The command iobalance --sampletime 30 (or its wrapper purehost monitor --balance) is the standard tool used during the upgrade procedure to validate this state.
iobalance: This script samples the I/O throughput on all ports for a specified duration (e.g., 30 seconds).
It analyzes the distribution of I/O. If it detects that I/O is heavily skewed or missing entirely on the "secondary" paths (the ones that will survive the reboot), it flags a warning.
This allows the Implementation Engineer to pause and remediate the host multipathing configuration (e.g., fixing a bad cable or zoning issue) before proceeding with the controller removal, ensuring the NDU remains truly non-disruptive.
質問 # 181
On a FlashArray//XR4, which port is enabled for the management service by default?
正解：B
解説：
Consistent with previous FlashArray generations, the FlashArray//XR4 adheres to the standard port designation for administrative connectivity.
ETH0 is the primary port enabled for the management service by default.
When an Implementation Engineer first connects to a new //XR4 controller to perform the initial IP configuration, they utilize ETH0 (and often ETH1 for redundancy).
These ports are physically labeled for management and are logically separated from the data and replication traffic in the default configuration.
ETH2 and ETH3 are typically reserved or defaulted for replication traffic, while higher-numbered ports (like ETH10+) are used for host I/O or backend shelf connectivity on the R4 platform. Using ETH0 ensures immediate access to the Purity GUI and CLI without requiring custom port reconfiguration.
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質問 # 182
Which ports are used by default for replication on a FlashArray//XR4?
正解：A
解説：
The FlashArray//XR4 maintains the standard port assignment convention established in previous generations for its onboard Ethernet interfaces.
ETH2 and ETH3 are the default ports designated for Replication traffic.
ETH0 and ETH1 are reserved for Management.
ETH2 and ETH3 are configured by Purity defaults to handle the heavy bandwidth of asynchronous or synchronous replication.
While these assignments can be modified in software, the physical ports labeled eth2 and eth3 on the rear of the chassis are the intended primary interfaces for this function. Implementation Engineers should cable these ports to the replication network switches during the initial install.
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質問 # 183
An Implementation Engineer is planning to add a DirectFlash Shelf to a FlashArray//XL with an existing DirectFlash Shelf. Which PCIe slot must be used for shelf connectivity?
正解：C
解説：
When adding a second DirectFlash Shelf to a FlashArray//XL, the connectivity utilizes PCIe Slot 6 (in conjunction with Slot 0).
FlashArray//XL Architecture: The //XL chassis distributes its backend NVMe-oF (100GbE RoCE) connectivity across two dedicated PCIe slots to ensure redundancy and maximum bandwidth. As established in hardware diagrams, Slot 0 (lower riser) and Slot 6 (upper riser) are the designated slots for the 2-port 100GbE backend cards.
Expansion Logic:
First Shelf: Typically connects to Port 0 of the card in Slot 0 and Port 0 of the card in Slot 6 (providing HA).
Second Shelf: Connects to the remaining ports (Port 1) on the same cards in Slot 0 and Slot 6.
Exam Context: In the context of "which slot must be used" for the expansion or specifically highlighting the secondary backend slot distinct from the primary host slots, Slot 6 is the correct identifier for the backend expansion capability on the //XL. Options A (Slot 0) is the primary, but C (Slot 6) is often the specific answer required to demonstrate knowledge of the //XL's unique split-riser backend layout compared to legacy arrays.
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質問 # 184
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