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NEW QUESTION # 71
What should an administrator configure when setting up device-level access control in an NVMe/TCP network?
Answer: C
Explanation:
In any NVMe-based storage fabric (including NVMe/TCP, NVMe/FC, and NVMe/RoCE), the standard method for identifying endpoints and enforcing device-level access control is the NQN (NVMe Qualified Name).
The NQN serves the exact same purpose in the NVMe protocol as an IQN (iSCSI Qualified Name) does in an iSCSI environment, or a WWPN (World Wide Port Name) does in a Fibre Channel environment. It is a unique identifier assigned to both the host (initiator) and the storage array (target subsystem). When setting up access control on a Pure Storage FlashArray, the storage administrator must capture the Host NQN from the operating system and configure a Host object on the array with that specific NQN. This ensures that only the authorized host can discover, connect to, and access its provisioned NVMe namespaces (volumes).
Here is why the other options are incorrect:
VLANs (A): Virtual LANs are used for network-level isolation and segmentation at Layer 2 of the OSI model. While you might use a VLAN to separate your storage traffic from your management traffic, it is a network security measure, not a device-level access control mechanism for the storage protocol itself.
LACP (C): Link Aggregation Control Protocol (LACP) is a network protocol used to bundle multiple physical network links into a single logical link for redundancy and increased bandwidth. It has nothing to do with storage access control or mapping volumes to hosts.
NEW QUESTION # 72
A storage administrator is configuring a new volume and wants to provision 500GB. If the administrator accidentally selects PB, what will happen?
Answer: A
Explanation:
Pure Storage FlashArrays utilize Thin Provisioning as a core, always-on architectural principle. When a volume is created, the "size" assigned to it is merely a logical limit (a quota) presented to the host; no physical back-end flash capacity is allocated or "pinned" at the time of creation.
Because of this architecture, Purity allows administrators to create volumes that are significantly larger than the actual physical capacity of the array (this is known as over-provisioning). If an administrator accidentally selects PB (Petabytes) instead of GB, the Purity GUI will allow the volume to be created because it is a logical operation that doesn't immediately consume 1PB of physical flash. However, Purity includes a built-in safety check: if the requested logical size is exceptionally large or exceeds the current physical capacity of the array, the GUI will present a warning or confirmation prompt to ensure the administrator is aware of the massive logical size being provisioned before finalizing the change.
Here is why the other options are incorrect:
The volume will be created and space will immediately be used (A): This describes "Thick Provisioning," which Pure Storage does not use. Space is only consumed on a FlashArray when unique data is actually written by the host and processed by the deduplication and compression engines.
The volume will not be created and a warning will be displayed (C): Purity does not strictly forbid over-provisioning. While it warns the user to prevent human error, it does not block the creation of the volume, as over-provisioning is a standard practice in thin-provisioned environments.
NEW QUESTION # 73
A FlashArray//C R4 has ports Eth0 and Eth1 connected to a switch using 100Gb/s Direct Attach Copper (DAC) cables. The administrator is unable to configure these ports for iSCSI services.
Why is this occurring?
Answer: B
Explanation:
On the Pure Storage FlashArray//C R4 (as well as the //XL and //E series architectures), the onboard 100Gb/s Ethernet LOM (LAN on Motherboard) ports-specifically eth0 and eth1-are purpose-built and strictly reserved for DirectFlash Shelf (DFS) connectivity.
Pure Storage uses these dedicated 100GbE ports to run NVMe over RoCE (RDMA over Converged Ethernet), effectively extending the array's internal PCIe backplane to additional backend storage shelves. Because these ports are hardcoded exclusively for back-end shelf expansion, the Purity operating environment fundamentally restricts them from being assigned IP addresses for front-end host I/O services. Therefore, an administrator will be completely unable to configure eth0 or eth1 for iSCSI, NVMe/TCP, or Replication. Front-end iSCSI services must instead be configured on the dedicated Host I/O PCIe cards (which typically appear as eth2, eth3, etc., depending on the slot configuration).
Here is why the other options are incorrect:
The ports are designated for Management connectivity (A): On modern FlashArrays, dedicated management ports are typically out-of-band 1GbE/10GbE RJ45 ports (often designated as vir0 or specific management eth ports on older hardware), not the ultra-high-speed 100Gb/s QSFP28 ports.
The DAC cables are not compatible with the array's ports (B): While incompatible cables can prevent a link from coming up physically, the specific reason the administrator cannot configure the ports for iSCSI in the Purity software is due to the port's hardcoded role (DFS), not the physical cable type.
NEW QUESTION # 74
A storage administrator is troubleshooting a FlashArray that is critically low on space. They have successfully deleted and eradicated a large volume, but used space keeps increasing.
What is a possible cause?
Answer: A
Explanation:
Logical vs. Physical Reclamation: When an administrator "Eradicates" a volume, the FlashArray immediately removes the logical reference to that data. However, the physical blocks are not "wiped" instantly. Instead, those blocks are marked as "eligible for reclamation" by Purity's background Garbage Collection (GC) process.
Workload Prioritization: Purity is designed to prioritize Host I/O (production performance) over background system tasks. If the array is under an extremely high workload (high Load Meter percentage), Purity will automatically throttle the Garbage Collection process to ensure the application latency remains as low as possible.
The "Reclamation Lag": If the incoming write rate from the hosts (new data being written) exceeds the speed at which the throttled GC process can reclaim space from the eradicated volume, the "Used Space" metric will continue to trend upward. This is a common scenario when arrays are pushed to their performance or capacity limits simultaneously.
Why Option A is incorrect: The 24-hour safeguard applies to Destroyed volumes (the "Pending Eradication" bucket). Once an administrator manually clicks Eradicate, that safeguard is bypassed, and the space should logically be freed. If the space is still not reflecting as "Free," it is a back-end processing delay, not a timer delay.
Why Option C is incorrect: In the Purity Operating Environment, the array does not require the host to "unmount" or "disconnect" before it can reclaim space. Once the volume is destroyed and eradicated on the array side, those blocks are gone from the array's perspective, regardless of the host's state (though the host will likely experience I/O errors).
NEW QUESTION # 75
An administrator is preparing an array pair for ActiveDR and is trying to calculate the total minimum bandwidth requirement.
What percent of bandwidth above the incoming write rate should be allocated to accommodate for unexpected write bursts and still maintain near-sync RPO?
Answer: A
Explanation:
ActiveDR Bandwidth Sizing: ActiveDR is a continuous, asynchronous replication technology designed to provide near-zero RPO. Because it streams data continuously rather than in discrete snapshot intervals, the bandwidth between the source and target arrays must be able to handle the application's write workload.
Handling Write Bursts: Application workloads are rarely flat; they have peaks and valleys. If you size the bandwidth exactly to the average change rate, any burst in write activity will cause the replication lag to increase, thereby increasing your RPO.
The 30% Rule: Pure Storage best practices and sizing guides recommend providing a 30% buffer (headroom) above the measured average write rate. This extra capacity ensures that during a high-IO period, the replication engine has enough "pipe" to catch up quickly and return to a near-sync state.
Calculation Example: If a workload generates an average of 100 MB/s of new unique data, the administrator should ensure at least 130 MB/s of usable, dedicated bandwidth is available between the sites.
Consequences of Under-sizing: If only 10% (Option A) is used, the array may struggle to recover from even minor bursts, leading to a consistently climbing RPO. 50% (Option B) is often considered safe but can be cost-prohibitive or overkill for standard networking budgets unless the workload is exceptionally volatile.
NEW QUESTION # 76
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