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NEW QUESTION # 22
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: C
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 # 23
An ActiveCluster (AC) FlashArray pair lost connectivity with each other over the replication network. When the pod failover occurred, a single volume in the stretched pod lost connectivity to its host while other volumes in the stretched pod remained available to the host.
What is the most likely cause of the loss of stretched volume connectivity from the host?
Answer: C
Explanation:
ActiveCluster Connectivity Models: In an ActiveCluster environment, hosts can connect to the arrays using either a Uniform or Non-Uniform access model. In a Uniform model, the host has active paths to both FlashArrays in the cluster.
The Failover Scenario: When the replication network between the two arrays fails (a "split-brain" scenario), the Mediator decides which array keeps the pod online (the winner) and which array takes it offline (the loser) to ensure data consistency.
Analyzing the Symptoms:
The pod failed over, meaning one array is now the exclusive servicer for that pod.
Most volumes in that pod stayed online for the host. This proves that the host is correctly registered in Purity (ruling out Option C) and that the general ActiveCluster/Pod logic is functioning.
Only one specific volume lost connectivity.
The Root Cause (Zoning/Access): If a single volume loses connectivity while others do not, it indicates a pathing issue specific to that volume's visibility. In an ActiveCluster failover, if the "winning" array does not have a physical path to the host for that specific volume (due to missing FC Zoning or Ethernet VLAN tagging on the switches), the host will lose access once the "losing" array drops its paths.
Why Option A is unlikely: If "Uniform access" (the ability to see both arrays) was the issue, it would typically affect all volumes in the pod equally during a failover, not just a single outlier. The fact that the rest of the volumes remained available suggests the host is configured for uniform access, but the specific network plumbing (zoning) for that one volume's path to the surviving array is missing.
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NEW QUESTION # 24
What are the two types of FA File quota limits?
Answer: C
Explanation:
In Pure Storage FlashArray File Services (Purity//FA), administrators can apply Quota Policies to managed directories to control and monitor capacity consumption. When configuring the rules for these quotas, the limits are categorized into two specific types: Enforced and Unenforced.
Enforced Quotas (Hard Limits): When a quota rule is set with the --enforced flag set to True, it acts as a hard boundary. If the users or applications writing to that managed directory hit the specified capacity limit, the FlashArray will actively block any further write operations, ensuring the directory cannot exceed its allocated space.
Unenforced Quotas (Soft Limits): When a quota rule is unenforced (the flag is set to False), it acts purely as a monitoring and alerting threshold. Users can continue to write data and organically grow the directory past the specified limit without application disruption, but the system will track the overage and trigger administrative notifications.
Here is why the other options are incorrect:
File and Block (A): This describes the two underlying storage protocols/architectures the unified FlashArray serves, not the types of capacity quota limits for directories.
Limited and Unlimited (B): While you can theoretically leave a file system to grow "unlimited" up to the size of the array, the specific technical parameters in the Purity quota policy engine are defined as enforced vs. unenforced.
NEW QUESTION # 25
An administrator wants to upgrade an Edge Services agent and sees the Gateway Update Status in the GUI showing "Eligible (updates disallowed)".
What should the administrator do?
Answer: B
Explanation:
Edge Services and Gateways: Pure Storage FlashArray uses Edge Services (often associated with FA File or cloud integrations) to manage communication between the array and external services. The Gateway is the component that facilitates this secure connection.
Update Policy Control: To prevent unplanned outages or changes to the environment, Purity includes a safety toggle for Gateway updates. When the status shows "Eligible (updates disallowed)", it means a newer version of the agent is available on the Pure Storage back-end, but the array's local policy is currently set to prevent automatic or manual "one-click" updates.
GUI Authorization: This is a security and administrative control. An administrator with Array Admin privileges must navigate to the Edge Services/Gateway configuration section in the Purity GUI and explicitly change the setting to "Allow Updates". Once this toggle is enabled, the status will change to "Eligible," and the update can be initiated.
Why Option A is incorrect: While the CLI is used for many advanced support functions, the puresupport namespace is generally reserved for Pure Storage Support technicians and requires a challenge-response session key. Standard agent updates are handled via the administrative GUI.
Why Option B is incorrect: Removing and re-installing the agent is an unnecessary and disruptive process. The "disallowed" status is simply a policy setting, not a corruption of the agent itself.
NEW QUESTION # 26
What is the recommended Maximum Transmission Unit (MTU) size for the replication ports on a FlashArray?
Answer: A
Explanation:
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.
NEW QUESTION # 27
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