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質問 # 51
A customer with an X50R2 array connected to 110V power is due for an upgrade to the latest controller generation.
What is required to allow this upgrade to proceed?
正解：C
解説：
As Pure Storage has iterated through FlashArray generations (moving from //X R2 to R3, R4, and beyond), the power density and performance capabilities of the controllers have increased significantly. Modern high-performance controllers, such as those found in the //X R4 or //XL series, have strict power requirements that often exceed what a standard 110V/120V (Low-Line) circuit can provide.
To support the higher wattage and current draw of modern CPUs and NVRAM modules, Pure Storage requires 200-240V (High-Line) power for its latest generation controllers. If an existing array is currently running on 110V power, it must be migrated to 220V power outlets before the upgrade can proceed. Attempting to run newer, high-spec controllers on 110V power could lead to power supply instability, insufficient cooling performance, or the controllers failing to boot entirely.
Here is why the other options are incorrect:
Call support to schedule a power supply replacement (A): The issue is not a faulty power supply; it is the external electrical infrastructure's inability to provide the necessary voltage/wattage for the new hardware. Replacing the power supply with the same model would not solve the voltage limitation.
Transition the array to DC power (B): While Pure Storage does offer DC power options for specific telco environments, this is not a standard requirement for a typical controller upgrade. Moving to standard high-line AC power (220V) is the standard prerequisite for data center environments.
質問 # 52
An On-Premises ActiveCluster (AC) Mediator is installed on an ESXi server. The mediator was previously online but when the administrator checked the status of the ActiveCluster (AC) pods the mediator status was listed as "unreachable" for both FlashArrays in the ActiveCluster (AC) pair.
What is a possible cause of the mediator being unreachable from both FlashArrays?
正解：A
解説：
The ActiveCluster Mediator (whether it is the Pure1 Cloud Mediator or the On-Premises VM) is a lightweight tie-breaker that communicates continuously with the management interfaces of both FlashArrays. If it was previously online and suddenly reports as "unreachable" from both arrays simultaneously, the issue is almost always caused by a network interruption or firewall rule change blocking the required communication ports between the arrays' management IP addresses and the Mediator VM.
If a network firewall is suddenly configured to drop or deny outbound TCP traffic (such as port 80/443 depending on the specific HTTP/HTTPS discovery and heartbeat configuration) from the FlashArrays to the ESXi-hosted Mediator, the arrays will fail to send their heartbeats, causing the mediator status to drop to "unreachable." Here is why the other options are incorrect:
Fibre Channel (FC) zoning or network access has not been created properly for the host (A): The Mediator is completely independent of the front-end host storage fabric (Fibre Channel or iSCSI). Host zoning issues would prevent the ESXi server from seeing its volumes, but it would not cause the FlashArrays to lose management network connectivity to the Mediator.
The mediator does not reside within a Pure datastore (B): This is actually a strict best practice and requirement. Pure Storage explicitly states that the On-Premises Mediator VM must be deployed in a separate (third) failure domain. It should not reside on the ActiveCluster mirrored datastore, because a site-wide SAN failure would take the mediator offline exactly when it is needed most. Therefore, not residing on a Pure datastore is the correct setup, not a cause for an outage.
質問 # 53
What are the two types of FA File quota limits?
正解：A
解説：
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.
質問 # 54
A storage administrator has presented VMFS datastores from a FlashArray with 10TB of raw capacity.
Why would the administrator see system space when logging in to the FlashArray GUI?
正解：A
解説：
On a Pure Storage FlashArray, "System Space" is a specific GUI-reported metric. Purity has a predefined, hidden internal space budget-typically around 20% of the raw mapped capacity (which would be 2TB on a 10TB array)-reserved for internal array operations. This budget covers RAID/parity overhead, metadata, and reclaimable space (data from deleted volumes, snapshots, or overwritten blocks that are waiting for the backend garbage collection process to fully erase them from the flash chips).
Normally, this internal overhead stays below the 20% budget, and "System Space" displays as 0.00 in the GUI. However, if an administrator deletes a massive amount of data at once, causing the reclaimable space to exceed that 2TB budget, the overflow is prominently displayed in the GUI as "System Space." Here is why the other options are incorrect:
Virtual machines have not yet issued an unmap command (A): If a VMware VM deletes a file but the OS hasn't issued an UNMAP/TRIM command, the FlashArray is completely unaware that the data was deleted. Therefore, the array continues to report that capacity as standard Volume Space, not System Space.
More than 2TB of volume snapshots were destroyed (C): While destroying snapshots leads to reclaimable space, "reclaimable space" (Option B) is the specific, correct Purity architectural term and metric that the system uses to calculate the internal budget threshold.
質問 # 55
What is indicated by the Fibre Channel (FC) hosts in the following output?
正解：B
解説：
Purity Active/Active Architecture: Pure Storage FlashArrays use an Active/Active controller architecture. Under normal operating conditions, both controllers (CT0 and CT1) are healthy and independently serve I/O through their respective physical Fibre Channel ports.
The Scenario (Controller Failover): The output provided shows that the host initiator is seeing target WWNs associated with both CT0 and CT1, but the "Target" column indicates they are all being reached via the paths currently managed by one controller or through a specific failover mechanism.
Virtual WWNs and Transparency: In a controller failover or maintenance scenario, Pure Storage utilizes a feature where the WWNs of the "failed" or "offline" controller are logically moved to or presented by the "surviving" controller. This ensures that the host's MPIO (Multi-path I/O) software does not see a permanent "Path Down" error for those specific WWNs, but rather a transition.
Analyzing the Output: When you see CT1 port WWNs (e.g., 52:4A:93:78:55:2D:E3:10) appearing in the connectivity table in a way that implies they are being routed or presented through the physical infrastructure of CT0, it indicates that the array is in a state where one controller is assuming the identity/connectivity of the other. This is a key troubleshooting indicator that the array is likely undergoing a controller reboot, a Purity upgrade, or has experienced a controller hardware failure.
Why A and B are incorrect: * Option A: Multipathing software on the host handles path failures, but it wouldn't cause the array to report WWNs in this specific "cross-presented" manner in a connectivity log.
Option B: If there were a total outage on CT1 without this presentation mechanism, the paths would simply show as "Disconnected" or be missing from the initiator's view entirely.
質問 # 56
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