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質問 # 18
Which network requirement is critical for PowerFlex performance?
正解：C
解説：
PowerFlex relies heavily on network performance for data distribution. Low latency and high bandwidth are critical for optimal operation.
質問 # 19
A Fault Set in PowerFlex requires a minimum of 3 nodes to ensure fault tolerance. True or False?
正解：B
解説：
To utilize Fault Sets effectively for their intended purpose (rack-level fault tolerance), the cluster architecture imposes specific minimums.
PowerFlex relies on distributing data copies (Mesh Mirroring). The standard redundancy scheme creates 2 copies of data. To ensure that data remains available even if one entire Fault Set (e.g., an entire rack) fails, the system must be able to distribute the mirrors across different Fault Sets. Consequently, you generally need a minimum of 3 Fault Sets (System requires 3+ Fault Sets to support 2-copy layouts effectively). Since a Fault Set must contain at least one node, the cluster requires a minimum of 3 nodes to support a Fault Set configuration.
質問 # 20
What is a key requirement for adding new nodes to an existing PowerFlex cluster?
正解：D
解説：
* Validate hardware compatibility (Option C): The most critical technical requirement is ensuring the new nodes are compatible with the existing cluster. This includes verifying that the CPU, RAM, and most importantly, the network interface cards (NICs) and storage devices match the existing nodes or are supported in a mixed-node configuration. Adding a node with incompatible hardware can cause instability or performance degradation (the "straggler" effect).
Incorrect Options:
* Same Protection Domain (A): You can add nodes to a new Protection Domain if you are creating a new fault zone.
* Preconfigure deduplication (B): Deduplication is a Storage Pool setting, not a node setting.
* VLAN tags (D): While networking is important, hardware compatibility is the fundamental prerequisite before configuring network tags.
質問 # 21
Which specific operations can be performed on PowerFlex volumes? (Choose two)
正解：C、D
解説：
PowerFlex Volumes are block-level storage devices mapped to hosts.
* Create Snapshots (Option A): Snapshots are point-in-time copies of a volume. In PowerFlex, snapshots are writable and instantaneous. They share the same data blocks as the source volume until changes are made (Redirect-on-Write). They are essential for backups, testing/dev environments, and creating clones.
* Enable Data Replication (Option D): PowerFlex supports native asynchronous and synchronous replication. This is configured at the Volume level (or via Consistency Groups containing volumes).
You select a volume and pair it with a destination volume on a remote PowerFlex cluster to ensure disaster recovery.
Incorrect Options:
* VLAN tagging (B): This is a network configuration performed at the OS/Switch/Interface level, not on a storage block volume.
* Assign to PD (C): Volumes reside inside a Storage Pool, which resides inside a Protection Domain.
You assign a volume to a Storage Pool upon creation, not directly to a Protection Domain.
質問 # 22
An administrator is tasked with adding two nodes to a PowerFlex cluster. What steps must they take to ensure proper integration? (Select two).
正解：A、D
解説：
To ensure the "proper integration" (meaning the add process succeeds without breaking the cluster):
* Verify hardware compatibility (Option A): You must ensure the new nodes have the same CPU
/RAM profile and, crucially, the same Drive Type/Capacity as existing nodes. Adding a hybrid node to an All-Flash cluster, or a node with incompatible firmware, can cause performance degradation or instability.
* Validate network connectivity (Option B): Before the PowerFlex software can even be installed or added to the cluster, the nodes must have valid IP addresses and be able to communicate with the MDM over the management and data networks (checking MTU, VLANs, and routing).
質問 # 23
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