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NEW QUESTION # 21
A FlashArray//XL is used for NVMe-RoCE services. The array has been lightly loaded and has performed as expected. A new workload has been added to the array, which is within the array's performance envelope. The change has resulted in extreme latency and service outages for all workloads utilizing NVMe-RoCE.
Which misconfiguration is this a symptom of?
Answer: A
Explanation:
Requirement for Lossless Ethernet: NVMe over RoCE (RDMA over Converged Ethernet) requires a lossless fabric to function correctly. Unlike standard iSCSI which uses TCP for error recovery, RoCE assumes the network will not drop packets. If the network is "lossy," performance degrades significantly.
The Role of PFC: Priority Flow Control (PFC) (IEEE 802.1Qbb) is the specific mechanism used in Data Center Bridging (DCB) to provide flow control on a per-priority basis. It allows the switch to send a "pause" frame to the sender when buffers are full, preventing packet drops.
Symptom Analysis: In the scenario provided, the array itself is not overloaded ("within the performance envelope"). However, the addition of a new workload increased traffic to the point where buffer congestion occurred. Because PFC was likely misconfigured (either on the FlashArray ports, the network switches, or the host NICs), the network dropped packets instead of pausing traffic. This leads to "go-back-N" retransmissions and massive latency spikes that affect all workloads sharing that fabric.
Pure Storage Best Practices: Pure Storage documentation for NVMe-RoCE emphasizes that PFC must be enabled and consistent across the entire path. If there is a mismatch in PFC configuration, the resulting packet loss will cause the symptoms described: extreme latency and potential service outages.
NEW QUESTION # 22
An administrator setup replicated snapshots for a protection group last week. They left the local snapshot schedule disabled.
How many snapshots are stored locally on the source array?
Answer: C
Explanation:
Replication Fundamentals: On a Pure Storage FlashArray, replication is a snapshot-based process. To replicate a Protection Group (pgroup) to a target array, the system must first create a point-in-time snapshot of the volumes within that group on the source array.
The "Immutable" Rule: Even if the Local Snapshot Schedule is disabled, the act of replicating requires the existence of a local snapshot to serve as the "base" or "source" for the data transfer. Purity does not stream data directly from the active volume to the wire; it creates a snapshot and then replicates the unique blocks contained in that snapshot.
Accounting for Local Copies: When a Protection Group is configured for replication, every snapshot generated by the Replication Schedule is stored locally on the source array. These snapshots will remain on the source array until they are aged out according to the Local Retention policy (even if the local schedule itself is off, the retention policy still applies to those replicated snapshots).
Visibility: If you navigate to the Protection Group in the Purity GUI, you will see these snapshots listed under the "Snapshots" tab. They are functionally identical to local snapshots, meaning they can be used for local clones or restores without needing to pull data back from the target array.
Why Option A and C are incorrect: * Option A: If 0 snapshots were stored, there would be nothing to replicate.
Option C: While Purity uses the most recent snapshot as a reference for delta-tracking, it keeps the entire history of snapshots defined by your retention policy, not just a single one.
NEW QUESTION # 23
A FlashArray administrator is configuring new hosts. There is an option in the personality settings for the target OS.
When is the best time to configure the personality for a host in Purity?
Answer: A
Explanation:
Definition of Host Personality: In Purity//FA, a Host Personality is a setting applied to a host object that modifies how the FlashArray communicates with that specific initiator. It ensures the array sends the correct SCSI responses that the target Operating System (OS) expects. Common personalities include ESXi, AIX, HP-UX, and Hitachi-VSP.
The Importance of Timing: The best practice is to set the personality during the host creation phase, before any volumes are attached or I/O has commenced. This ensures that from the very first "Inquiry" command sent by the host, the FlashArray responds with the appropriate settings (such as specific VAAI primitives for ESXi or specific ALUA behaviors for other Unix variants).
Risks of Changing Later: While Purity allows you to change a host personality later, doing so while volumes are connected and I/O is active can be disruptive. For many operating systems, a change in personality requires the host to be rebooted or the storage paths to be "rescanned" to recognize the change in device capabilities.
Default Behavior: If no personality is selected, the FlashArray uses a "Generic" personality suitable for standard Windows and Linux distributions. However, for specialized hypervisors like ESXi, failing to set the personality correctly from the start can lead to performance issues or lack of support for hardware acceleration features.
Why Option C is incorrect: Changing the personality after volumes are connected is reactive rather than proactive. It increases the risk of the host misinterpreting the storage device's capabilities, potentially leading to mount failures or path instability.
NEW QUESTION # 24
An administrator is setting up FA File using the FlashArray GUI. The company is an NFS only shop and needs to configure their remote user authentication.
Which of the following GUI locations should the administrator use to configure access?
Answer: A
Explanation:
For FlashArray File Services (FA File), user authentication and mapping depend on the storage protocol being used. In an NFS-only environment, remote user authentication (resolving UNIX UIDs and GIDs to actual usernames and managing access) is typically handled via LDAP or NIS.
To configure this integration in the Purity GUI, the storage administrator must navigate to Settings > Access > Directory Services. This specific section allows the FlashArray to connect to a centralized directory server (such as OpenLDAP or even Active Directory providing LDAP services) to pull the necessary UNIX user and group attributes required for NFS file permissions to function properly.
Here is why the other options are incorrect:
Settings > Access > Create Active Directory Account (A): This specific menu path is used strictly for configuring native Active Directory (AD) computer accounts and joining the domain to support the SMB (Server Message Block) protocol. Since the scenario explicitly states the company is an "NFS only shop," configuring an SMB AD account is not the correct step.
Settings > Access > File System (C): While you manage file-level exports and policies within the Purity file interface, the global configuration for remote user authentication and directory server integration lives under the dedicated Directory Services pane.
NEW QUESTION # 25
What is the proper procedure for stopping asynchronous replication and in-progress transfers?
Answer: A
Explanation:
According to the official Pure Storage FlashArray Asynchronous Replication Configuration and Best Practices Guide, the proper and immediate method to halt an active, in-progress asynchronous replication transfer is by disallowing the protection group at the target.
When you navigate to the target FlashArray and disallow the specific Protection Group, Purity immediately breaks the replication authorization for that group. If there is an in-progress snapshot transfer occurring at that exact moment, the transfer is immediately stopped, and the partially transferred snapshot data is discarded on the target side.
Here is why the other options are incorrect:
Disabling the replication schedule (B): Toggling the replication schedule to "Disabled" only prevents future scheduled snapshots from being created and sent. It does not kill or interrupt a replication transfer that is already currently in progress.
Removing the volume member from a protection group (A): Modifying the members of a protection group updates the configuration for the next snapshot cycle. It does not actively abort the transmission of the current point-in-time snapshot that the array is already busy sending over the WAN.
NEW QUESTION # 26
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