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質問 # 54
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?
正解：A
解説：
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.
質問 # 55
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：B
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 # 56
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?
正解：B
解説：
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.
質問 # 57
What is the purpose of a Protocol Endpoint volume?
正解：C
解説：
In a VMware vSphere environment utilizing Virtual Volumes (vVols), a Protocol Endpoint (PE) acts as a crucial logical proxy or I/O access point between the ESXi hosts and the storage array.
Unlike traditional VMFS datastores where the host mounts a massive LUN and places all VM files inside it, vVols map individual virtual machine disks directly to native volumes on the FlashArray. Because a single ESXi host could potentially need to communicate with thousands of individual vVol volumes, it would be extremely inefficient to map every single one directly to the host. Instead, the ESXi host mounts the Protocol Endpoint, and the storage array uses this PE to dynamically route the I/O to the correct underlying vVol. On a Pure Storage FlashArray, creating and connecting a PE volume to your ESXi host groups is a mandatory prerequisite for setting up a vVol datastore.
Here is why the other options are incorrect:
It allows for volumes of the same name within host groups (A): Purity OS requires all volume names across the entire FlashArray to be completely unique, regardless of which host group they are connected to or whether a Protocol Endpoint is in use.
It is required to set Host Protocol (C): The host communication protocol (such as iSCSI, Fibre Channel, or NVMe-oF) is determined by the physical host bus adapters (HBAs), network interface cards (NICs), and the configuration of the Host object in Purity, not by the creation of a volume type like a PE.
質問 # 58
A network admin is trying to setup Pure1 access and phone home logging on the array.
What port should the admin ensure is opened for the array?
正解：C
解説：
Pure1 and Phone Home: Pure1 is a cloud-based management and monitoring platform. For the FlashArray to communicate its health data, performance metrics, and alerts to Pure Storage, it must be able to "Phone Home." The Power of HTTPS: This communication is encrypted and sent via the HTTPS protocol. Consequently, the standard port for HTTPS, TCP 443, must be opened for outbound traffic on the management network.
Firewall Configuration: The array controllers initiate an outbound connection to the Pure Storage cloud (specifically to destinations like cloud-connect.purestorage.com). Because it is an outbound-initiated connection, most stateful firewalls will allow the return traffic automatically once port 443 is permitted.
Why Option A is incorrect: Port 22 (SSH) is used for secure shell access to the array's CLI. While essential for local administration, it is not used for the automated Phone Home or Pure1 telemetry data stream.
Why Option B is incorrect: Port 8117 was historically used for the "Remote Assist" tunnel in older Purity versions. However, even for Remote Assist, modern Purity versions have transitioned to using port 443 to simplify firewall rules for customers. It is not the standard port for the general Phone Home/Pure1 logging service.
Verification: An administrator can verify connectivity by running the purearray test phonehome command in the CLI. If port 443 is blocked, the test will fail with a connection timeout.
質問 # 59
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