D-PSC-MN-01 Dell PowerScale Maintenance Version 2 Practice Questions
Prepare for D-PSC-MN-01 with more than an answer.
- Level
- Skills-based
- Valid for
- Does not expire once achieved
Domains covered on the exam 4
- PowerScale Hardware Concepts25%
- PowerScale Hardware Maintenance25%
- PowerScale Hardware Installation25%
- PowerScale Implementation25%
- 1
Company Background:
Global Media Inc. (GMI) operates a large PowerScale environment for its video-on-demand platform. Their primary cluster consists of 20 F-series All-Flash nodes for high-performance transcoding and a separate 30-node A-series Archive cluster for long-term media preservation. Both clusters are approaching 85% capacity utilization.Current Situation:
GMI has acquired a new content library and must add significant capacity and performance for a new 4K streaming service. The new workload requires a balance of high-capacity storage for large video files and high-throughput performance to serve multiple concurrent streams, but it does not require the extreme low latency of the all-flash transcoding tier. The existing data center has rack space and power, but the network team has mandated that any new nodes must connect to a new 100GbE network fabric, whereas the existing clusters use 40GbE.Requirements:
- Add at least 5 Petabytes of usable capacity.
- Provide high sequential read throughput for streaming.
- Integrate the new nodes into the existing PowerScale management domain.
- Connect the new nodes to the new 100GbE network fabric.
- The solution must be cost-effective, avoiding the expense of all-flash for this specific workload.
Which solution best meets all of GMI's requirements?
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Correct answer: C
This is the optimal solution. H-series nodes provide the required balance of capacity and performance for streaming. Adding them to the existing primary cluster leverages the single management domain. Creating a new node pool isolates them for the specific workload, and configuring a new subnet/IP pool allows them to connect to the 100GbE fabric while coexisting in the same cluster with the 40GbE nodes. A dedicated SmartConnect zone directs the streaming application traffic to the correct nodes.
- 2
A PowerScale cluster is designed with a physically separate and redundant backend network. What is the primary purpose of this dedicated backend network?
graph TD subgraph "Client-Facing Network (Frontend)" direction LR FSW1[Frontend Switch 1] FSW2[Frontend Switch 2] end subgraph "PowerScale Cluster" direction TB Node1 -- Frontend Port 1 --> FSW1 Node1 -- Frontend Port 2 --> FSW2 Node2 -- Frontend Port 1 --> FSW1 Node2 -- Frontend Port 2 --> FSW2 Node3 -- Frontend Port 1 --> FSW1 Node3 -- Frontend Port 2 --> FSW2 Node1 -- Backend Port 1 --> BSW1 Node1 -- Backend Port 2 --> BSW2 Node2 -- Backend Port 1 --> BSW1 Node2 -- Backend Port 2 --> BSW2 Node3 -- Backend Port 1 --> BSW1 Node3 -- Backend Port 2 --> BSW2 end subgraph "Internal Network (Backend)" direction LR BSW1[Backend Switch 1] BSW2[Backend Switch 2] end Clients((Clients)) --> FSW1 Clients((Clients)) --> FSW2Show answer details
Correct answer: B
The dedicated backend network is crucial for the performance and stability of the OneFS distributed file system. It carries all internode traffic, including data layout, protection/rebuild operations, and cache coherency messages. Isolating this traffic from the frontend (client) network ensures that heavy client load does not impact the cluster's internal operations and vice-versa, guaranteeing predictable performance and resilience.
- 3
A new PowerScale node has been physically racked and cabled. An engineer connects to the serial console to perform the initial configuration. The cluster setup wizard prompts for the type of cluster to create or join. Which of the following is NOT a valid cluster creation option presented during this initial setup process?
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Correct answer: C
During the initial text-based configuration wizard, the options are to create a new standard cluster or join an existing one. While a cluster can be put into compliance mode, this is a post-creation step performed using the
isi compliancecommand. It is not an option presented at the initial moment of cluster formation in the setup wizard. - 4
A technician is dispatched to a remote data center to replace a failed M.2 boot drive in a PowerScale F600 node, which is a Customer Replaceable Unit (CRU). After physically swapping the drive, the technician boots the node. The node fails to join the cluster, and the front panel LCD displays a 'Configuration Mismatch' error. What is the most likely cause of this issue and the required next step?
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Correct answer: B
Replacing a boot drive (CRU) requires more than just a physical swap. The new drive is unconfigured and does not contain the OneFS operating system or the node's specific configuration. The correct procedure is to reimage the node using a USB drive prepared with the appropriate OneFS installation image. This process installs the OS and allows the node to rejoin the cluster and sync its configuration.
- 5
An engineer is attempting to add a used PowerScale H500 node, previously part of a decommissioned lab cluster, into a new production cluster running a different version of OneFS. The standard 'Join an existing cluster' process fails repeatedly. The engineer has confirmed full network connectivity between the new node and the production cluster's backend network. Which procedure is required to successfully integrate this node?
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Correct answer: C
When a node has been part of a previous cluster, it retains that cluster's identity, configuration, and OneFS version. A simple reformat is often insufficient, especially when moving between OneFS versions. The correct and most reliable procedure is to reimage the node. This process completely erases the boot and journal drives, installing a fresh copy of the desired OneFS version and removing all traces of the old cluster's identity, allowing it to join the new cluster as if it were a new node.
- 6
A maintenance engineer has just replaced a faulty Power Supply Unit (PSU), a Field Replaceable Unit (FRU), in a PowerScale Gen 6.5 F600 node. After powering the node back on, the OneFS WebUI continues to display a critical hardware alert for the same PSU slot. The node's amber fault LED remains illuminated. The engineer has already reseated the new PSU and confirmed power is being supplied from the PDU. Which command should the engineer run next via an SSH session to the node to gather detailed fault data and determine if the issue is with the new PSU, the slot, or the midplane?
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Correct answer: C
The
isi_hw_statuscommand provides a detailed, real-time report of the hardware components and their status, including sensors, fans, and power supplies. It polls the hardware directly and can help differentiate between a faulty replacement part and a more serious issue with the node's midplane or the PSU slot itself.isi status -vgives general cluster status but lacks the granular hardware detail needed here.isi_radish -qis for checking the RAD (Rapid Array of Disks) service.isi event events listshows the cluster-wide event log, which would show the fault but not provide the live diagnostic data needed to troubleshoot the component. - 7
An administrator is planning a rolling upgrade of a large, mixed-generation PowerScale cluster from OneFS 9.4 to 9.8. The cluster contains both Gen 6 and newer Gen 6.5 nodes. To minimize risk and ensure a smooth upgrade process, which THREE of the following actions are mandatory pre-upgrade validation steps? (Select THREE)
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Correct answer: A, B, E
Running the On-Cluster Analysis tool (or Upgrade Compatibility Check) is a critical step that assesses the cluster's health and readiness for an upgrade, identifying potential issues that could cause complications.
The Supportability and Compatibility Guide is essential for identifying required firmware versions for node components (like NICs and disk controllers) that must be updated before the OneFS upgrade to prevent incompatibility issues.
Proper DNS resolution for all nodes is a fundamental requirement for cluster communication and is checked by the pre-upgrade validation tools. A failure in DNS can halt the upgrade process.
- 8
A financial services firm is deploying a new 10-node PowerScale H7000 hybrid cluster in a high-density data center. The deployment is managed by a third-party contractor, and your role is to perform the final validation before the installation team proceeds with racking and cabling the equipment, which has just arrived on site.
The contractor provides you with a completed Product Evaluation Questionnaire (PEQ) and a set of installation documents generated by the SolVe Desktop tool. The PEQ indicates that the data center has specific, non-standard power distribution, using 208V 30A circuits with L6-30R receptacles. The data center operations team has also mandated that no single rack can exceed 80% of its provisioned power budget.
Given this scenario, what is the most critical verification step you must perform before authorizing the contractor to begin the physical installation?
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Correct answer: B
This is the most critical step. The SolVe tool generates procedures based on standard inputs, but these must be validated against the specific, real-world conditions documented in the PEQ. A mismatch between the SolVe plan's assumed power infrastructure (e.g., standard PDUs) and the actual site's non-standard receptacles and power budget (L6-30R, 80% rule) could halt the entire installation or lead to unsafe conditions. Verifying this alignment ensures the fundamental site requirements for power and safety are met before any physical work begins.
- 9
A technician is adding a new PowerScale node to an existing cluster. The cluster utilizes a leaf-spine network architecture with two redundant backend switches for the node interconnect and two redundant front-end switches for client access. According to Dell's best practices for ensuring maximum availability and performance, which cabling scheme is correct for the new node?
graph TD subgraph New Node BE1[Backend Port 1] BE2[Backend Port 2] FE1[Front-End Port 1] FE2[Front-End Port 2] end subgraph Backend Network BSW1[Backend Switch 1] BSW2[Backend Switch 2] end subgraph Front-End Network FSW1[Front-End Switch 1] FSW2[Front-End Switch 2] end BE1 -->|?| BSW1 BE1 -->|?| BSW2 BE2 -->|?| BSW1 BE2 -->|?| BSW2 FE1 -->|?| FSW1 FE1 -->|?| FSW2 FE2 -->|?| FSW1 FE2 -->|?| FSW2Show answer details
Correct answer: B
This cabling scheme follows the best practice for high availability and redundancy. By connecting each backend port to a different backend switch, the node can survive the failure of an entire switch without losing its connection to the cluster's internal network. Similarly, connecting each front-end port to a different front-end switch ensures that a single switch failure does not isolate the node from client traffic. This provides full path redundancy for both critical networks.
- 10
A storage administrator has replaced a failed drive in a PowerScale F200 node. After the replacement, the drive's LED remains amber, and the drive is not recognized by OneFS. The administrator has already confirmed the drive is correctly seated and the event log shows a generic 'drive failed' event. Which command should the administrator run FIRST to gather specific hardware-level details about the drive bay and its connection status to determine if the issue is with the drive, the bay, or the backplane?
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Correct answer: D
The
isi_radish -qcommand is the correct first step for deep hardware diagnostics in this scenario. It queries the drive sled controller (radish) directly, providing low-level status about the drive, its bay, and its connection to the node's backplane. This command can reveal issues that are not yet visible in the higher-level OneFS event logs or status commands.isi eventis too generic,isi status -vprovides OneFS-level status but not deep hardware diagnostics, andisi_hw_statusgives a general overview of components but lacks the specific detail needed to diagnose a bay or sled controller issue.
