Dell EMC D-PSC-MN-01 Exam Questions

After removing the bezel from a Dell EMC PowerScale Gen 6 node, it's important to reinstall it correctly to maintain proper airflow and protect the hardware.

Steps to Replace the Bezel:

Alignment:

Align Bezel Ends with Clips:

Position the bezel in front of the node chassis.

Ensure that the ends of the bezel are aligned with the corresponding clips or slots on the chassis.

Attachment:

Press the Bezel Center:

Gently but firmly press the center of the bezel.

This action engages the clips on both ends simultaneously, securing the bezel to the chassis.

Why Option D is Correct:

Proper Technique:

Aligning the bezel ends with the clips ensures correct positioning.

Pressing the bezel center allows for even engagement of the clips, preventing misalignment or damage.

Why Other Options Are Incorrect:

Option A:

Checking for red LEDs is good practice but not directly related to bezel replacement.

Securing with thumb screws is not applicable as Gen 6 bezels typically do not use thumb screws.

Option B:

Pressing the left side and then the right side may not ensure proper alignment and could cause the bezel to be uneven.

Option C:

Pushing on the bezel ends without proper alignment may result in the clips not engaging correctly.

Dell PowerScale Reference:

Dell EMC PowerScale Hardware Installation Guide:

Section on Bezel Installation and Removal:

Provides instructions and illustrations on how to properly replace the bezel.

Emphasizes aligning the bezel and pressing the center for secure attachment.

Best Practices:

Ensure that no cables or obstructions are in the way before replacing the bezel.

Verify that the bezel is flush with the chassis after installation.

Additional Notes:

Airflow Management:

Proper bezel installation is crucial for maintaining optimal airflow and cooling within the node.

Protection:

The bezel protects internal components from dust and physical damage.

Tenant-specific administration involves managing specific zones or tenants within a Dell EMC PowerScale environment. This requires a certain level of privileges that allows administrators to control resources without having full system-wide access.

Zone Role-Based Access Control:

Definition:

Zone role-based access control allows administrators to assign permissions to users or groups for specific zones or tenants.

Functionality:

Enables delegation of administrative tasks within a particular zone without granting system-wide privileges.

Benefits:

Enhances security by limiting access.

Simplifies management in multi-tenant environments.

Why Other Options Are Incorrect:

System Root Privileges (Option B):

Root privileges grant full access to the entire system, which is not necessary for tenant-specific tasks.

System Admin Privileges (Option C):

Similar to root, system admin privileges are broader than needed.

Role-Based Access Control (Option D):

While general role-based access control is related, zone role-based access control is specifically designed for tenant administration.

Dell PowerScale Reference:

Dell EMC PowerScale OneFS Administration Guide:

Chapter on Access Control and Authentication:

Details how to implement zone role-based access control.

Provides instructions on assigning roles to users within specific zones.

Best Practices:

Regularly review and update access permissions.

Use the principle of least privilege to enhance security.

In a Dell EMC PowerScale cluster, each node is assigned a Logical Node Number (LNN) that identifies it within the cluster. When nodes are added or removed (e.g., via SmartFail), LNNs may become non-sequential. To modify the LNNs and restore sequential order, specific commands must be used.

Steps to Modify the LNN for a Node:

Enter Configuration Mode:

Use the isi config command to enter the configuration shell.

# isi config

This mode allows for administrative tasks that can alter the cluster configuration.

Use the lnset Command:

The lnset command is used to set the LNN of a node.

# lnset --sn <SNO> <new-LNN>

--sn <SNO> specifies the serial number of the node.

<new-LNN> is the desired Logical Node Number.

Example:

If you want to set the LNN of a node with serial number ABC12345 to 6:

# isi config

# lnset --sn ABC12345 6

Why Option C is Correct:

Accurate Command Sequence:

Option C correctly specifies entering isi config, followed by using lnset with the serial number (<SNO>) and the new LNN.

Proper Syntax:

The command includes all necessary parameters to change the LNN.

Why Other Options Are Incorrect:

Option A and B:

Commands isi device node and isi node with --lnn options are incorrect or incomplete for changing LNNs.

Option D:

Simply stating lnset without specifying the serial number and new LNN is insufficient.

Dell PowerScale Reference:

Dell EMC PowerScale OneFS CLI Administration Guide:

Section on Node Management Commands:

Details the usage of isi config and lnset commands.

Provides syntax and examples for changing LNNs.

Notes on LNN Changes:

Warns that changing LNNs can impact cluster operations and should be performed during maintenance windows.

Best Practices:

Before Changing LNNs:

Ensure that the cluster is in a healthy state.

Notify users of potential service impacts.

Backup critical configuration data.

During LNN Change:

Carefully input the serial number and desired LNN to avoid mistakes.

Verify that the new LNN is not already in use.

After Changing LNNs:

Exit the configuration mode with exit.

Check cluster status using isi status to confirm that the node has been assigned the new LNN.

Update any documentation to reflect the new node numbering.

Caution:

Modifying LNNs is an advanced operation that can affect cluster communication.

It is recommended to consult Dell EMC Support or refer to official documentation before proceeding.

After replacing a failed SSD in Node 1 of a Dell EMC PowerScale F200 cluster, it's important to verify that the node has recognized the new drive and has finished any necessary updates or rebuild processes.

Command to Verify Device Status:

isi devices device list --node-lnn 1:

This command lists all devices (drives) associated with Node 1.

It provides detailed information about each device, including status, health, and activity.

Why Option C is Correct:

Specific to Node 1:

The --node-lnn 1 parameter targets Node 1 directly.

Comprehensive Output:

The device list subcommand displays the status of all devices on the node.

Verification of Update Completion:

By reviewing the output, you can confirm that the new SSD is recognized and that any rebuild or update processes have completed successfully.

Why Other Options Are Less Appropriate:

Option A (isi devices -d):

This command is incomplete and may not provide the necessary information.

Option B (isi status -h):

Provides a high-level cluster status but does not detail individual device statuses.

Option D (isi status -q):

Gives a quick summary of cluster status, similar to Option B.

Dell PowerScale Reference:

Dell EMC PowerScale OneFS CLI Administration Guide:

Section on isi devices Commands:

Explains how to use isi devices device list to view detailed device information.

Provides options to filter by node, device type, and status.

Steps to Verify Drive Replacement:

Run the Command:

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# isi devices device list --node-lnn 1

Review Output:

Look for the new SSD in the list.

Check that the status is HEALTHY or OK.

Confirm Rebuild Completion:

Ensure that there are no active jobs related to data protection or rebuilds.

Use isi job status to check for running jobs.

Best Practices:

After Replacing a Drive:

Monitor the cluster for any alerts or errors.

Ensure that data protection levels are restored.

Documentation:

Record the replacement in maintenance logs.

Update any asset tracking systems with the new drive's details.

Additional Commands:

Check Cluster Health:

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# isi status

List All Devices:

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# isi devices list

By using the isi devices device list --node-lnn 1 command, the platform engineer can confidently confirm that Node 1 has recognized the new SSD and that all necessary updates have been completed.

To access the Dell EMC PowerScale cluster through the Web Administration interface, you need to use a web browser to connect to the cluster's management port using HTTPS on the appropriate port.

Correct URL Format:

https://<clustername>:8080

Protocol: HTTPS (Secure HTTP)

Cluster Name/IP: Replace <clustername> with the cluster's hostname or IP address.

Port Number: 8080, which is the default port for the PowerScale Web Administration interface.

Why Option A is Correct:

HTTPS Protocol:

Ensures secure communication with the cluster's web interface.

Port 8080:

Default port for accessing the Web Administration interface on PowerScale clusters.

Combining Both:

Using https://<clustername>:8080 directs the browser to the correct interface.

Why Other Options Are Incorrect:

Option B (http://<clustername>:80):

Uses HTTP on port 80, which is not the default for the administration interface.

Option C (http://<clustername>:8082):

Incorrect protocol and port.

Option D (https://<clustername>:8081):

Port 8081 is not the default for the web interface.

Dell PowerScale Reference:

Dell EMC PowerScale OneFS Web Administration Guide:

Accessing the Web Interface:

Specifies that the Web Administration interface is accessible via HTTPS on port 8080.

Provides the URL format for connecting to the cluster.

Example:

If your cluster's hostname is powerscale-cluster, you would enter:

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https://powerscale-cluster:8080

Security Note:

Certificate Warnings:

Browsers may display a security warning due to self-signed certificates.

You can proceed by adding an exception or install a valid SSL certificate.

Best Practices:

DNS Configuration:

Ensure that the cluster's hostname is resolvable via DNS.

Alternatively, use the cluster's IP address in the URL.

Browser Compatibility:

Use a modern browser that supports the necessary encryption protocols.

Firewall Settings:

Verify that network firewalls allow traffic on port 8080.