Dell EMC Exam D-PSC-MN-01 Topic 1 Question 4 Discussion

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:

bash

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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:

arduino

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# isi status

List All Devices:

arduino

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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.