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Table of Contents

I have an account, now what?

Congrats on getting an HCC account! Now you need to connect to a Holland cluster. To do this, we use an SSH connection. SSH stands for Secure Shell, and it allows you to securely connect to a remote computer and operate it just like you would a personal machine.

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How do I change my password?

Info

All passwords must be at least 8 characters in length and must contain at least one capital letter and one numeric digit. Passwords also cannot contain any dictionary words. If you need help picking a good password, consider using a (secure!) password generator such as this one provided by Random.org

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For additional information, check out the documentation on How to change your password.

I just deleted some files and didn't mean to! Can I get them back?

That depends. Where were the files you deleted?

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Unfortunately, the $WORK directories are created as a short term place to hold job files. This storage was designed to be quickly and easily accessed by our worker nodes and as such is not conducive to backups. Any irreplaceable files should be backed up in a secondary location, such as Attic, the cloud, or on your personal machine. For more information on how to prevent file loss, check out Don't Let This Happen To You: Preventing File Loss.

How do I (re)activate Duo?

If you have not activated Duo before:

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Email us at hcc-support@unl.edu from the email address your account is registered under and we will send you a new link that you can use to activate Duo.

How many nodes/memory/time should I request?

Short answer: We don’t know.

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For more information on how to determine how many resources a completed job used, check out the documentation on Monitoring Jobs.

I am trying to run a job but nothing happens?

Where are you trying to run the job from? You can check this by typing the command `pwd` into the terminal.

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Contact us at hcc-support@unl.edu with your login, the name of the cluster you are running on, and the full path to your submit script and we will be happy to help solve the issue.

I keep getting the error "slurmstepd: error: Exceeded step memory limit at some point." What does this mean and how do I fix it?

This error occurs when the job you are running uses more memory than was requested in your submit script.

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If you continue to run into issues, please contact us at hcc-support@unl.edu for additional assistance.

I want to talk to a human about my problem. Can I do that?

Of course! We have an open door policy and invite you to stop by either of our offices anytime Monday through Friday between 9 am and 5 pm. One of the HCC staff would be happy to help you with whatever problem or question you have.  Alternatively, you can drop one of us a line and we'll arrange a time to meet (http://hcc.unl.edu/contact-us).