First steps

To start using Tycho, please follow these steps

• Get a user account by contacting a sponsor and signing up at

https://hpc.ku.dk/account.html

You have to select "Astro" as your group. Remember to sign the rules-of-conduct-form

• If you have received the old welcome e-mail without a link to this wiki, the info is not correct. You should never login to fend0X.hpc.ku.dk, but instead use the Tycho-specific frontends called astro0X.hpc.ku.dk (see Hardware for an up to date list of available frontends / Analysis hardware).

• Set up an SSH key pair for secure passwordless login (see Accessing Tycho)

• Add module load astro to you $HOME/.bashrc file to have access to all the custom installed software. You can read more about the module command.

• Consider changing umask 077 to umask 027 in $HOME/.bashrc to allow collaborators and/or your supervisor read access to your files when logged in to the cluster.

• If you are going to travel, but want to continue working on Tycho while you are travelling, you need to set up a Dynamic Firewall before traveling. You can do so by following the detailed instructions here

• You can set up e.g. Visual Studio Code for remote development for transparent editing of files on the cluster. See Visual Studio Remote Development

• Every user has a 50 GB quota for the home folder (/groups/astro/yourusername. Whenever you are going to be working with large amounts of data, considering using the /lustre/astro/yourusername directory. This scratch folder is residing on a ZFS based high performance Lustre filesystem with dedicated hardware for our group. No quotas are enforced and the total space (disregarding the transparent compression) is 1300 TB.