Introduction In our Faculty, different types of data storage are offered: Storage class Description Risk for data loss Home directories Small (several GB), reliable, backed up storage for individuals low Network shares Larger (1-200 TB), reliable, backed up storage for individuals or groups low Local storage Not backed up storage on desktop computers and cluster nodes, likely to be lost in case of a hardware problem or when the machine gets reinstalled high Home directories Your Science login comes with a home directory of 5GB at no costs. This is a safe place to store your work related documents. Home directories are stored on reliable hardware and backed up automatically. If you need more than 5GB of storage, you can enlarge it on DIY. Before doing so, you may want to clean up some data. ...

The DIY website that C&CZ maintains allows people to control certain properties of their science account and change/view their used services. The pages here contain extra documentation for certain features. We strive to keep DIY intuitive and lean. Some things might require more explanation, instead of trying to fit this into the DIY site itself, we explain those here. We maintain a glossary to document features on the DIY website. Warning ...

Science login A Science login provides faculty students and employees access to services like networked storage, computer labs, JupyterHub, clusternodes and GitLab & Mattermost. A Science login usually resembles your name and does not contain periods, capital letters or an at sign (@). For example johndoe. All settings related to your Science login, like setting your password, MFA, storage, groups and email aliases can be managed in DIY. See the DIY article for more information. For Students & Employees To create your Science login: ...

Tip ...

Computer cluster architecture The clusternodes that we manage for the various departments are all connected to the network, but not all are in the same subnet/vlan. We strive to keep the nodes of a single group in the same vlan to optimise internal network traffic. Connectivity with the storage servers for shares and homedirectories is always routed through the firewall, thus it is less performant than a local server and much less performant than local (within the server) storage on /scratch. ...

At the faculty of science, C&CZ manages a number of compute clusters and we have our own computer room with a few dozen racks for server hardware and also some racks in the Forum computer room. Managed clusters The largest cn-cluster is heterogeneous: it holds nodes purchased by individual departments as well as a number of nodes purchased by C&CZ, which FNWI departments may use after approval. The cn-cluster includes nodes with a GPU with CUDA cores. All nodes use SLURM as cluster software; regular maintenance is performed according to the Compute Cluster Maintenance policy. ...

JupyterHub is a multi-user Hub that spawns, manages, and proxies multiple instances of the single-user Jupyter notebook server. It can offer notebook servers to a class of students, a scientific research project, or a high-performance computing group. Please contact C&CZ if you plan to use or are interested in using the JupyterHub for your course or project. Login The JupyterHub is available via https://jupyterhub22.science.ru.nl and you can login with your Science username / password combination. ...

NBGrader is a system for assigning and grading Jupyter notebooks. Student Interface Using the assignment list extension within the JupyterHub, students may conveniently view, fetch, submit, and validate their assignments. For details see: https://nbgrader.readthedocs.io/en/stable/user_guide/highlights.html#student-interface Instructor Interface The NBGrader services guide the instructor and teaching assistants through assignment and grading tasks using the familiar JupyterHub environment. For details see: https://nbgrader.readthedocs.io/en/stable/user_guide/highlights.html#instructor-interface

Introduction In our Faculty, different types of data storage are offered: Storage class Description Risk for data loss Home directories Small (several GB), reliable, backed up storage for individuals low Network shares Larger (1-200 TB), reliable, backed up storage for individuals or groups low Local storage Not backed up storage on desktop computers and cluster nodes, likely to be lost in case of a hardware problem or when the machine gets reinstalled high Home directories Your Science login comes with a home directory of 5GB at no costs. This is a safe place to store your work related documents. Home directories are stored on reliable hardware and backed up automatically. If you need more than 5GB of storage, you can enlarge it on DIY. Before doing so, you may want to clean up some data. ...

A new storage option has been developed by C&CZ. This page will show the technical details and properties of this storage, which will hopefully help you make a decision if this is something you want. Any storage we handout we call a “volume”. For these ZFS volumes: Size Storage size can be as large as you want, but smaller than the amount we can put in a single machine. Currently (2024+) we can buy machines with roughly 140-200 TB storage. Snapshots On this we enable snapshots, so that you can retrieve (deleted) files your self. Backup Each volume will be back upped to local S3 storage. This should be thought of as disaster recovery, and restoring from the cloud should (hopefully) be rarely needed. All of these volumes are visible in DIY in the “Storage” section if you have access to them. How to order such storage can be seen here. ...

Often people want to share data, choosing the right method can be complex. This page hopes to help you choose the right solution. Options: https (previously ftp) e-mail surfdrive surf filesender physical transfer custom solution Microsoft Teams Situations: one to few people one to many people share with public co-authoring moving datasets between institutions GDPR (Dutch: AVG) Whenever you are sharing documents or files, be aware that restrictions apply when sharing personal information and all involved parties must explicitly accept responsibility for keeping within the legal boundaries. ...

What path to mount? The storage page describes the paths for your home directory and network shares. Once you know what network share to mount, follow the steps for your operating system below. Info ...

You were just given an Uncloud cluster. Now what? This howto explains what Uncloud is, why we think its needed and some pointers other documentation. At the end you’ll find a FAQ like section. We very much want Uncloud to profit from our use, so our intention is to upstream as much documentation as possible. Also see my personal journey with Uncloud; those articles are also in the process of being integrated with the Uncloud documentation. ...

This document gives a short description which decisions have to be made before creating a new web site. C&CZ is not the communications department, officially all communication and therefore web sites should be provided and endorsed by the communication department. However, sometimes a web site is actually an application with a web interface and this can usually not be provided via the official communication website. Preferably a site with a URL like https://<somesite>.science.ru.nl is used, but if necessary, we can request an additional domain under whatever toplevel you need. Be aware that this is most likely against the official policy regarding websites. ...

Phishing Trying to acquire useful data, ie login credentials, for abusing someone else’s ICT infrastructure. Methods of phishing In general, phishing works by send a clickable link surrounded by an important message about Salary, payment or a prize, a punishment or fee. This distracts your rational mind and ensures your emotional response controls your mouse-clicking finger. Tip ...

Tip ...

Email codes overview ALICE-1 This is an email in which students are requested to participate in the digital course evaluation. Recipients? All students that are registered in OSIRIS for the exam of the corresponding course. When? Typically on the day of the exam (around 17:00). ALICE-2 This is an email reminder in which students are requested once again to participate in the digital course evaluation. Recipients? All students that are registered in OSIRIS for the exam of the corresponding course. When? Five days after the ALICE-1 email, so typically five days after the exam. ALICE-3 This is an email in which the feedback of the course are sent to the students. ...

Mozilla Thunderbird is free and open-source email client software. Below are instructions to configure Thunderbird for RU MS365 mail and for Science mail. Configure Thunderbird for RU MS365 mail. The RU MS365 instructions do not mention Thunderbird, but there is a RU created set of instructions (pictures in Dutch). Configure Thunderbird for Science mail. NB: For a self managed pc after installing Thunderbird you’ll have to uncheck Launch Mozilla Thunderbird now and click Finish. Last installation dialog screen ...