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The latest Lustre documentation is available at Lustre

Distributed filesystems such as Lustre are ideal for HPC and HTC environments. In these environments the typical workload consists of large files that have to be accessed from many compute nodes with very high bandwidth and/or low latency. Therefore these file...

Public login services Access to the CNCA clusters is only available to registered users. To use the HPC services users need to login via SSH into a front-end server. The login servers can be customized according to the user requirements (OS, Hardware resource...

Access to the CNCA computing clusters is performed via SSH and requires the use of SSH keys for authentication. Authentication with passwords is not supported. Each SSH key pair has two components a public key that must be added to the hosts to be remotely acc...

Choose strong passwords - at least 9 characters long, a mixture of alphanumeric mixed case and symbol characters. The password should be completely different from the password you use on any other system. Never use the same password across different systems ...

In order to simplify SSH access to remote hosts we recommend CNCA users to adopt the following recommendatios and configuration defaults. Enabling SSH agents and X11 forwarding Activate the forwarding of both SSH authentication credentials and X11 graphical wi...

CNCA is open to all academic and scientific researchers and institutions. In order to use our services please go to the CNCA portal and follow the instructions there. For guidance and further information about the access conditions see the FAQ List warning Pl...

Access to the CNCA cloud and distributed computing infrastructure is available only to registered users. Access to login machines may be filtered by IP address of origin. During the registration process you may be asked to provide your IP address in order to ...

At Cirrus the default max elapsed time for the queues is 72h. The values for all queues can be consulted here In case you cannot parallelize your job (split one single job into multiple parallel jobs) you can use job dependencies. In this case you create ...

To contact the CNCA user support please send email to: helpdesk (at) acnca.pt For other institutional contacts see: contacts web page

The Cirrus filesystems are based on the Lustre shared filesystem which is mounted in the compute nodes and in the submission/login nodes. Lustre is mostly suited to the storage of large/huge files. Summary CNCA-Lisbon cluster Name[1] Purpose Availability Qu...

To prevent storage misuse and problems resulting from filesystems becoming full, Cirrus has implemented the following data usage policies and limits. File system Hard Limit Exceeded /home Once quota or number of files exceeded, new files will not be all...

NOTE Please note that the Cirrus Lustre storage is not designed for small files. Attempting to store or retrieve files less than a few megabytes will result in extremely poor performance for all users. If you wish to store lots of small files to massdata, ple...

Users are allowed to change the default permissions file permissions in all folders they own. The default access rights to Cirrus filesystem is the folllowing: /home All files under /home are only accessible by the user. /data All files under /data/unixgrp/...

CNCA is open to researchers from Portuguese scientific and academic organizations in all areas of knowledge.

Researchers from foreign organizations can be eligible to use CNCA when they cooperate with Portuguese researchers in common projects, initiatives and infrastructures. The initial application form must be submitted by a researcher from a Portuguese academic o...

Please apply via the FCT Calls for Advanced Computing Projects (CPCA). FCT CPCA calls

Depends on the size and specificities of the request. If you have an FCT or European research project already approved and resources are available your request may be fast-tracked. Requests for smaller compute and storage capacities (CPCA A0/A1) are generally...

You can contact us via e-mail to the CNCA Computing Services helpdesk address: helpdesk at acnca.pt

Large requests should be backed by approved peer-reviewed research projects either national or European. Requests without a peer reviewed project will have lower priority, please fill the access request form with the maximum detail to facilitate the evaluati...