Skip to content

FAQ

Passwords

  1. How can I change my temporary password?

    You need to connect to the login nodes. This will :

    • allow you to change the temporary password,

    • automatically create your home directory (which is required before being able to log on the Open OnDemand portal).

    You can change the temporary password through ssp.lucia.cenaero.be but that won't create you home directory.

  2. The temporary password works only for logging into the support system.

    You need to change the temporary password → 1. How can I change the temporary password?.

  3. I cannot log on to the Open OnDemand web portal.

    You need to change the temporary password → 1. How can I change the temporary password?.

  4. I forgot my password, how can I reset it ?

    You can reset your password following the password reset procedure.

Disk Quota exceeded

  1. Why do I get a "Disk quota exceeded" error when creating / copying files?

    This error often occurs when the parent directory's setgid bit is missing, causing new files to inherit a group without allocated quota. For non-project Unix groups (user group for example), quotas on /gpfs/projects and /gpfs/scratch filesets are minimal (16KB and 1 file).

    Solutions:

  2. What should I do if the setgid bit is missing on a directory?

    Use the chmod command to restore the setgid bit. 

    # set the setgid bit on directory 'project01'
> chmod g+s project01

    You can automate this process on multiple directories with the find command: 

    # replace <myusername> with your username
> find /path/to/project -type d -user myusername ! -perm -g=s -exec chmod g+s {} \;

  3. How can I preserve the setgid bit when copying or moving directories?

    Commands like mv or scp preserve the original permissions and ownership, bypassing the setgid rules of the destination directory.

    Solutions:

    • Instead of mv use cp (without -p to avoid preserving permissions).

    • Instead of scp use rsync with --no-p (turns off the preserve permissions), --no-g (turns off the preserve group) and --chmod=ug=rwX (ensures that all non-masked bits get enabled): 

      > rsync -av --progress --no-p --no-g --chmod=ug=rwX <src> <dest>

  4. How can I fix incorrect group ownership on existing files or directories?

    Use the `chown`` command to change group ownership of existing file / directories. 

    # set group ownership to 'project01' for file 'toto'
> chown :project01 toto

    Use the find command to identify files or directories with incorrect group ownership and correct them:

    # replace <myusername> with your username
# replace <project01> with the correct group name
> find /path/to/project -user myusername ! -group project01 -exec chgrp project01 {} \;

  5. How can I temporarily work under a specific group for file creation?

    Use the newgrp command to switch to the desired group temporarily:

    > newgrp project01

    This ensures new files and directories inherit the active group's ownership. Use id to verify:

    > id
uid=xxxx(user) gid=xxxx(project01) groups=xxxx(project01),xxxx(user)

  6. How can I prevent group members from unintentionally modifying files in a setgid directory?

    Restrict group write access with:

    > chmod g-w <file>

    Alternatively, set a restrictive umask to control default permissions for new files.

Slurm

  1. Is it possible to increase the max time limit for my job?

    Lucia, pretty much like NIC5 and Lemaitre4, is mainly suited for large MPI jobs, hence the short timelimit that favors job rotation. You should either consider using checkpoint/restart if your code allows it, or run on a better suited system, see https://www.ceci-hpc.be/clusters.html