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Informatics Computing Centre

Photo: UHH/Denstorf

Dept. of Informatics

Working with Linux

For basic usage simply log on one blade of the cluster. Should you plan intensive processes (long time computing) please contact the Informatik-RZ as is may be necessary to prearrange resources or maintenance works.

Patches are installed Mondays 7:00 AM - 1:00 PM. Please expect reboots during for period.

Logon

Login usually occurs over SSH-Shell. Start for your job in Linux with a terminal window (xterm) and in Windows with Putty or Cygwin. Without direct access to the department's network 134.100.9.0/24 tunnel through rzssh1.informatik.uni-hamburg.de:

$ ssh myuser@rzssh1.informatik.uni-hamburg.de

Inside the department's network log on (similar to the departzment's linux pool) with your account, e.g.:

$ ssh myuser@ccblade5

Select a blade

Check the page Auslastung und Reservierung der ccblades for utilisation of and reservations for the blades. Alternatively log on to a blade and check with e.g. htop, orwho if the machine is busy by other users. If necessary distribute your jobs over several blades.

Data Storage

Your network HOME directory will be automatically mounted via NFS. Unfortunately, your programs would become extreme slow if they are reading and writing constantly via NFS in your HOME directory. Therefore local storage is available under /export/scratch (and /export/scratch2 on ccblade10-12). Please create a subfolder with the username of your account and store all temporary there.

Arrange special demands, if needed, directly with the Informatik-RZ. On some blades other disk drives can be mounted with fiber channel, e.g. , for databases.

Local data in /export/scratch are not backed up, though. They are cleand up occasionally by the Informatik-RZ. Therefore, after your program runs are finished you should move the results on to your network HOME or your work group's project directoriy.

Software

For better performance a virtualization was renounced and not all services were activated. Beside the linuxpool software  Matlab, Povray , and neuronal network software like Tensorflow are available. The Informatik-RZ will add missing software and functionality if needd. Please contact with suggestions early.