Helix/Migration Guide

Here we list important changes on bwForCluster Helix compared to the previous system bwForCluster MLS&WISO.

1 Rechenvorhaben

Compute projects ("Rechenvorhaben") that were approved for bwForCluster MLS&WISO (Production) are also valid for bwForCluster Helix.

2 Data access during migration phase

• $HOME: You start with a fresh home directory on bwForCluster Helix. Your home directory from bwForCluster MLS&WISO is available on the login nodes under /mnt/mls_home/ (read-only). Please copy what you need.
• Workspaces: The workspaces are shared on both systems and can be used on both systems (read and write !!!). The migration of data happens automatically in the background. No action is required on the part of the user.

3 CPU Manufacturer

The CPU manufacturer has changed from Intel to AMD. All compute nodes are now equipped with the same AMD processors. It is recommend that you newly compile your applications.

4 Software Modules

• Basic and most used software modules are already available. More will come. For special requests please submit a support ticket.
• MPI modules are now provided in a hierarchical manner. That means:
  • You need to load a compiler module first to see suitable MPI modules with 'module avail' and to load MPI modules.
  • 'module spider' shows all available MPI modules.
• Singularity is now available as system command.

5 Batch System

Partitions:

• The 'single' partition now contains all node types, including GPU nodes.
• The partition for multi-node CPU jobs is now named 'cpu-multi'.

6 Access to SDS@hd

You can access your storage space on SDS@hd directly in /mnt/sds-hd/ on all login and compute nodes. Kerberos tickets are no longer needed.