BwUniCluster2.0/File System Migration Guide
This page describes changes on the file systems between bwUniCluster 1 and bwUniCluster 2.0.
1 Lustre file systems
With bwUniCluster 2.0 new file systems for $HOME and workspaces have been purchased. The user data of the corresponding old file systems has been copied by KIT/SCC to these new file systems. The content of $WORK has to be migrated manually by the users to workspaces during the next 4 weeks, for details see below.
1.1 What has changed on $HOME and workspace directories?
You should see the same data as before but if this is not true - which is possible in rare cases since the data of expired users has been cleaned up - please contact the hotline or open a ticket. The virtual path to $HOME (/home/ORG/GROUP/USER) is still the same (except for University of Stuttgart users, see below) but the physical path (which can be seen by /bin/pwd) has changed. If one of yours scripts includes a physical path (wich is not recommended) you should modify these scripts. If applications complain about the old physical path (which started with /pfs/data1/ or /pfs/data2/) you should modify or recompile the application.
1.2 Hints for migration of $WORK data
Workspaces should be used instead of $WORK. Advantages of workspaces are a clear deletion policy and the ability to restore data from expired workspaces for few weeks. The old $WORK will be mounted in read-only mode for 4 weeks. If data on $WORK is still needed it has to be migrated by the users. Example for the migration to a workspace:
# create a new workspace $ ws_allocate newwork # define environment variable for old WORK OLDWORK=$WORK # define environment variable for workspace WORK=$(ws_find newwork) # Copy the data with rsync rsync -a -A $OLDWORK/ $WORK/
Of course, if only a part of your old $WORK is needed you should only copy that part. As shown above you can redefine the WORK environment variable. For example, such a definition could be added to old scripts and then no further change on the script should be required.
