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How can I see which data is migrated?

There are two file systems which hold migrated data: /arch and /arch2

  • These are so called archive file systems.
  • In principle all data in the file systems will be migrated to TSM-HSM tape storage in tape libraries.
  • Data is copied to TSM backup storage prior to migration.
  • Every user owns a personal archive directory that can be specified by the $ARCH variable.
  • Data are not quoted by storage but by the number of files per group/project. This is done because UNIX is still not able to handle millions of files in a file system with an acceptable performance.

The TSM-HSM native command dsmls, which shows if a file is migrated, is not available on any HPC system (e.g. JUQUEEN, JURECA, DEEP, JUROPA3 partitions) nor on the Data Access System (JUDAC). This command is only supported on the TSM-HSM node of the JUST storage cluster, that hosts the file systems for the HPC systems. However JUST is not open for user access.

Please use

ls -ls [mask | filename]

to list the files. Migrated files can be identified by a block count of 0 in the first column (-s option) and an arbitrary number of bytes in the sixth column (-l option).

0 -rw-r----- 1 user group 513307 Jan 22 2008 log1
0 -rw-r----- 1 user group 114 Jan 22 2008 log2
0 -rw-r----- 1 user group 273 Jan 22 2008 log3
0 -rw-r----- 1 user group 22893504 Jan 23 2008 log4