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How can I recall migrated data?

Normally migrated files are automatically recalled from TSM-HSM tape storage when the file is accessed on the login nodes of the HPC systems (e.g. JUWELS, JURECA, ...) or the Data Access System (JUDAC).

For an explicit recall the native TSM-HSM command dsmrecall is not available. Please use

tail <filename>
head <filename>

to start the recall process. These commands will not change any file attribute and the migrated version of the file as well as the backup version stay valid.

It is strongly recommended NOT to use

touch <filename>

because this changes the timestamp of the file, so a new backup copy must be created and the file has to be migrated again. These are two additional processes that waste compute resources, if the file is used read only by further processing.