The RAL Tier1 is just about to migrate all the tape backed data that we store for the ATLAS collaboration onto larger tapes ( well the tapes are the same size but the amount per tape which can be written with new drives is higher. Before we started; we asked ATLAS if they could find any data to delete before we migrate ( so a not to put gaps in to the new tapes.)
This they did successfully.
They deleted 1.58 million files; (corresponding to 1.48 PB of data,) over a 5 day period this can be seen in the following plots, (deletion rate when busy of 20k files per hour):
Now to just get ATLAS to delete the remaining logfiles from DATADISK... (requires moving to using our new CEPH storage system for this to happen...)....
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