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When more disk space is needed for new archive copies, the archivist must decide which versions to delete from disk. These should not necessarily be the oldest versions, but should rather be those versions for which no further use is anticipated. The archive disks contain sufficient space for four full versions plus many partial versions, so there should be no need to delete a version which will still be needed.
Particular care should be taken before deleting full versions, since restoring these to non-SLAC hosts requires shipping tapes (full versions are too large to ship over the network).
The implementation of ducs_arch delete is as follows: