To allow a SMS managed data set to be archived to disk (L1) by CA Disk after 3 days non-usage and then be eligible for MERGE from disk to tape (L2) after another 4 days, you need to set the following SMS migration attributes in its SMS MC:
Primary Days Non-usage . : 3
Level 1 Days Date/Days . : 7
Please note that "Level 1 Days Non-usage" is not added to "Primary Days non-usage.
Instead, "Level 1 Days Date/Days" indicates the number of days that must elapse since the last reference on level 0 (L0) before a data set on L1 can be migrated/archived/merged further to L2.