ToH Example 3
Imagine the backup plan has the following tape options:
The figure shows tape rotation for the ToH scheme with these options.
Maximal number of tapes used in the rotation is seven that is more than in classical five-level ToH scheme.
Two additional tapes used for:
The example demonstrates that the tapes’ usage efficiency is reduced. Moreover, the data recovery requires access to the backups kept on one (full backups, 6%), two (differential backups, 44%) or three (incremental backups, 50%) tapes. So on average the operation takes more time than in the previous examples.