Alternate storage

When the free disk space in the circular storage location goes below the defined threshold, the circular directory exceeds the specified maximum size, or the blocks reach a certain age, the Storage subsystem will start moving the oldest history blocks to the alternate location, if configured.

History blocks in the alternate storage location are managed in the same way as the blocks in the circular storage location. However, blocks will not be deleted based on age until the sum of the specified ages for both the circular and alternate storage has passed. For example, if circular is set to 60 days, and alternate is set to 90 days, a block is deleted after 150 days.

If the alternate storage location reaches its deletion threshold limit, or configured maximum size, or age, the oldest history blocks are deleted.

A physical drive is strongly recommended, and cannot be the same drive used for circular storage. This storage location is optional.