Quantum DXi8500, User Manual

Page: 465 / 520

Chapter 10: DXi8500 Utilities
Space Reclamation
Quantum DXi8500 User’s Guide 435
Space Reclamation
The Space Reclamation page allows you to manage space reclamation
activity on the DXi8500. You can start or stop space reclamation. You
can also monitor the progress of space reclamation activity.
During space reclamation, the DXi8500 searches the blockpool for tags
that are no longer referenced and then deletes the unneeded tags to
free up space.
Caution: For correct system operation, space reclamation must be
run at regular intervals (at least once a week). Quantum
recommends creating a schedule to automatically run
space reclamation (see Scheduling Space Reclamation on
page 362). Because space reclamation can affect system
performance, avoid running space reclamation during
known backup periods.
The space reclamation process can include up to four stages (see Space
Reclamation Status on page 437).
• New or Normal Mode - To increase performance, when space
reclamation is initiated on the
Space Reclamation
page or as a
scheduled event, only Stage 2 (Calculating Deletion Candidates) and
Stage 3 (Deleting New Candidates) are run.
Note: Stage 1 and 4 are not required in Normal mode because
the DXi can automatically compact reclaimable space as
needed and use it to store new deduplicated data.
• Low Space or Legacy Mode - When disk capacity is low, space
reclamation is automatically started to free up disk space. In this
case, all four stages of space reclamation are run.
To access the Space Reclamation page, click the Utilities menu, and
then click the Space Reclamation tab (see Figure 245 ).