14.4 Space Reclamation
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14.4 Space Reclamation
The Space Reclamation page allows you to manage space reclamation activity on the
ETERNUS CS800. You can start or stop space reclamation. You can also monitor the
progress of space reclamation activity.
During space reclamation, the ETERNUS CS800 searches the blockpool for tags that are no
longer referenced and then deletes the unneeded tags to free up space.
In addition, the ETERNUS CS800 automatically compacts reclaimable space in the
following ways:
l During data ingest, reclaimable space is compacted as needed to provide space for
new, deduplicated data.
l If the ETERNUS CS800 is not in Low Space state, compaction starts when used disk
space reaches a high level and there is sufficient reclaimable space. Compaction stops
when used disk space falls below the high threshold state. The reclaimed space can be
used to store new deduplicated or non-deduplicated data.
l If the ETERNUS CS800 is in Low Space state, compaction starts and continues to run
until the ETERNUS CS800 exits Low Space state. The reclaimed space can be used to
store new deduplicated or non-deduplicated data.
The current compaction status is displayed on the Home page (see "Home Page"
on page 174).
CAUTION!
For correct system operation, space reclamation must be run at regular intervals (at
least once a week). Fujitsu Technology Solutions recommends creating a schedule to
automatically run space reclamation (see "Scheduling Space Reclamation" on page
269). 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 425).
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.
ETERNUS CS800 423
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