StoreOnce Backup Storage

D2D housekeeping

M. N.

D2D housekeeping

I have a D2D unit using as a NAS to host backup.

Using the D2D dedup features the unit was filled up to 90% physical space.

I deleted more than 1 TB of data but I don't see any increase in available space.

How can I perform housekeeping on the unit in order to recover the available space?




Re: D2D housekeeping


Please be aware this is deduplication system so if you delete 1TB of data does not mean 1TB will be free.

If the system is 90% Full you can do the below:


To reduce the risk of system unavailability, monitor your disk storage capacity to ensure that storage utilization stays below 80%. Keeping available disk storage capacity above 20% offers the best backup and deduplication performance. Prior to reaching 80% utilization, consider adding additional disk storage and review best practices and implementation guides to insure the solution remains optimized.

Stop all backups and replication until disk space is reclaimed.


Expire media and overwrite cartridges with new data.


Delete unused virtual tape libraries (VTLs) or NAS shares where data has expired.


Delete synchronized replication targets, if they exist.


Delete any Store which you feel has not  IMP data…so that the space reclamation is very fast


Use backup software to perform a tape copy or object copy to physical tape.


Remove any housekeeping blackout window so housekeeping can process new tasks created by space to be reclamation tasks.


Think of adding more disk enclosures


CAUTION: Reformatting or deleting virtual cartridges does not always release space consumed in deduplication stores. Since the data can be referenced on multiple cartridges, only the changed data is reclaimed.

Space reclamation is not an immediate process  it might take days or weeks depends on the type of data.

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