Return
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Title
Deduplication does not start as dedupe-cap is exceeded however there are no active operations -
Description
The SmartDisk dedupe queue is growing as backups complete but the queue is never processed.Although Deduplication is enabled, it does not start during its configured windows.The Garbage collection windows are clearly defined outside of the Deduplication windows and there is ample space for Stage and Store.However from the stats and config outputs we can see the Stage volume has reached its activity limit while no active operations are seen:Deduplication Activity Cap = 4Active Operations = 4Active = 0Active.Read = 0Active.Write = 0Active.Delete = 0Active.MkDir = 0Active.Move = 0Active.Copy = 0Active.Read Properties = 0Active.Read Options = 0Active.Delete Staging = 0Active.Delete Rollback = 0Active.Rollback Element = 0Superserver trace shows the below indicating an issue reseting the activity count:0 DSTORAGE ??? 110 100636125052 Failed to decrement 'Activity Count' counter : '0' - '1' < 0If the dedupe-cap per volume is increased, deduplication will start successfully. -
Cause
This issue has been identified as Bug 26524, which prevents deduplication from starting due to a report of an incorrect Volume Activity Count after backup jobs failed or were aborted. The error was reported as “Activity Limit Exceeded” for the Volume Cap.
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Resolution
STATUS
Bug 26524 is fixed in SmartDisk 10.0.0. In the meantime, please consider the following:
WORKAROUND:
- Restart SmartDisk to reset the volume activity counters
- If restarting SmartDisk is not possible increase the relevant volume dedupe-cap value to allow deduplication to start.
Example:
smartdisk config --update --volume "D:\stage" --dedupe-cap 8smartdisk config --update --volume "D:\store" --dedupe-cap 8 -
Defect ID
26524