Cannot Delete Some Multiparts (code 3021)
Situation
A backup plan terminates with the following error: Cannot delete some multiparts. Some multiparts were not deleted on backup storage for some reason
Error code: 3021
Cause
The occurrence of this info message means that automatic multipart deletion failed to delete some unfinished multipart uploads for some reason.
If this info message appears on a constant basis, this may lead to increased storage bills.
Solutions
Since the reason is unknown, the issue may be on the cloud storage side and may disappear by itself on the next backup plan run. The automatic unfinished multipart uploads deletion mechanism works as follows:
Unfinished files (multipart uploads) with a creation date more than 30 days ago are subject to purge.
Purging frequency: once a week.
How It Works
At the end of every backup plan run, the unfinished multipart purging mechanism starts.
The algorithm of the automatic purge consists of two stages:
- Search for unfinished multipart uploads is executed.
- Unfinished multipart uploads are found and purged.
Purging Necessity Check
The connection must be in regular mode and support automatic deletion of unfinished multipart uploads.
- All backup plans are checked to see whether the connection supports automatic multipart deletion.
- For each plan found, the information on the last 10 runs is analyzed.
- The purging mechanism searches for backup plan runs with the 'Success' result and a start date later than Monday of the current week.
- If such a plan is found, then it is assumed that the automatic purging of unfinished files was already carried out during the current week and is not required to be executed again.
- In addition to successfully completed plans, plans running at the moment of the check are also checked.
Search for Unfinished Multipart Uploads
The search is performed using a connection in the specified bucket and prefix.
Identification and Purging
Unfinished multipart upload identification occurs while iterating through the received list of unfinished multipart uploads that were found. Unfinished files created more than 30 days ago from the current date are considered for purging.
Such files are deleted immediately.
Delete Unfinished Multipart Uploads Using Storage Provider Console
If the info message still persists, you can try to delete unfinished multiparts directly in your storage provider management console.