Avamar: Unable to re-replicate backups after a rollback (DD Retention Lock Enabled)

Summary: When a target Avamar system performs a rollback with the Data Domain Retention Lock enabled, the missing backups can no longer be re-replicated.

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Symptoms

Environment:

  • Avamar 19.4 or higher
  • Avamar and Data Domain configured for Data Domain Retention Lock
  • Avamar replication configured

Events leading to the issue:

  1. All replications are up to date.
  2. A target Avamar server encounters an issue that requires a rollback.
  3. As designed, Avamar metadata is rolled back, but Data Domain does not do a rollback
  4. The target Avamar server looses a day worth of replications
  5. Avamar attempts to re-replicate the missing day, however these replications fail with the following errors:
2023-09-16 16:37:36 avtar Info <18132>: ReplicateTo: File: avamar-1686778005/STAGING/9e6328161eb651bca9895b9e366d73e140f039ba/BACKUP-71DAA63733B772087BDEBE04199270745F2B6508-1D9E75A6C8087DC/ddr_files.xml, original file size: 4,303 (4.202 KB), precompression size: 4,303 (4.202 KB), network bytes sent: 2,548 (2.488 KB), percent sent 59.21%
2023-09-16 16:37:38 avtar Warning <18125>: Calling DDR_RENAME returned result code:5034 message:the user has insufficient privilege
2023-09-16 16:37:38 avtar Error <0000>: Failed to rename file /STAGING/9e6328161eb651bca9895b9e366d73e140f039ba/BACKUP-71DAA63733B772087BDEBE04199270745F2B6508-1D9E75A6C8087DC/0BC4CD25A7EE2884EB04B9CC7A6225BE57A8A753 to /cur/9e6328161eb651bca9895b9e366d73e140f039ba/1D9E75A6C8087DC/0BC4CD25A7EE2884EB04B9CC7A6225BE57A8A753, error code: 5034, desc: the user has insufficient privilege
2023-09-16 16:37:38 avtar Info <40176>: - Multi-stream restore summary (current 0, max active 0, max cloned 0, total cloned 0, ddr handle 2): 
2023-09-16 16:37:38 avtar FATAL <0000>: Replication failed
2023-09-16 16:37:38 avtar FATAL <40009>: DDR encountered errors.

Cause

Because there is a Retention Lock on Data Domain and Data Domain did not rollback as designed, Avamar is unable to re-replicate the missing data as the data already exist on the Data Domain and is unable to be removed or overwritten.

Resolution

Workaround:
Do not re-replicate the missing backups by modifying the replication group to only replicate X days worth of most recent backups.

Permanent fix:
Upgrade to Avamar 19.10 which allows the data to re-replicate with no error.

Article Properties
Article Number: 000218096
Article Type: Solution
Last Modified: 20 Sep 2024
Version:  3
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