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Backup or cloning may appear slower than expected for NetWorker VMware Protection (NVP) vProxy save sets on Retention Lock devices Error appears in ddfs.info log despite apparent success of backup or clone job: NetWorker: How To Collect ddfs.info log from Data Domain Attempt to rename non-empty directory /data/col1/mtree/device/active/abc3b7ed-00000006-fd27be29-6627be29-00045000-595e3c56 dboost-<nsrsvr.demo.local-55146>: ddboost_api ERROR: ddp_rename() failed, FromPath //mtree/device/active/abc3b7ed-00000006-fd27be29-6627be29-00045000-595e3c56, ToPath //mtree/device/21/06/abc3b7ed-00000006-fd27be29-6627be29-00045000-595e3c56, Err: 5034-nfs rename failed (nfs: Permission denied) Impacted NetWorker releases: 19.9.0.x (and prior) 19.10.0.0 through 19.10.0.4 19.11.0.0 and 19.11.0.1
The problem results from an undiscovered flaw in implementation. Since Data Domain Retention-locked devices do not allow renaming of non-empty directories, part of NetWorker's normal backup and clone workflow silently fails, falling back to a different mechanism which prevents optimization success.
The workflow in the following NetWorker releases: 19.10.0.5 19.11.0.2 19.12+ Workaround: The problem does not appear to affect Capacity Mode. Switching to Capacity Mode as a workaround may alleviate the problem in the short-term, but upgrade will be recommended. NOTE: Changing from one backup optimization mode to another (for example, from Optimized for Performance to Optimized for Capacity) requires performing a new full level-zero backup as the starting point for subsequent backups. Ensure that the Data Domain device has sufficient capacity. Since backups for each optimization mode must co-exist during this period, backups consume twice the usual storage capacity until the last Optimized for Capacity backup expires, as defined by the retention period. After this, storage consumption will return to normal.
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