NetWorker: NDMP backup of PowerScale fails with error: Failed to allocate reader buffer due to low memory condition

• NetWorker Network Data Management Protocol (NDMP) backup fails with errors:
  • NDMP Service Error: Failed to allocate reader buffer due to low memory condition, try the backup operation later
  • Error message that is found in the NetWorker workflow or backup action logs under /nsr/logs/policy/<workflow>/
  • Error message that is found in the PowerScale support bundle under the nodes in the cluster /<clustername>-1/varlog.tar/log/isi_ndmp_d
• PowerScale OneFS upgraded. 
• Changes to NDMP client:
  • NDMP Client is running with a heavy backup load due to configuration.
  • Backup Renamed Directories (BRE) option is enabled under NetWorker NDMP Client Properties.
  • NDMP multistream is enabled under NetWorker NDMP Client Properties.

1. User must contact PowerScale support and create a case.
2. User must provide the PowerScale support bundle to the PowerScale support site.

Optional Steps to provide some relief for the issue, but this must be validated with PowerScale support:

1. Verify the number of NDMP streams on PowerScale with the command:

2. Verify the NDMP settings in PowerScale with the command: