PowerScale: Isilon: OneFS 8.2.x, 9.0.x: Backup Restartable Extension Must be Disabled for MultiStreaming NDMP Backups 

The Backup Restartable Extension (BRE) captures a working file and stores it within a context, which acts as a checkpoint in the event of a backup job failure. If the backup or restore job is interrupted and later resumed, BRE uses this checkpoint to continue the operation from where it left off. On a PowerScale cluster, the default number of available BRE contexts is 64. To view the current number of configured contexts (supported in OneFS 8.2 and later), use the following command:

powerscale-1# isi ndmp settings global view
                       Service: True
                          Port: 10000
                           DMA: generic
          Bre Max Num Contexts: 64 <--- Defined BRE contexts 
MSB Context Retention Duration: 300
MSR Context Retention Duration: 600
        Stub File Open Timeout: 15
             Enable Redirector: False
              Enable Throttler: False
       Throttler CPU Threshold: 50
powerscale-1#

Multi-Streaming is a feature in OneFS that accelerates backup performance by dividing the workload across multiple parallel data streams. It includes its own internal checkpointing mechanism to recover from failures during backup or restore operations. However, when BRE and Multi-Streaming are enabled simultaneously, conflicts arise because each feature manages checkpoints independently. This can lead to ambiguity in backup state tracking, as the system cannot reliably determine how to resume the job, resulting in unsupported or unpredictable behavior. 

Resolution
Disable BRE on the backup server. For instructions, contact the vendor for the appropriate procedures.