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My guess would be some sort of exhuastion on the master server.
Is there anything to see in nmon ? Thinking memory especially virtual memory, disk I/O latency
Ask about disk I/O latency because we had some strange issues when the disk hosting the NBDB and catalog latency had gotten above the recommend 20 ms latency.
Think there is something about the number of sessions to NBDB too, cannot see why that should effect only database backups though. But database backups is generally more sensitive to problems than file backups.
And the usually question anything changed on the master/disk system last week ?
Can your start a manual backup when this issue exists ? Just to confirm see if the bprd
If the master has been running for a while, it might be worth to go through the sizing of it for the current load to see if it should be up for the job.
I would do scheduled bpps too see if any netbackup process memory usage grew abnormally
Hope this helps you
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