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I have an issue on 11.2.0.4 database (2 node RAC system) on AIX.  Our system is already around 25T and our full backup size almost 3,7Tb with using compress option.

Our number of datafiles are almost 1054.  We are taking our backup to disk using 16 channel. Total full backup duration is almost 4,5 hours.

Our backup duration became almost 7,8 hours last 3 days. I investigated backup log file and I noticed backup start 16 channels and that 16 channel backupsets job done almost 4:30 hours. After 16 channels backupsets  end,  one new channel opening and it keep taking backupsets by using 1 channel.

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