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I faced that warning message during my restore process from RAC Database with ASM that has been converted or restored to the Standalone Single Instance Non-ASM Database.
I also noticed RMAN is taking significant time than normal restore time.
From the RDBMS alert.log, it is showing continuous following messages.
ASMB started with pid=32, OS id=28124 WARNING: failed to start ASMB (connection failed) state=0x1 sid='' WARNING: ASMB exiting with error Starting background process ASMB
