During some performance tests, I was wondering why rebalancing of one out of two hard disks was extremely fast - in my opinion it was too fast.
After some headache I found out, that the rebalancing caused an entry in v$asm_operation view of ASM instance. The particular row was missing in v$asm_operation view of RDBMS instance.
Rule of thumb:
Be careful when querying dynamic performance views v$asm_%. Their content depends on the instance against which you are connected
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