ORA-61861
Unable to receive redo since standby redo log is not available.
Cause
The remote file server (RFS) was unable to select a standby redo log file (SRL) to receive redo on a True Cache because SRLs were not available.
Action
See the alert log and trace file for more details. No action is necessary. This is an informational message provided to record the event for diagnostic purposes.