RMAN-06169: could not read file header for datafile nn error reason 4

 

RMAN-06169: could not read file header for datafile nn error reason 4
RMAN-06169: could not read file header for datafile nn error reason 4
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 10/20/2011 07:41:54
RMAN-06056: could not access datafile nn

The reason code of 4 meant for DBWR could not find the file. After investigating found that the new data file added on locally for a RAC database. That data file not available on other node cause this backup failure.

To resolve this, the locally create data file moved to ASM.