Date: Wed, 28 Mar 2012 11:56:49 +0100
I reply to myself.
Seems one of the nodes of the RAC is using $ORACLE_HOME/dbs/spfile.ora and the other one is using ASM one.
2012/3/28 Ricard Martínez <ricard.martinez_at_gmail.com>
> Anyone have hit this error trying to do alter system scope=spfile?
> ORA-32000: write to SPFILE requested but SPFILE is not modifiable
> No single note on metalink about it. I saw a few notes in oracle forum
> about ASM diskgroup being down, but they are up and runing.