I am beginner for Oracle ASM I know we can alter asm_diskstring with following ways
but these requires +ASM to be UP and running. Is there way to set asm_diskstring when +ASM instance is down ?
You can create pfile to set
$ vi asmpfile.ora instance_type=asm asm_diskstring=path_to_asmdisks
Then can start asm instance using this pfile and later can create spfile from pfile.
What's wrong with simply "alter system set asm_diskstring='whatever' scope=both;"