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May be this might help you http://blog.trivadis.com/b/robertbialek/archive/2012/07/04/oracle-asm-spfile-stored-in-an-asm-disk-group-how-it-works.aspx
user13375747Please consider closing your questions by providing appropriate points if you feel that they have been answered rather than keeping it open. Please keep the forum clean !!
Status Level: Newbie
Registered: Sep 14, 2011
Total Posts: 7
Total Questions: 6 (6 unresolved)
user13375747 wrote:it's MAGIC.
I have a couple of questions regarding ASM SPFILE.
1)How ASM instance can read the SPFILE from ASM disks, id they are not mounted?
2) How ASM knows where to get SPFILE if there is no init.ora file in $ORACLE_HOME/dbs with SPFILE=[path to spfile]
Thanks in advance
The olr.loc file tells ASM where to locate the spfile and on which physical disk it is located. The header-section of the physical devices CAN contain things like OCR, VOTING and SPFILE.