在非standalone环境中,asm实例启动时，asm 的spfile的搜索顺序
参考自：
ASM spfile in a disk group (文档 ID 1668455.1)
1.The location of the initialization parameter file specified in the Grid Plug and Play (GPnP) profile.
2.If the location has not been set in the GPnP profile, then the search order changes to:
SPFILE in the Oracle ASM instance home (e.g. $ORACLE_HOME/dbs/spfile+ASM.ora)
PFILE in the Oracle ASM instance home
大家可能有疑问，你为啥强调是在非standalone环境中？因为在standalone环境中，asm的spfile的位置是存储于OLR中的,详见：
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