Grid version: 220.127.116.11
Platform : Oracle Linux 6.3
If I manually name the following redo log file as shown below without depending on OMF
SQL> ALTER DATABASE ADD LOGFILE MEMBER '+RL_DG/orcl/onlinelog/redo3b.log' to group 3;
From ASMCMD> ls -l output , I can see another file being pointed to redo3b.log like
redo3a.log => +RL_DG/orcl/onlinelog/group_3.257.831130475
Which one is the ASM alias here ?
+RL_DG/orcl/onlinelog/redo3b.log is the alias here. The 'real' file which ASM has internally created for your alias is +RL_DG/orcl/onlinelog/group_3.257.831130475
All filenames in ASM are created supposedly with OMF. When you manually specify a name , ASM will create the actual file with system generated file name. spfile creation in ASM is a classic example for this.