This article explains how to workaround a Graceful Switchover issue with standby version7.0 and database version 126.96.36.199 with ASM
Graceful switchover might fail since the file created in ASM via CP command might give different aliases , which might affect the switchover.
Applicable Error Code
Standby Version 7.0 and Database Version 188.8.131.52
Check Oracle Support Note for Patch 8465740
In Version 7.0 with database version 184.108.40.206 , there might be issues during the graceful switchover process , since the ASM file created via CP command might add aliases to the files , there by failing to be identified by the Standby Switchover process.
There are two possible solution for this issue.
1. Apply the patch 8465740 , which is recommended so that the graceful switchover can be done without any issues.
2. Set the parameter _FORCE_ASM_READ_WRITE = Yes in the DDC file(this is a workaround so test this in a local environment).
Please note this only affects the Graceful switchover process since the process copies file to the ASM , It does not affect any of the other processes like standby creation or synchronisation process. It does not affect the standby activation as well.