How can I roll back an Oracle 10g rac upgrade failure?

There is a problem that has been confusing for a long time. When Oracle 10g rac is upgrading crs, it should fail. RAC is a joke.

This test is completed on the Linux platform. Exercise caution when operating the production database.

1. Back up ocr And vot before Upgrade

2. Back up the inventory directory

3. Back up the crs_home directory

4. Back up the init. crs, init. crsd, init.evmd, and init.css d files.

Back up the preceding directory, and the crs should be rolled back after the upgrade fails.