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How to reinstall Grid Infrastructure (Clusterware) binaries of existing but not working RAC?

osamarinSep 4 2017 — edited Sep 5 2017

I have a two node RAC with ASM shared storage. The single ASM diskgroup contains database files (several databases in one cluster), OCR and vote disks.

After unsuccessful patching of GI home the RAC can not more start on any node. Rollback is also not possible. Unfortunally, I do not have GI Home backups, but OCR and all OLR backups survived. All ASM data is also survived.

I'd like to reinstall GI home binaries from scratch on both nodes and join them to existing OCR.

The first step would be the 'software-only' installation. What should be the next steps?

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Locked due to inactivity on Oct 3 2017
Added on Sep 4 2017