11gR2 Grid Infrastructure node went down
In our environment we have 3 nodes GBBGRDLI20,GBBGRDLI21,GBBGRDLI22 in that 11gR2 Grid is installed on Linux OS. Due to issue in OS on GBBGRDLI20 node went down, to fix this issue Linux team is planning to reinstall OS. So from Oracle Grid perspective what action needs to be taken before OS reinstallation and post OS installation. Pls suggest us as this is very critical system.