Exadata: Cell corruption due to repeated CREATE and ALTER GRIDDISK CLI commands

Tonight you need to read "Oracle Exadata Storage Server Software 12.1.1.1.1 and Earlier may Cause Cell Disk Metadata Corruption if Many 'Create' or 'Alter' griddisk Commands are Run Over Time" via note 2029568.1 on My Oracle Support and then open up the referenced document inside to verify if you have disks which have this corruption so you can open up an SR with Oracle as this corruption cannot be resolved and you need to engage them immediately!!