ASM DISKGROUP CORRUPTION:
Raise SR with oracle support and share asm alert logs, crs logs.
Below steps don't try on production environment without confirmation from oracle support.
Step 1: Dismount the problem diskgroup from all nodes:
alter diskgroup TEST_DATA dismount;
Step 2:
amdu -diskstring 'ORCL:ASM_TEST_DATA*' -dump 'TEST_DATA01' -noimage
Step 3:
alter diskgroup TEST_DATA CHECK NO REPAIR;
Step 4:
alter diskgroup TEST_DATA CHECK REPAIR
