ASM disks must be owned by grid:asmadmin (or oracle:asmadmin in older setups) with 660 permissions. If udev rules or ASMLIB configuration changes, the checker flags a failure.
: SELECT name, path, mount_status, header_status, state FROM v$asm_disk; asm health checker found 1 new failures
: Disks are missing, offline, or have lost membership. ASM disks must be owned by grid:asmadmin (or
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: Problems during the addition of new disks or voting file refreshes. Immediate Troubleshooting Steps Check the ASM Alert Log : Locate the alert log for your ASM instance (often in /u01/app/oracle/diag/asm/.../trace/alert_+ASM.log state FROM v$asm_disk