Checking a Diskgroup

It checks the internal consistency of the diskgroup metadata. If any errors are found they are reported in the alert log.

Instance: ASM Instance
Privilege: Sysdba

Syntax

ALTER DISKGROUP diskgroup_name CHECK check_diskgroup_clause [REPAIR or NOREPAIR]

Where,

Check_dikgroup_clause= [ALL] or [DISK diskname] or [DISKS IN FAILGROUP failgroup_name] [FILE filename]

REPAIR = ASM attempts to repair any errors.
NOREPAIR= ASM reports the error in the alert log and does not attempt to repair it.

Example 1 (checks all the disks in the diskgroup)

SQL> Alter Diskgroup ASMDATA CHECK ALL;

Example 2 (checks only specific disks in the diskgroup)

SQL> Alter Diskgroup ASMIND CHECK
DISK data_05,
DISK data_06 NOREPAIR;

Example 3 (Checks all the disks in the failure group).

SQL> Alter Diskgroup ASMDATA CHECK
DISKS IN FAILGROUP ctrl_1;

Example 4 (checks specific files in the diskgroup)

SQL> Alter Diskgroup ASMIND CHECK
FILE ‘+ASMDB/gcprod/datafile/users.259.661355087’,
FILE ‘+ASMDB/gcprod/datafile/sysaux.257.661355085’;

Thanks