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12c Database : ASM Enhancements : Logical corruption checks on disk, disk scrubbing

ASM 12c provides proactive scrubbing capabilities on disks that check for logical corruptions and automatically repair them where possible.

SQL> alter diskgroup DG1 scrub repair;
Diskgroup altered.

SQL> alter diskgroup DG1 scrub file '+DATA_DISK/Geek DBA12C/DATAFILE/system.254.939393617' repair wait;
Diskgroup altered.

SQL> alter diskgroup DG1 scrub disk DATA_DISK1 repair power max force;
Diskgroup altered

REPAIR: If the repair option is not specified, ASM only check and report logical corruption
POWER: LOW, HIGH, or MAX. If power is not specified, the scrubbing power is controlled based on the system I/O load
FORCE: Command is processed immediately regarless of system load

Two ways of scrubbing: On-demand by administrator on specific area as like above, Occur as part of rebalance operation if disk attribute content.check=TRUE mentioned at disk level.

SQL> alter diskgroup DG1 attribute 'content.check' = 'TRUE';
Diskgroup altered.

-Thanks

Geek DBA

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