1. Owner's Guide
  2. Security and Maintenance of Recovery Appliance
  3. Maintaining the Recovery Appliance Hardware
  4. Maintaining the Physical Disks of Storage Servers
  5. About Rebalancing the Data

About Rebalancing the Data

After you replace the physical disk, you must re-create the grid disks and cell disks that existed on the previous disk in that slot. If those grid disks were part of an Oracle ASM group, then add them back to the disk group, and rebalance the data, based on the disk group redundancy and the ASM_POWER_LIMIT parameter.

Oracle ASM rebalance occurs when dropping or adding a disk. To check the status of the rebalance:

  • Did the rebalance operation run successfully?

    Check the Oracle ASM alert logs.

  • Is the rebalance operation currently running?

    Check the GV$ASM_OPERATION view.

  • Did the rebalance operation fail?

    Check the V$ASM_OPERATION.ERROR view.

You can perform rebalance operations from multiple disk groups on different Oracle ASM instances in the same cluster, if the failed physical disk contained ASM disks from multiple disk groups. One Oracle ASM instance can run one rebalance operation at a time. If all Oracle ASM instances are busy, then the rebalance operations are queued.