Recover disk in NORMAL redundancy

 

Steps to Recover a Disk in Normal Redundancy

Solution 1:

Solution 2:-

Steps to Recover a Disk in Normal Redundancy

1. Identify the Problematic Disk

   • Log in to ASM and check the status of the disk group and disks:

     SET LINESIZE 200
     COL NAME FORMAT A30
     SELECT GROUP_NUMBER, NAME, STATE, PATH FROM V$ASM_DISK;
     

   • Check for any disks in the MISSING state or flagged with FORCING OFFLINE.

2. Drop the Missing/Failed Disk

   • Drop the failed disk from the disk group:

     ALTER DISKGROUP <diskgroup_name> DROP DISK <disk_name>;

   • If the drop operation is stuck, you can force the drop:

     ALTER DISKGROUP <diskgroup_name> DROP DISK <disk_name> FORCE;

3. Add a New Disk (if necessary)

   • If there is no replacement disk automatically available, you will need to add a new disk to the disk group:

     ALTER DISKGROUP <diskgroup_name> ADD DISK '/path_to_new_disk';

4. Rebalance the Disk Group

   • ASM will automatically rebalance the disk group when a disk is added or removed. Monitor the rebalancing process:

     SELECT OPERATION, STATE, SOFAR, EST_WORK FROM V$ASM_OPERATION;

   • Optionally, you can manually adjust the rebalancing power to speed up or slow down the process:

     ALTER DISKGROUP <diskgroup_name> REBALANCE POWER <level>;

     Replace <level> with a value from 0 (low impact) to 11 (high impact).

5. Verify the Disk Group Status

   • After rebalancing completes, check the status of the disk group:

     SELECT NAME, STATE, TYPE, TOTAL_MB, FREE_MB FROM V$ASM_DISKGROUP;

   • Ensure there are no errors or missing disks.