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FusionCube DB 3.1 Database Best Practice 03 (Oracle RAC 11g R2)

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Reducing ASM Disk Capacity Online

Reducing ASM Disk Capacity Online

  • Before capacity reduction, confirm with the customer about the number and names of the ASM disks to be deleted, and ensure that all ASM disks to be deleted are dropped from the ASM disk group and rebalance operations are complete.
  • The sequence of mounting the same volume on different database nodes may be different. As a result, the mappings between ASM disk names and device names on different database nodes may be different. Perform the following operations on database nodes separately.
  • In the following operations, the DATADISK020 disk is used as an example.


  1. Run the following command on all database nodes to check the device name corresponding to the ASM disk DATADISK020. Record the device name as /dev/sdx for the subsequent volume unmounting and deletion operations.

    [root@dbn01 u01]# ll /dev/asmdisk/ 
    lrwxrwxrwx 1 root root 6 Jun 29 11:45 DATADISK020 -> ../sdx

  2. Edit the udev rule file on all database nodes. Delete the rules from the line where the ASM disk DATADISK020 is located, save the file, and exit.

    [root@dbn01 u01]# vi /etc/udev/rules.d/99-oracle-asmdevices.rules  

  3. Reload udev rules on all database nodes.

    [root@dbn01 u01]# /sbin/udevadm control --reload-rules
    [root@dbn01 u01]# /sbin/udevadm trigger --type=devices --action=change

    Check whether the udev rules take effect after ASM disk capacity reduction.

     [root@dbn01 u01]# ll /dev/asmdisk/

  4. Log in to FusionCube Center, choose Resources > Database > Data Volume Management, click Batch Detach, select /dev/sdx recorded in step 1 on each database node, record the data volume name fc2_DATA_0016 corresponding to the /dev/sdx device on each database node for subsequent volume deletion operations, and click Detach to unmount volumes in batches.

    Batch volume unmounting and deletion operations are risky. Ensure that the device names of data volumes to be deleted are correct. All operations must be performed in a specified period.

  5. After all data volumes to be deleted are unmounted, choose Resources > Database > Data Volume Management, select the check box before the fc2_DATA_0016 list of data volumes to be deleted, and click Delete.
Updated: 2018-12-26

Document ID: EDOC1100035759

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