Setting the ALUA mode

Virtual Storage Platform One Block Administrator User Guide for VSP One Block 85
Version
A0-05-4x
10.5.x
Audience
anonymous
Part Number
MK-26VSP1B025-02
ft:lastEdition
2026-06-22

To specify the preferred I/O path by using Edit Asymmetric Access States in a cross‑path configuration, you must enable ALUA mode on the volume. You can configure ALUA mode before creating a GAD pair or on a volume that already belongs to an existing GAD pair.

Enabling ALUA mode on the primary volume before GAD pair creation automatically enables ALUA mode on the secondary volume when the pair is created.

Note:
  • It is not necessary to set the ALUA mode if a cross-path configuration is not used.
  • If the target volume belongs to an existing GAD pair, suspend the GAD pair before changing the ALUA mode.

Verify that the following conditions are met:

  • The volume is not classified as a system volume or namespace volume.
  • If the host server already recognizes the volume, shut down the host.
  • If the volume belongs to an existing GAD pair, suspend the pair before changing the ALUA mode. Before suspending a pair, confirm that the quorum disk is healthy to prevent the GAD environment from entering a blocked state if a failure occur.
  1. From the navigation tree, select Storage > Volumes.
  2. From the volume list, click a volume name to display the details page.
    Tip: To set the ALUA mode for a volume assigned to a server, you can also select Storage > Servers in the navigation tree, select a server name from the server list page, and then use the volume list at the bottom of the details page.
  3. (Optional) Check the current ALUA mode of the volume.
    Depending on the configuration, the ALUA mode might not be visible on the volume details page. For example, when the volume is not used as a GAD pair and ALUA is disabled.
    Tip: On the volume list page, enable the ALUA Mode column in the column settings and apply the change. This allows you to always verify the ALUA mode regardless of the volume state.
  4. From the volume list page, select the target volume.
  5. From the vertical ellipsis menu, click Edit ALUA Mode.
  6. In the Edit ALUA Mode dialog box, confirm the volume name and volume ID, and then select one of the following options:
    • Enabled
    • Disabled
  7. Click Submit.
  8. Assign the primary volume to a server. To assign the primary volume with the configured ALUA mode to a server, use one of the following procedures:

    Attaching volumes to servers by selecting servers

    Attaching volumes to servers by selecting volumes

  • If the target volume belongs to an existing GAD pair, resynchronize the GAD pair after changing the ALUA mode, and then restart the host server to apply the new ALUA settings.
  • If the ALUA mode is set before creating a GAD pair, resynchronization is not required.