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OceanStor 2200 V3 and 2600 V3 Storage System V300R005 SmartVirtualization Feature Guide 07

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Clearing the Path Switchover Property of the eDevLUNs that Are Masqueraded

Clearing the Path Switchover Property of the eDevLUNs that Are Masqueraded

Clear the path switchover property of the eDevLUNs that are masqueraded and convert them into common LUNs so that other online takeover tasks can be executed.

Precautions

This operation needs to be performed in developer mode on the CLI management interface of the local storage system, and this operation can be only performed by Huawei technical support.

Context

After the path switchover property of an eDevLUN that is masqueraded is cleared, the storage system where the LUN resides can be used as a heterogeneous storage system to configure other online takeover tasks.

Procedure

  1. Log in to the management interface of the local storage system's CLI and go to the developer mode.

    Log in to the CLI as user admin and enter change user_mode current_mode user_mode=developer. Then press Enter.

    admin:/>change user_mode current_mode user_mode=developer
    developer:/>  \\Successful login
    

  2. Run the change lun_takeover disable_switch_path lun_id=? command to clear the properties of the eDevLUNs that are masqueraded.

    NOTE:

    For details, see OceanStor 2200 V3&2600 V3 Storage System V300R005 Restricted Command Reference.

Follow-up Procedure

  • Run the debug command to go to the diagnostic view. In the diagnostic view, run the devlun showctrl command to check whether the properties of the masqueraded eDevLUNs are cleared successfully. The format of the devlun showctrl command is devlun showctrl lunid. For example, run devlun showctrl 1. If both Is Dst LUN and Bypass cache are displayed as no in the command output, the properties of the masqueraded eDevLUNs are cleared successfully.
    NOTE:

    For details, see OceanStor 2200 V3&2600 V3 Storage System V300R005 Restricted Command Reference.

  • Do not restore the connection (command or physical cable) between the application server and heterogeneous storage system. Otherwise, data on external LUNs may become inconsistent.
  • If an application server is running OceanStor UltraPath V100R008C20 or later, remove the mapping between the application server and the heterogeneous storage system. Otherwise, after the application server is restarted, the mapping with the heterogeneous storage system automatically recovers, causing data inconsistency on the external LUN.
  • If the UltraPath version is earlier than V100R008C20 and you need to use new functions of the storage systems taken over, stop services on the application server and upgrade the UltraPath.
    As eDevLUNs with masquerading properties cannot use some functions of the storage systems taken over and modifying masquerading properties requires service suspension; therefore, you can modify the extended property of eDevLUNs to No Masquerading when upgrading the UltraPath after services are suspended. For details about how to do so, see the content about using UltraPath in Other Types of Huawei Storage Systems.
    NOTE:

    If you upgrade UltraPath not for using new functions, you cannot modify the masquerading properties of eDevLUNs.

    If you need to configure data migration after the takeover, ignore this follow-up procedure.

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Updated: 2018-12-29

Document ID: EDOC1000106155

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