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OceanStor UltraPath for vSphere 21.3.0 User Guide 03

This document covers the functions, features, installation, configuration, upgrade, uninstallation, maintenance, troubleshooting, and FAQs of OceanStor UltraPath for vSphere (UltraPath forvSphere). UltraPath for vSphere is the multipathing software developed by HuaweiTechnologies Co., Ltd (Huawei for short). The document aims at helping users to be fully familiar with UltraPath for vSphere and its use.
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How to Correctly Change a LUN Mapping View on a Storage Array?

How to Correctly Change a LUN Mapping View on a Storage Array?

Question

How to correctly change a LUN mapping view on a storage array?

Answer

If you remove a LUN mapping on an array and add the LUN to the host again in a different mapping sequence, the corresponding Host LUN ID will change and a series of exceptions will be caused.

To rectify this fault, you must comply with the following steps to change the LUN mapping view.

Solution

  • Scenario 1

    The LUN has been added to VMs in the mode of raw disk mapping or virtual disk mapping.

    1. Before removing the LUN mappings on the array, ask the administrator to stop the services running on the disk, namely, the LUN. Remove the corresponding raw disk mapping or virtual disk mapping from VMs.
    2. Delete the LUN mapping view on the GUI management page (ISM or DeviceManager) of the array and add a new LUN mapping to the host.
    3. Scan for the disk again.

      If the host operating system is ESXi 5.0, run the esxcfg-rescan -A command twice to scan for the disk. If the host operating system is ESXi 5.1/5.5/6.0/6.5/6.7, you only need to run the esxcfg-rescan -A command once to scan for the disk.

    4. Add the LUN to VMs again in the mode of raw disk mapping or virtual disk mapping.
    5. Contact the administrator to start services.
  • Scenario 2

    The LUN is not provided for VMs.

    1. Delete the LUN mapping view on the GUI management page (ISM or DeviceManager) of the array and add a new LUN mapping to the host.
    2. If the host operating system is ESXi 5.0, run the esxcfg-rescan -A command twice to scan for the disk. If the host operating system is ESXi 5.1/5.5/6.0/6.5/6.7, you only need to run the esxcfg-rescan -A command once to scan for the disk. The disk information is thereby updated.
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Updated: 2019-06-29

Document ID: EDOC1100052672

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