The application server connected to the OceanStor V3 storage system fails to detect LUNs

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Refer to Revelations of Troublesolving cases on the right.

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LUN mapping of OceanStor V3 storage systems
After a host group and a LUN group are added to a mapping view, the application server, host group, and LUN group are logically associated. Then the application server can detect the LUN in the LUN group. For details about creating a mapping view, click Creating a Mapping View .

Method used to detect new LUNs on the host of OceanStor T/V3 storage systems
If Huawei UltraPath is installed on the host, run the hot_add command to scan for disks. The existing services will not be affected. If the multipathing software is not installed, use the iSCSI network and restart the iSCSI service. If the Fibre Channel network is used, restart the server.

Method used to expand LUNs of OceanStor V3 storage systems
For details on how to expand LUNs on the DeviceManager, and then detect LUNs on the host to identify the expanded LUNs, see Expanding a LUN .

Online expansion methods when LUNs cannot be detected on the host of an OceanStor V3 storage system
SmartThin provides two methods for online expansion: storage pool expansion and thin LUN expansion.

For V3 series unified storage V300R001, how can I query the mapping relationship between LUNs and hosts?
For V3 series unified storage systems V300R001, you can obtain the information about LUNs and its mapped hosts from the mapping view. You can identify the corresponding relationship between storage systems' hosts and their connected application servers in the live network through parameters such as host names and host operating systems. You are advised to use a host name that is easy for you to recognize the host's corresponding application server. For details about how to view mapping views, see Viewing Mapping View Information.

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