Ensuring that the multipathing software runs normally on the application server if storage devices and the AIX application server perform networking using a Fibre Channel switch

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If Fibre Channel switches are used to connect storage devices and AIX application servers, perform the following operations after multipathing software is installed on the servers to ensure the software's properly running:
Go to the FAQ-If Storage Devices and the AIX Application Server Perform Networking Using a Fibre Channel Switch, What Operations Can Be Performed to Ensure that the Multipathing Software Runs Normally After the Software Is Installed on the Application Server website.

Other related questions:
Method used to configure the application server to use the storage space provided by storage devices when the application server is installed with the CentOS operating system
Method used to configure the application server to use the storage space provided by storage devices when the application server is installed with the CentOS operating system: The CentOS operating system is an open-source edition of the Red Hat operating system, which is configured in the same way as the Red Hat operating system. When the CentOS application server is connected to the storage device, configure the application server by following steps of configuring the Red Hat application server in Configuration Guide.

Method used to safely delete a LUN mapping from an AIX application server
Perform the following operations to delete a LUN mapping from an AIX application server: On the storage device side, delete the LUN mapping with the AIX application server. On the AIX application server side, run rmdev -dl diskName to delete the virtual disk of the mapped LUN. For example, you can run rmdev -dl disk3 to delete the virtual disk disk3. Note: If the virtual disk is not deleted and a new LUN is mapped to the AIX application server, a fault occurs, indicating that the virtual disk path is missing. Rectify the fault as follows: Unmount the file systems of the original LUN and the newly mapped LUN. Close the volume group of the newly mapped LUN. Delete the virtual disks of the original LUN and the newly mapped LUN. Run cfgmgr to re-scan for disks.

Reason why redundant disks appear in an AIX application server on an IP SAN network
The AIX application server is connected to the Ethernet switch through a network cable. The switch is connected to two iSCSI host ports on the same controller of the storage device through two network cables. When a LUN is mapped to the AIX application server, the AIX application server detects redundant disks. To enhance the data transfer reliability, an application server and a storage array are usually connected over multiple paths. If the multipathing software is unavailable, those multiple paths translate into multiple redundant disks, which confuse the actual number of disks. In the Ethernet networking, the AIX application server does not support the multipathing software. Therefore, redundant disks are detected on the AIX application server. On a Fibre Channel network, AIX application servers support the multipathing software.

iSCSI initiator software supported by the application server running various operating systems
iSCSI initiator software supported by the application server running various operating systems: FAQ-Which iSCSI initiator is installed on different operating systems

Method to query the mapping relationship between LUNs and hosts on T series V100R005 devices
On the T series V100R005 storage system, you can view information about mapped LUNs by checking the host information. 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 check the host information, see Viewing Host Information.

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