Why does an application server fail to detect the mapped virtual disks after being configured with the UltraPath for Windows software?

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The possible causes for a virtual disk detection failure include:
? The UltraPath for Windows software is incompatible with the Windows operating system installed on the application server.
? The UltraPath for Windows software is incompatible with the storage array.
? The LUNs are mapped to the application server before being formatted.
? The bit version of the UltraPath for Windows installation package is incompatible with that of the operating system running on the application server. For example, the application server runs a 32-bit operating system but uses a 64-bit installation package.
? The application server does not detect any physical disks, so it cannot produce virtual disks.
? The driver of physical disks is not replaced.
The respective troubleshooting measures to the previous six causes are:
1. Confirm that the UltraPath software is installed on its supported operating system. The UltraPath for Windows-supported operating systems are Windows Server 2008 Enterprise Edition x86 SP1 and later, Windows Server 2008 Enterprise Edition AMD64, Windows Server 2003 Enterprise Edition x86 SP1 and later, Windows Server 2003 Enterprise Edition AMD64 SP1 and later, and Windows Server 2000 SP4.
2. UltraPath for Windows only supports the storage arrays from Technologies Co., Ltd.
3. Wait until the LUNs are formatted, and then scan for them on the application server.
4. Ensure that the operating system version is compatible with the installation package. If an inappropriate installation package has been installed, uninstall it first, restart the operating system, and then install the package of the proper version.
5. Check whether the physical links are normal. If they are normal, ensure that the LUNs are normal in the storage array and successfully mapped to the application server.
6. Check that the driver of physical disks is replaced.
? If the UltraPath software is not installed, before the installation, go to the C:\windows\inf directory and open all the inf files starting with oem. In each file, search for the following keywords: MPIODisk, Detected\MPIO, and Root\HWDSM. If a file contains one of the keywords, delete this oem.inf file and its related oem.pnf file. After ensuring that none of the oem.inf files contains the keywords, you can install the UltraPath software.
? If the UltraPath software is already installed, choose Computer Management > Device Manager > Disk Drivers to view the driver information of physical disks. If the driver of a physical disk is not mpdev.sys, the driver has not been replaced. Uninstall the faulty physical disk and rescan for disks.
? During service idle hours, restart the application server.

Other related questions:
Why does an application server lose all the LUNs mapped to it after being configured with the 360 Safe software?
The cause is that the 360 Safe software disables the iSCSI services. You can manually restart the iSCSI services and scan for the disks, and then the LUNs mapped to the application server can be detected again. The 360 Safe software disables the iSCSI services; therefore, you are advised to uninstall the 360 Safe software from the application server, and install another security software.

The application server connected to the OceanStor V3 storage system fails to detect LUNs
Refer to Revelations of Troublesolving cases on the right.

Why the number of hard disks scanned by the application server is a multiple of the number of hard disks mapped to the application server?
The multipathing software is not installed. If the multipathing software is not installed, the OS cannot determine whether the LUNs scanned from several physical paths are the same LUN, and assumes them as different LUNs; therefore, multiple mock disks appear on the AS. If the multipathing software is installed, it can determine whether the LUNs in different sessions are the same LUN by analyzing the world wide name (WWN) of each LUN, and eliminates the mock disks. In this way, the number of hard disks scanned by the AS is the number of LUNs actually mapped to the AS. You can obtain the installer of the multipathing software from the delivery-attached CD-ROM and install the program according to the actual OS.

Why does the Windows Multi-Path I/O service remain enabled after the Multi-Path I/O software is uninstalled from and then UltraPath software is installed on a Windows Server 2008 application server?
The multipathing software for Windows Server 2008 relies on the Multi-Path I/O service; therefore, UltraPath software for Windows Server 2008 inherits Windows Multi-Path I/O service architecture and cooperates with Windows Multi-Path I/O service.

Why does an AC fail to detect unauthorized APs after calibration is enabled
Perform the following operations to locate the fault: 1. Check whether unauthorized AP detection is enabled when calibration is enabled on the AC. 2. Check whether neighbor detection is enabled for the AP. Perform the following operations on the AC: 1. After the calibration command is executed, check whether the AC sends a neighbor detection message to the AP. 2. Check whether the AP receives the neighbor detection message from the AC. 3. Check whether the AP reports detected neighbor information to the AC. 4. Check whether the AC receives neighbor information sent from the AP. 5. Check whether errors occur when the AC is saving received neighbor information.

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