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Oracle 11g Plus ASM Failed to Detect updiskX on AIX

Publication Date:  2013-06-28 Views:  154 Downloads:  0
Issue Description
  • is installed.
  • In the AIX operating system running Oracle 11g, ASM is used to scan for disks. However, the UltraPath generated virtual disk updiskX cannot be detected.
Alarm Information
Handling Process
Step 1 Uninstall the UltraPath.
Step 2 Install the package that will generate a drive letter hdisk.
You can choose either of the following methods to install the package:
  • Use the script. Select the VxVM installation package, as shown in the following figure.
  • Install the installation package with the Vxvm characters.
    The following figure shows the installation command.

Currently, the installation script is added with a prompt message, which is displayed as follows. Choose the correct installation package as prompted. The following figure shows the installation interface.
Root Cause
The AIX UltraPath provides two types of installation packages. The following table shows the mapping relationship between installation packages and their drive letters.

In this case, the multipathing software package is, which generates a drive letter updisk. This drive letter is named by Huawei customized method and differs from the traditional naming method (hdisk) of the AIX operating system. As a result, the virtual disk updiskX cannot be identified or accepted by some application programs.

NOTE: Since VxVM or Oracle ASM cannot identify a disk with the drive letter updisk, the installation package with Vxvm characters converts the drive letter updisk of a virtual disk into hdisk, enabling the disk to be identified by VxVM or Oracle ASM.
You are advised to use the VxVM UltraPath installation package, which names the virtual disk hdisk in accordance with the drive letter name of the AIX operating system. In this way, the problem occurrence probability is reduced.