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windows server 2025 datacenter, cannot add feature Multipath I/O

Larry 0 Reputation points
2025-09-10T22:54:00.8366667+00:00

i got windows server 2025 datacenter and was trying to connect sans drives using iSCSI which seems to be ok however the Multipath I/O was not working, like it was showing multiple drives in disk mgt after connecting so multipath had issues. san is dell complent

long story short after searching around used powershell to uninstall Multipath however it completely removed from the server. it's still showing as a feature to install but it errors out. registry is clean and pointing to downloaded ISO in sources just don't work. never can find it.

I need help

Windows for business | Windows Server | Storage high availability | Clustering and high availability
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  1. Quinnie Quoc 5,835 Reputation points Independent Advisor
    2025-09-11T03:14:04.21+00:00

    Dear Larry,

    We understand you're experiencing issues with Multipath I/O (MPIO) on your Windows Server 2025 Datacenter installation after uninstalling the feature via PowerShell. Based on your description, the system now fails to reinstall MPIO, even when pointing to a local ISO source, and the registry appears clean.

    This behavior may be related to a known issue where remnants of the MPIO device instance prevent reinstallation. Microsoft has documented this under Error 0x800f0922 during MPIO feature installation. The error typically occurs when the system detects a conflicting or orphaned device entry.

    We recommend the following steps:

    Use Device Manager to enable “Show hidden devices” and remove any residual MPIO-related entries under “Storage controllers.”

    Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth to repair system components.

    Attempt reinstalling MPIO using: Install-WindowsFeature -Name Multipath-IO -Source D:\sources\sxs (Replace D: with your actual ISO mount path.)

    If this message is useful for you, please give it a vote.

    Best regards,

    Quinnie Quoc.

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  2. Larry 0 Reputation points
    2025-09-11T11:34:19.5066667+00:00

    nothing was in the device manager relating to mpio

    registry is clean

    still can't see sources when point to location

    don't really won't to wipe server because this should install, correct

    I mean if poweshell can remove then it should add it back

    i have iSCSI connections, should i disconnect, you think that might be affecting the install

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  3. Larry 0 Reputation points
    2025-09-11T11:47:49.82+00:00

    Install-WindowsFeature -Name Multipath-IO -Source C:Install\ISO-Extracted\sources\sxs

    Install-WindowsFeature : The request to add or remove features on the specified server failed.

    Installation of one or more roles, role services, or features failed. Error: 0x800f0916

    At line:1 char:1

    • Install-WindowsFeature -Name Multipath-IO -Source C:Install\ISO-Extra ...
    • 
    + CategoryInfo          : InvalidOperation: (@{Vhd=; Credent...Name=localhost}:PSObject) [Install-WindowsFeature],

    Exception

    + FullyQualifiedErrorId : DISMAPI_Error__Failed_To_Enable_Updates,Microsoft.Windows.ServerManager.Commands.AddWind

   owsFeatureCommand

    Success Restart Needed Exit Code Feature Result

    False No Failed {}

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