An Event ID 56 is logged on boot in Windows Server when multiple disk paths are available
When multiple paths are available to a disk in Windows Server 2008 R2 and later versions, an error event that resembles the following may be logged in the System event log:
Log Name: System
Source: Application Popup
Event ID: 56
Description: Driver SCSI returned invalid ID for a child device (000000).
The issue occurs because the inbox Storport driver does not create unique instance IDs for disks exposed by multiple paths.
Since the Plug and Play (PnP) manager will auto-generate unique instance IDs when duplicates are found, this error can safely be ignored and no user action is required.
Article ID: 2685788 - Last Review: 11/07/2016 20:24:00 - Revision: 7.4
Windows Server 2016, Windows Server 2016 Essentials, Windows Server 2016 Datacenter, Windows Server 2012 Datacenter, Windows Server 2012 Standard, Windows Server 2012 Essentials, Windows Server 2012 Foundation, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Standard, Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows Server 2012 R2 Standard