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Registry values set by Windows Unified Host Utilities

The Windows Unified Host Utilities installer automatically sets registry values that are based on the choices that you make during installation. You should be aware of these registry values, the operating system version, and whether Data ONTAP DSM for Windows multipath I/O (MPIO) is installed.

The following values are set by the Windows Unified Host Utilities installer. All values are decimal unless otherwise noted. HKLM is the abbreviation for HKEY_LOCAL_MACHINE.

Registry key Value When set
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\DsmMaximumRetryTimeDuringStateTransition 120 When MPIO support is specified and your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\ DsmMaximumStateTransitionTime 120 When MPIO support is specified and your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\DsmSupportedDeviceList "NETAPP LUN" When MPIO support is specified
"NETAPP LUN", "NETAPP LUN C-Mode" When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Control\Class\{iSCSI_driver_GUID}\ instance_ID\Parameters\IPSecConfigTimeout 60 Always, except when Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Control\Class\{iSCSI_driver_GUID}\ instance_ID\Parameters\LinkDownTime 10 Always
HKLM\SYSTEM\CurrentControlSet\Services\ClusDisk\Parameters\ManageDisksOnSystemBuses 1 Always, except when Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Control\Class\{iSCSI_driver_GUID}\ instance_ID\Parameters\MaxRequestHoldTime 120 When no MPIO support is selected
30 Always, except when Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Control\MPDEV\MPIOSupportedDeviceList "NETAPP LUN" When MPIO support is specified
"NETAPP LUN", "NETAPP LUN C-Mode" When MPIO is support specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\mpio\Parameters\PathRecoveryInterval 40 When your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016 only
HKLM\SYSTEM\CurrentControlSet\Services\mpio\Parameters\PathVerifyEnabled 0 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\PathVerifyEnabled 0 When MPIO support is specified and your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msiscdsm\Parameters\PathVerifyEnabled 0 When MPIO support is specified and your server is Windows Server 2003, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\vnetapp\Parameters\PathVerifyEnabled 0 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\mpio\Parameters\PDORemovePeriod 130 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\PDORemovePeriod 130 When MPIO support is specified and your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msiscdsm\Parameters\PDORemovePeriod 130 When MPIO support is specified and your server is Windows Server 2003, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\vnetapp\Parameters\PDORemovePeriod 130 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\mpio\Parameters\RetryCount 6 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\RetryCount 6 When MPIO support is specified and your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msiscdsm\Parameters\RetryCount 6 When MPIO support is specified and your server is Windows Server 2003, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\vnetapp\Parameters\RetryCount 6 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\mpio\Parameters\RetryInterval 1 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\msdsm\Parameters\RetryInterval 1 When MPIO support is specified and your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\vnetapp\Parameters\RetryInterval 1 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\disk\TimeOutValue 120 When no MPIO support is selected, except if Data ONTAP DSM is detected
60 When MPIO support is specified, except if Data ONTAP DSM is detected
HKLM\SYSTEM\CurrentControlSet\Services\mpio\Parameters\UseCustomPathRecoveryInterval 1 When your server is Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, or Windows Server 2016 only