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Overview of settings used by the Host Utilities

The Host Utilities require certain registry and parameter settings to ensure the Windows host correctly handles the storage system behavior.

Windows Host Utilities sets the parameters that affect how the Windows host responds to a delay or loss of data. The particular values have been selected to ensure that the Windows host correctly handles events such as the failover of one controller in the storage system to its partner controller. Not all the values apply for the DSM for SANtricity Storage Manager; however, any overlap of values set by the Host Utilities and those set by the DSM for SANtricity Storage Manager do not result in conflicts.

Fibre Channel and iSCSI host bus adapters (HBAs) also have parameters that must be set to ensure the best performance and to successfully handle storage system events.

The installation program supplied with Windows Unified Host Utilities sets the Windows and Fibre Channel HBA parameters to the supported values. You must manually set iSCSI HBA parameters.

Note: Starting with Windows Host Utilities 5.3, the installation program skips most settings if it detects the Data ONTAP DSM for Windows MPIO software on the host. It instead relies on the values set by the DSM installation program.

The installer sets different values depending on whether you specify multipath I/O (MPIO) support when running the installation program, whether you enable the Microsoft DSM on Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, or Windows Server 2012 R2, and which protocols you select (iSCSI, Fibre Channel, both, or none). You should not change these values unless technical support directs you to do so.