Windows Unified Host Utilities 7.1 Release Notes

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This Release Notes document contains the latest information for the Windows Unified Host Utilities 7.1 release, including updates about new features, enhancements, and known issues. The document is updated when new information on using the Windows Host Utilities becomes available.

About the Windows Unified Host Utilities 7.1 release

The Windows Unified Host Utilities enable you to connect a Windows host computer to NetApp storage systems. The Windows Unified Host Utilities include an installation program that sets the required Windows registry and HBA values.

The Windows Unified Host Utilities 7.1 continues to support the following versions of Windows:

  • Windows 2012

  • Windows 2012R2

  • Windows 2016

  • Windows 2019

  • Windows 2022

Note NetApp qualifies additional components between releases of the Host Utilities software. For the latest information about the system requirements, see the NetApp Interoperability Matrix Tool.

Features in this Host Utilities release

Windows Unified Host Utilities 7.1 includes support for E-Series storage systems, support for ONTAP 9 and later versions, and enhanced iSCSI timeouts for faster failover.

Important cautions

Before deploying the latest release of Windows Host Utilities, you must read the information available to help you identify and resolve issues that might affect the operation of your systems.

For more information about an individual bug and to explore other bug-related tools, see NetApp Bugs Online.

Installing the required hotfixes

To ensure a successful installation or upgrade of Windows Unified Host Utilities, you must install a specific Windows hotfix. Some hotfixes are a component of Windows updates.

Refer to the Windows Host Utilities documentation for your specific configuration hotfix requirements.

Known issues

Some unexpected and potentially undesired behaviors, as well as, in some cases, workarounds to avoid these behaviors, have been identified in this release.

Title Description Workaround

Running the script is no longer required on Hyper-V guests running Red Hat Enterprise Linux or SUSE Linux Enterprise Server

You are no longer required to run the script to change disk timeouts on Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, or SUSE Linux Enterprise Server 11 Hyper-V guests because the default timeout settings are being used. The script that was included in previous versions of the Host Utilities is no longer included in the Windows Unified Host Utilities. Windows Unified Host Utilities 7.1 uses the default disk timeout settings.


iSCSI sessions do not reconnect after reboot with mixed IPv4 and IPv6

In a multipath I/O (MPIO) configuration or multiple connections per session (MCS) configuration that has both IPv4 and IPv6 endpoints, some iSCSI sessions might fail to reconnect after rebooting the Windows host.

To ensure that all of your iSCSI paths return after a reboot, use either all IPv4 endpoints or all IPv6. Do not mix IPv4 and IPv6.

MCS is not supported with iSCSI software boot

When using iSCSI software boot with iSCSI multiple connections per session (MCS), the iSCSI boot leading connection cannot be protected. This can lead to disconnection from the boot LUN causing the host to crash.

Microsoft does not support MCS for iSCSI software booted hosts. Use MPIO as the high availability solution. Note that mixing MPIO and MCS is not supported.

NetApp Bugs Online provides complete information for most known issues, including suggested workarounds where possible.

About SAN Host Configuration documentation

Documentation for SAN Host Utilities is included in the ONTAP SAN Host Configuration documentation. ONTAP SAN HOST configuration documentation is cumulative, covering all current SAN HOST releases. Any functional differences across releases are noted in context.

Where to find product documentation and other information

You can access documentation for all NetApp products and find other product information resources, such as technical reports and white papers on the Product Documentation page of the NetApp corporate site.

Related information

Configuring and managing your ONTAP storage system

Configuring and managing your E-Series storage system

  • The SANtricity Storage Manager Configuration and Provisioning for Windows Express Guide that is appropriate for your protocol

  • The SANtricity Storage Manager Configuration and Provisioning Express Guide for your operating system, protocol, and version of SANtricity.

  • The SANtricity Storage Manager Software Installation Reference specific for your version of SANtricity.

  • The SANtricity Storage Manager Multipath Driver’s Guide specific for your version of SANtricity.

  • The SANtricity Storage Manager Release Notes for your version of SANtricity.

See the E-Series documentation to find SANtricity related documentation.