Is Microsoft Hyper-V Virtualization Supported?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

Issue

  • Does Red Hat Enterprise Linux include para-virtualized drivers built-in for use as a guest on a Microsoft Hyper-V host?

Resolution

Red Hat Enterprise Linux 5

Beginning with Red Hat Enterprise Linux 5.9, the Microsoft Linux Integration Services (LIS) drivers are now built-in to a base installation of the RHEL 5 guest on a Microsoft Hyper-V host.

The following para-virtualized use cases have been tested by both Red Hat and Microsoft for joint support:

  • All fresh installations of Red Hat Enterprise Linux 5.9
  • Upgrades from Red Hat Enterprise Linux 5.8 guests with Microsoft provided LIS version 3.4 to Red Hat Enterprise Linux 5.9 guests with built-in para-virtualized drivers

The following use cases are not supported by both Red Hat and Microsoft:

  • Upgrades from fully virtualized (no LIS drivers) Red Hat Enterprise Linux 5.8 guests to Red Hat Enterprise Linux 5.9 guests with built-in para-virtualized drivers

NOTE: Customers can continue to install and utilize the LIS drivers provided and supported by Microsoft.

Known Issue, as documented in the Red Hat Enterprise Linux 5.9 Tech Notes:

"When running Red Hat Enterprise Linux 5 with an older kernel in a Microsoft Hyper-V virtualization guest, mkinitrd does not include the Microsoft Hyper-V drivers when asked to generate the initial RAM disk for a Red Hat Enterprise Linux 5.9 kernel or later. This causes a kernel panic when the guest is rebooted with such a kernel as there is no driver available for the storage hosting the guest's root file system. To work around this problem, run the mkinitrd utility with either the --preload option that loads the module before any SCSI modules are loaded, or with the --with option that loads the module after SCSI modules are loaded."

  • Note that you will need to use the --preload syntax for each module specific to Micrsoft Hyper-V, for instance:
# bash -x mkinitrd --preload=hv_storvsc --preload=hv_vmbus -v -f initrd-`uname -r`.img `uname -r`

Red Hat Enterprise Linux 6

Red Hat Enterprise Linux 6.4 adds support for all Microsoft Hyper-V para-virtualized drivers as well as adds installer support. The Red Hat Enterprise Linux guest installer recognizes the underlying Hyper-V hypervisor and installs the relevant para-virtualized drivers. This streamlines installation and vastly improves usability when running as a guest on Microsoft Hyper-V.

This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.

Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.