The built-in Red Hat Enterprise Linux Integration Services drivers for Hyper-V (available since Red Hat Enterprise Linux 6.4) are sufficient for Red Hat Enterprise Linux guests to run using the high performance synthetic devices on Hyper-V hosts.These built-in drivers are certified by Red Hat for this use.

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3. The output of sosreport is the common starting point for Red Hat support engineers when performing an initial analysis of a service request for a Red Hat Enterprise Linux system. The utility provides a standardized way to collect diagnostic information that your Red Hat support engineer will reference throughout their investigation of issues.
4. 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.

Applies To: Azure Stack HCI, version 20H2; Windows Server 2019, Hyper-V Server 2019, Windows Server 2016,Hyper-V Server 2016, Windows Server 2012 R2, Hyper-V Server 2012 R2, Windows10, Windows 8.1

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The following feature distribution maps indicate the features that are presentin built-in and downloadable versions of Linux Integration Services. The knownissues and workarounds for each distribution are listed after the tables.

The built-in Red Hat Enterprise Linux Integration Services drivers for Hyper-V(available since Red Hat Enterprise Linux 6.4) are sufficient for Red HatEnterprise Linux guests to run using the high performance synthetic devices onHyper-V hosts.These built-in drivers are certified by Red Hat for this use.Certified configurations can be viewed on this Red Hat web page: Red HatCertificationCatalog.It isn't necessary to download and install Linux Integration Services packagesfrom the Microsoft Download Center, and doing so may limit your Red Hat supportas described in Red Hat Knowledgebase article 1067: Red Hat Knowledgebase1067.

Because of potential conflicts between the built-in LIS support and thedownloadable LIS support when you upgrade the kernel, disable automatic updates,uninstall the LIS downloadable packages, update the kernel, reboot, and theninstall the latest LIS release, and reboot again.

[!NOTE] Official Red Hat Enterprise Linux certification information isavailable through the Red Hat CustomerPortal.

In this section:

Table legend

• Built in - LIS are included as part of this Linux distribution. Thekernel module version numbers for the built in LIS (as shown by lsmod,for example) are different from the version number on the Microsoft-providedLIS download package. A mismatch does not indicate that the built in LIS isout of date.

• ✔ - Feature available

• (blank) - Feature not available

RHEL/CentOS 8.x Series

RHEL/CentOS 7.x Series

This series only has 64-bit kernels.

RHEL/CentOS 6.x Series

The 32-bit kernel for this series is PAE enabled. There is no built-in LISsupport for RHEL/CentOS 6.0-6.3.

RHEL/CentOS 5.x Series

This series has a supported 32-bit PAE kernel available. There is no built-inLIS support for RHEL/CentOS before 5.9.

Notes

1. For this RHEL/CentOS release, VLAN tagging works but VLAN trunking does not.

2. Static IP injection may not work if Network Manager has been configured fora given synthetic network adapter on the virtual machine. For smoothfunctioning of static IP injection please make sure that either NetworkManager is either turned off completely or has been turned off for aspecific network adapter through its ifcfg-ethX file.

3. On Windows Server 2012 R2 while using virtual fibre channel devices, makesure that logical unit number 0 (LUN 0) has been populated. If LUN 0 has notbeen populated, a Linux virtual machine might not be able to mount fibrechannel devices natively.

4. For built-in LIS, the 'hyperv-daemons' package must be installed for thisfunctionality.

5. If there are open file handles during a live virtual machine backupoperation, then in some corner cases, the backed-up VHDs might have toundergo a file system consistency check (fsck) on restore. Live backupoperations can fail silently if the virtual machine has an attached iSCSIdevice or direct-attached storage (also known as a pass-through disk).

6. While the Linux Integration Services download is preferred, live backupsupport for RHEL/CentOS 5.9 - 5.11/6.4/6.5 is also available throughHyper-V Backup Essentials forLinux.

7. Dynamic memory support is only available on 64-bit virtual machines.

8. Hot-Add support is not enabled by default in this distribution. To enableHot-Add support you need to add a udev rule under /etc/udev/rules.d/ asfollows:

   

9. Create a file /etc/udev/rules.d/100-balloon.rules. You may use any otherdesired name for the file.

10. Add the following content to the file: SUBSYSTEM'memory', ACTION'add', ATTR{state}='online'

11. Reboot the system to enable Hot-Add support.

While the Linux Integration Services download creates this rule on installation,the rule is also removed when LIS is uninstalled, so the rule must be recreatedif dynamic memory is needed after uninstallation.

1. Dynamic memory operations can fail if the guest operating system is runningtoo low on memory. The following are some best practices:

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• Startup memory and minimal memory should be equal to or greater than theamount of memory that the distribution vendor recommends.

• Applications that tend to consume the entire available memory on a systemare limited to consuming up to 80 percent of available RAM.

1. If you are using Dynamic Memory on a Windows Server 2016 or Windows Server2012 R2 operating system, specify Startup memory, Minimum memory,and Maximum memory parameters in multiples of 128 megabytes (MB).Failure to do so can lead to hot-add failures, and you may not see anymemory increase in a guest operating system.

2. Certain distributions, including those using LIS 4.0 and 4.1, only provideBallooning support and do not provide Hot-Add support. In such a scenario,the dynamic memory feature can be used by setting the Startup memoryparameter to a value which is equal to the Maximum memory parameter. Thisresults in all the requisite memory being Hot-Added to the virtual machineat boot time and then later depending upon the memory requirements of thehost, Hyper-V can freely allocate or deallocate memory from the guest usingBallooning. Please configure Startup Memory and Minimum Memory at orabove the recommended value for the distribution.

3. To enable key/value pair (KVP) infrastructure, install the hypervkvpd orhyperv-daemons rpm package from your RHEL ISO. Alternatively the package canbe installed directly from RHEL repositories.

4. The key/value pair (KVP) infrastructure might not function correctly withouta Linux software update. Contact your distribution vendor to obtain thesoftware update in case you see problems with this feature.

5. On Windows Server 2012 R2 Generation 2 virtual machines have secure bootenabled by default and some Linux virtual machines will not boot unless thesecure boot option is disabled. You can disable secure boot in theFirmware section of the settings for the virtual machine in Hyper-VManager or you can disable it using Powershell:

• Set-VMFirmware -VMName 'VMname' -EnableSecureBoot Off

  The Linux Integration Services download can be applied to existingGeneration 2 VMs but does not impart Generation 2 capability.

1. In Red Hat Enterprise Linux or CentOS 5.2, 5.3, and 5.4 the filesystemfreeze functionality is not available, so Live Virtual Machine Backup isalso not available.

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See Also