# Hardware Compatibility List (HCL)

Devices listed on Citrix Hypervisor's Hardware Compatibility List (opens new window) are supported.

For other hardware, see Unlisted Hardware.

# Unlisted Hardware

Many devices outside the HCL in fact work very well with XCP-ng. Being outside the HCL means that there have been not tests to ensure that they work. Most of the hardware support depends on the Linux kernel and thus support for hardware outside the HCL depends on on how well the drivers are supported by the Linux kernel included in XCP-ng.

This section is a community-enriched list of pieces of hardware that do not belong to the HCL, along with information about how well they work (or not), workarounds, etc.

# Supermicro / AMD EPYC CPU

Reference: https://xcp-ng.org/forum/topic/350/amd-epyc-compatible (opens new window)

EPYC CPUs are working well on XCP-ng, but people with SuperMicro motherboard saw random reboot sometimes. Turning off the C-state control solved the issue:

In BIOS:

  • Advanced -> CPU Configuration -> Global C-state Control: Disabled
  • Advanced -> North Bridge -> Determinism Slider: Performance

# Network Cards

# Emulex Corporation OneConnect NIC (Skyhawk) (rev 10) - 10Gbps NIC "OCe14102-NT"

Current State: Works, but sporadic card/port lockups - avoid in production!

Known to work (relatively stable) with latest Firmware 11.2.1153.23 on XCP-ng 7.5

Known Issues (with old firmware; also on XenServer 7.2 with current firmware)

  • Card Lockup
    • pulling the network cable puts the card in a locked state, LED's keeps flashing; putting the cable back does nothing; network connection stays lost
    • Solutions
      • Short Term: power off the host and pull power cords (the card needs to be completely powerless!, just switching the host OFF is not enough)
      • Mid Term: Upgrade Firmware to match XCP-ng Driver version (for XCP-ng 7.5 -> 11.2.XXXXX)
      • Long Term: Avoid Emulex cards!

# Broadcom Netxtreme II BCM57711E

(or BCM5709 or ...)

On XCP-ng <= 8.0, using default bnx2x driver triggers a kernel Oops on XCP-ng (no ping and freezing the host):

Fixed drivers have been released as official updates.

# Alternate drivers

XCP-ng occasionally provides alternate drivers for users who have issues with the main drivers installed with XCP-ng.

Those driver packages can be installed alongside the main packages and will take precedence gracefully.

Note: there is another way, albeit more experimental, to use alternate drivers: use our experimental alternate kernel (see dedicated section below).

In this section we provide instructions that are common to all the provided drivers.

Just replace package-name with the actual package name.

# Installation

yum install package-name

# Activation

The simplest way is to reboot.

Else, if you know the module name, you can unload it from the kernel and reload it.

modprobe -r module-name
modprobe -v module-name

# Uninstallation

If the driver does not work as intended, just remove the package from the system and follow the "Activation" steps above.

yum remove package-name

# Updates

The alternate drivers may get updated to newer versions when the system is updated or upgraded. If that causes regressions, please open a bug report.

# System Upgrades

Upgrades using the installation ISO will not retain the alternate driver package, so remember to re-install it after the upgrade if it's still needed (the main driver may have been updated too and make the alternate driver useless in your case).

Upgrades using the yum method will retain the alternate driver package, unless we stop providing it (usually, because the main driver will have been updated too). If the alternate driver is retained, it may have changed versions, so you may still need to consider going back to the main driver. If after an upgrade no driver works correctly for your system anymore, open a bug report.

# Network drivers list

A list is maintained at https://github.com/xcp-ng/xcp/wiki/Drivers (opens new window)

Check the "XCP-ng X.Y alternate driver" column, which provides packages names and versions for every available alternate driver.

# Additional kernel modules

Additional kernel modules are a lot like alternate drivers (most of the above section applies to them) except that they don't replace an existing driver from the system. They add a new one that didn't exist at all.

Their list is maintained at https://github.com/xcp-ng/xcp/wiki/Drivers (opens new window), in a table named "Other kernel modules available in XCP-ng X.Y".

# Alternate kernel

We provide an "alternate Linux kernel" on XCP-ng 8.0 and above, named kernel-alt. It is kernel 4.19, as the main kernel, but with all updates from the Linux 4.19 branch applied. By construction, it should thus be stable. However it receives less testing so we cannot fully guarantee against regressions (any detected regression we'd work on a fix quickly, of course). We also backport security fixes from the main kernel to the alternate kernel when needed.

This kernel is mainly targeted at:

  • Testing whether kernel.org fixes situations where the main kernel and drivers have issues on specific hardware.
  • Allowing a system to work temporarily when the main kernel has an issue regarding your specific hardware, until we can fix the main kernel. For this to happen, you need to tell us if you are in a situation where the main kernel doesn't work whereas the alternate kernel does!

Report issues here (opens new window).

# During system installation

  • In BIOS mode, press F2 at early boot stage when offered the choice then type install-alt.
  • In UEFI mode, select the boot option mentioning the alternate kernel from the grub menu.

This will boot the installer with the alternate kernel and also install the alternate kernel on the system in addition to the main one (but will not make the alternate kernel the default boot option for the installed system).

# Installation on an existing system

You can install it using

yum install kernel-alt

This will install the kernel and add a grub boot menu entry to boot from it. It will not default to it unless you change the default in grub.cfg (/boot/grub/grub.cfgor/boot/efi/EFI/xenserver/grub.cfg` depending on whether you are in BIOS mode or UEFI mode).

There may also be a newer release of kernel-alt in testing repositories:

yum install kernel-alt --enablerepo=xcp-ng-testing

# Uninstall

Boot the main kernel, then:

yum remove kernel-alt

This will remove the added grub entry automatically too and set default boot to main kernel if needed.