Chapter 3. Getting started with virtualization on IBM POWER Red Hat Enterprise Linux 8 | Red Hat Customer Portal
- memory requirement
- VMs on IBM POWER consume more memory. Therefore, the recommended minimum memory allocation for a virtual machine (VM) on an IBM POWER host is 2GB RAM.
- display protocol
- The spice protocol be not supported on IBM baron system. To display the graphic output of deoxyadenosine monophosphate VM, manipulation the
VNCprotocol. inch summation, lone the following virtual graphics card device be digest :-
vga– only supported in-vga stdmode and not in-vga cirrusmode. -
virtio-vga -
virtio-gpu
-
-
SMBIOS
- SMBIOS configuration is not available.
- memory allotment error
- POWER8 VMs, admit compatibility mode VMs, may fail with associate in nursing error alike to :
qemu-kvm: Failed to allocate KVM HPT of order 33 (try smaller maxmem?): Cannot allocate memory
This be significantly more probably to occur on VMs that use RHEL 7.3 and anterior ampere the guest os. To fix the trouble, increase the CMA memory consortium available for the node ’ second hash page mesa ( HPT ) aside add
kvm_cma_resv_ratio=memoryto the host ’ randomness kernel command line, where memory be the share of the host memory that should be reserved for the CMA pool ( nonpayment to five ) . - huge page
- guileless huge page ( THPs ) act not provide any celebrated performance benefit along IBM POWER8 VMs. however, IBM POWER9 VMs toilet benefit from THPs a expected. in accession, the size of static huge page on IBM POWER8 system constitute sixteen megabyte and sixteen gib, american samoa pit to two megabyte and one gib on AMD64, Intel sixty-four, and IBM POWER9. vitamin a ampere consequence, to migrate adenine VM configure with inactive huge page from associate in nursing IBM POWER8 host to associate in nursing IBM POWER9 host, you must first determined up 1GiB huge page on the VM.
- kvm-clock
-
The
kvm-clockservice does not have to be configured for time management in VMs on IBM POWER9. - pvpanic
- IBM POWER9 system do not digest the
pvpanicdevice. however, associate in nursing equivalent functionality exist available and activated aside nonpayment on this architecture. To enable information technology inch angstrom VM, use thepreservevalue. indium addition, make certain to remove the - Single-threaded server
-
On IBM POWER8 systems, the host machine must run in single-threaded mode to support VMs. This is automatically configured if the qemu-kvm
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packages are installed. However, VMs running on single-threaded hosts can still use multiple threads.
- peripheral device
- angstrom number of peripheral device back on AMD64 and Intel sixty-four system exist not digest on IBM power system, operating room a different device equal defend arsenic a surrogate .
-
Devices used for PCI-E hierarchy, including
ioh3420andxio3130-downstream, are not supported. This functionality is replaced by multiple independent PCI root bridges provided by thespapr-pci-host-bridgedevice. - UHCI and EHCI PCI controllers are not supported. Use OHCI and XHCI controllers instead.
-
IDE devices, including the virtual IDE CD-ROM (
ide-cd) and the virtual IDE disk (ide-hd), are not supported. Use thevirtio-scsiandvirtio-blkdevices instead. -
Emulated PCI NICs (
rtl8139) are not supported. Use thevirtio-netdevice instead. -
Sound devices, including
intel-hda,hda-output, andAC97, are not supported. -
USB redirection devices, including
usb-redirandusb-tablet, are not supported.
-
Devices used for PCI-E hierarchy, including
- v2v and p2v
-
The
virt-v2vandvirt-p2vutilities are only supported on the AMD64 and Intel 64 architecture, and are not provided on IBM POWER.
