Feature pages are design documents that developers have created while collaborating on oVirt.

Most of them are outdated, but provide historical design context.

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Host’s Bios Information


When assigning new host to oVirt engine the engine retrieves general information about the host. This information includes Vdsm version, CPU units and inc. This article describes the bios information that the host provides to oVirt engine.


  • Name: Yaniv Bronhaim (ybronhei)
  • Email:

Current status

  • Target Release: 3.2
  • Status: Work In Progress
  • Last updated date: Nov 20 2012

Detailed Description

The following feature allows the user interface to present host’s bios information when adding new hypervisor. This information is taken by using dmidecode command, this command runs with root permissions over the host and returns the information with getVdsBiosInfo API method. This returns the following fields[1]:

  1. Host Manufacturer - Manufacturer of the host’s machine and bios’ vendor (e.g LENOVO)

    1. Host Version - For each host the manufacturer gives a unique name (e.g. Lenovo T420s)
    2. Host Product Name - ID of the product - same for all similar products (e.g 4174BH4)
    3. Host UUID - Unique ID for each host (e.g E03DD601-5219-11CB-BB3F-892313086897)
    4. Host Family - Type of host’s CPU - (e.g Core i5)
    5. Host Serial Number - Unique ID for host’s chassis (e.g R9M4N4G)

The following parameters below are suggested to be added:

  7. BIOS Revision
  8. BIOS Version
  9. BIOS is upgradable
  10. BIOS Vendor
  11. BIOS Release Date

  12. Processor Version
  13. Processor Core Count
  14. Processor Vendor
  15. Processor Core Enabled
  16. Processor Current Speed
  17. Processor Max Speed
  18. Processor Thread Count

  19. Chassis Asset Tag
  20. Chassis Serial Number
  21. Chassis Manufacturer

  22. Memory Serial Number
  23. Memory Total Width
  24. Memory Number of Devices
  25. Memory Manufacturer
  26. Memory Data Width
  27. Memory Error Correction Type
  28. Memory Maximum Capacity
  29. Memory Type Detail
  30. Memory Speed
  31. Memory Size

[1] More parameters can be added on request.

User Experience

Under Hosts tab we have general information about the chosen host. In this tab you see general information that was retrieved from the host: This feature adds new host’s sub-tab called BIOS Information. BIOS Information will display the following fields:


When Vdsm receives getVdsBiosInfo request, it retrieves the bios information by using python-dmidecode utility. After collecting and arranging the information, Vdsm delivers it to engine by xml rpc.

Engine Flow

When refreshing host’s capabilities we call to getVdsBiosInfo, On update this information is written to the database to vds_dynamic table with other all host information.

Short explanation about vds tables: We have 3 tables that engine works with - vds_static, vds_dynamic, vds_statistics, all goes to one view that is called VDS vds_statistics includes fields that get updated every 2 sec (highest frequency) vds_static includes fields that get changed threw the UI like IP, CPU Cores (that can be specified by the user) and more configurable data. vds_dynamic includes host information that retrieved from specific vds Bios information needs to be part of the vds dynamic information and retrieved in constants intervals or cases by API request from host (as get capabilities) —- This information is mapped to Vds entity and kept there, when mapping to UI we use those parameters to build the Host entity.


The host’s bios parameters is shown via engine rest API under host object as the following:

` ``Dell Inc.` ` ``01` ` ``H2CQ95J` ` ``OptiPlex 790` ` ``4C4C4544-0032-4310-8051-C8C04F39354A` ` ``Core i7`

dmidecode Output

System Information

dmi_type - 1 SKU Number - Not Specified UUID - E03DD601-5219-11CB-BB3F-892313086897 Family - ThinkPad T420s Serial Number - R9M4N4G Version - ThinkPad T420s Wake-Up Type - Power Switch Product Name - 4174BH4 dmi_handle - 0x0010 dmi_size - 27 Manufacturer - LENOVO

Bios Information

NEC PC-98 - False EDD is supported - True PC Card (PCMCIA) is supported - False I2O boot - False 3.5”/2.88 MB floppy services are supported (int 13h) - False BIOS Revision - 1.31 ATAPI Zip drive boot - False Version - 8CET51WW (1.31 ) BIOS is upgradeable - True Smart battery - False 8042 keyboard services are supported (int 9h) - True BIOS shadowing is allowed - True BIOS ROM is socketed - False USB legacy - True APM is supported - False AGP - False PNP is supported - True VLB is supported - False Vendor - LENOVO ISA is supported - False Japanese floppy for Toshiba 1.2 MB is supported (int 13h) - False CGA/mono video services are supported (int 10h) - True Serial services are supported (int 14h) - True 5.25”/360 KB floppy services are supported (int 13h) - False Address - 0xe0000 ROM Size - 8192 KB Function key-initiated network boot - True Currently Installed Language - [‘en-US’] Runtime Size - 128 KB Targeted content distribution - False 3.5”/720 KB floppy services are supported (int 13h) - True Relase Date - 11/29/2011 BIOS boot specification - True MCA is supported - False PCI is supported - True 5.25”/1.2 MB floppy services are supported (int 13h) - False dmi_handle - 0x002d Selectable boot is supported - True dmi_type - 13 Japanese floppy for NEC 9800 1.2 MB is supported (int 13h) - False EISA is supported - False Print screen service is supported (int 5h) - True Boot from PC Card (PCMCIA) is supported - False Printer services are supported (int 17h) - True ESCD support is available - False dmi_size - 22 Boot from CD is supported - True Installed Languages - 1 ACPI - True LS-120 boot - False IEEE 1394 boot - False

Cache Information

dmi_type - 7 System Type - Data Socket Designation - L2-Cache Installed SRAM Type - [None, None, None, None, None, ‘Synchronous’, None] Level - 2 Socketed - False Associativity - 8-way Set-associative Supported SRAM Type - [None, None, None, None, None, ‘Synchronous’, None] Enabled - True Maximum Size - 256 KB dmi_handle - 0x0003v Installed Size - 256 KB Location - Internal Error Correction Type - Single-bit ECC Speed - Unknown Operational Mode - Write Through dmi_size - 19

Processor Information

Upgrade - ZIF Socket Socket Designation - CPU L2 Cache Handle - 0x0003 Version - Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz Type - Central Processor Core Count - 2 Status - Populated:Enabled Vendor - Intel(R) Corporation Core Enabled - 2 dmi_handle - 0x0001 External Clock - 100 Serial Number - Not Supported by CPU Current Speed - 2600 dmi_size - 42 L3 Cache Handle - 0x0004 Part Number - None Asset Tag - None Signature - None L1 Cache Handle - 0x0002 ID - a7 06 02 00 ff fb eb bf dmi_type - 4 Family - Characteristics - [‘64-bit capable’] Voltage - 1.2 V Max Speed - 2600 Thread Count - 4

Chassis Information

dmi_type - 3 Type - Notebook Power Supply State - Unknown Thermal State - Unknown Asset Tag - RH0003183 Serial Number - R9M4N4G Version - Not Available Lock - Not Present Security Status - Unknown Boot-Up State - Unknown dmi_handle - 0x0012 dmi_size - 21 Manufacturer - LENOVO

Memory Information

Use - System Memory Location - System Board Or Motherboard Type - Array Handle - 0x0005 Number Of Devices - 2 Serial Number - 340F5D7F Total Width - 64 bit Form Factor - SODIMM dmi_size - 15 Manufacturer - Kingston Data Width - 64 bit Part Number - 99U5428-046.A00LF AssetTag - 9876543210 Bank Locator - BANK 2 Error Correction Type - None dmi_handle - 0x0005 dmi_type - 16 Maximum Capacity - 16 GB Set - None Error Information Handle - Not Provided Locator - ChannelB-DIMM0 Type Detail - [None, None, None, None, None, None, ‘Synchronous’, None, None, None, None, None] Speed - 1333 MHz (0.8ns) Size - 4096 MB