How to retrieve hardware information using Dmidecode command
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To retrieve hardware information using Dmidecode command
In this article we will discuss about Dmidecode command and how it helps to retrieve hardware information. It works for RHEL/CentOS/Fedora/Ubuntu Linux and it reads DMI table for fetching data and displaying useful system informations.
Output of Demidecode
[root@linuxhelp ~]# dmidecode 2.12
# dmidecode 2.12
SMBIOS 2.6 present.
55 structures occupying 2257 bytes.
Table at 0x000EB170.
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
Vendor: Intel Corp.
Version: BEH6110H.86A.0044.2012.0531.1710
Release Date: 05/31/2012
Address: 0xF0000
Runtime Size: 64 kB
ROM Size: 1024 kB
Characteristics:
PCI is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
BIOS ROM is socketed
EDD is supported
5.25" /1.2 MB floppy services are supported (int 13h)
3.5" /720 kB floppy services are supported (int 13h)
3.5" /2.88 MB floppy services are supported (int 13h)
Print screen service is supported (int 5h)
8042 keyboard services are supported (int 9h)
Serial services are supported (int 14h)
Printer services are supported (int 17h)
ACPI is supported
USB legacy is supported
BIOS boot specification is supported
Targeted content distribution is supported
........... .............. ..............
........... .............. ..............
PME signal is supported
Bus Address: 0000:00:1c.4
Handle 0x0036, DMI type 127, 4 bytes
End Of Table
To get DMI types
-t or -type and id are used with Dmidecode to give the exact information and id 6 gives cache information.
[root@linuxhelp ~]# dmidecode -t 7
# dmidecode 2.12
SMBIOS 2.6 present.
Handle 0x0005, DMI type 7, 19 bytes
Cache Information
Socket Designation: L1-Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 32 kB
Maximum Size: 32 kB
Supported SRAM Types:
Other
Installed SRAM Type: Other
Speed: Unknown
Error Correction Type: None
System Type: Unified
Associativity: 8-way Set-associative
Handle 0x0006, DMI type 7, 19 bytes
Cache Information
Socket Designation: L2-Cache
Configuration: Enabled, Not Socketed, Level 2
Operational Mode: Varies With Memory Address
Location: Internal
Installed Size: 1024 kB
Maximum Size: 1024 kB
Supported SRAM Types:
Other
Installed SRAM Type: Other
Speed: Unknown
Error Correction Type: None
System Type: Unified
Associativity: 8-way Set-associative
Handle 0x0007, DMI type 7, 19 bytes
Cache Information
Socket Designation: L3-Cache
Configuration: Enabled, Not Socketed, Level 3
Operational Mode: Unknown
Location: Internal
Installed Size: 6144 kB
Maximum Size: 6144 kB
Supported SRAM Types:
Other
Installed SRAM Type: Other
Speed: Unknown
Error Correction Type: None
System Type: Unified
Associativity: Other
For DMI type details
[root@linuxhelp ~]# dmidecode --type
Type Information
----------------------------------------
0 BIOS
1 System
2 Base Board
3 Chassis
4 Processor
5 Memory Controller
6 Memory Module
7 Cache
8 Port Connector
9 System Slots
10 On Board Devices
11 OEM Strings
12 System Configuration Options
13 BIOS Language
14 Group Associations
15 System Event Log
16 Physical Memory Array
17 Memory Device
18 32-bit Memory Error
19 Memory Array Mapped Address
20 Memory Device Mapped Address
21 Built-in Pointing Device
22 Portable Battery
23 System Reset
24 Hardware Security
25 System Power Controls
26 Voltage Probe
27 Cooling Device
28 Temperature Probe
29 Electrical Current Probe
30 Out-of-band Remote Access
31 Boot Integrity Services
32 System Boot
33 64-bit Memory Error
34 Management Device
35 Management Device Component
36 Management Device Threshold Data
37 Memory Channel
38 IPMI Device
39 Power Supply
To list the available keywords
To list the available keywords -t arguement is used with dmidecode command as follows.
[root@linuxhelp ~]# dmidecode -t
Keyword Types
------------------------------
bios 0, 13
system 1, 12, 15, 23, 32
baseboard 2, 10
chassis 3
processor 4
memory 5, 6, 16, 17
cache 7
connector 8
slot 9
To Get Memory Information
[root@linuxhelp ~]# dmidecode -t 16
# dmidecode 2.12
SMBIOS 2.6 present.
Handle 0x0027, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 32 GB
Error Information Handle: No Error
Number Of Devices: 2
To get BIOS information
[root@linuxhelp ~]# dmidecode -t bios
# dmidecode 2.12
SMBIOS 2.6 present.
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
Vendor: Intel Corp.
Version: BEH6110H.86A.0044.2012.0531.1710
Release Date: 05/31/2012
Address: 0xF0000
Runtime Size: 64 kB
ROM Size: 1024 kB
Characteristics:
PCI is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
BIOS ROM is socketed
EDD is supported
5.25" /1.2 MB floppy services are supported (int 13h)
3.5" /720 kB floppy services are supported (int 13h)
3.5" /2.88 MB floppy services are supported (int 13h)
Print screen service is supported (int 5h)
8042 keyboard services are supported (int 9h)
Serial services are supported (int 14h)
Printer services are supported (int 17h)
ACPI is supported
USB legacy is supported
BIOS boot specification is supported
Targeted content distribution is supported
Handle 0x0026, DMI type 13, 22 bytes
BIOS Language Information
Language Description Format: Long
Installable Languages: 1
en|US|iso8859-1
Currently Installed Language: en|US|iso8859-1
To get the Manufacturer, Model and Serial Number
[root@linuxhelp ~]# dmidecode -t system
# dmidecode 2.12
SMBIOS 2.6 present.
Handle 0x0025, DMI type 12, 5 bytes
System Configuration Options
Option 1: To Be Filled By O.E.M.
Handle 0x0030, DMI type 32, 20 bytes
System Boot Information
Status: No errors detected
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer:
Product Name:
Version:
Serial Number:
UUID: 6947584C-8709-E211-8BE6-505054503030
Wake-up Type: Power Switch
SKU Number: Not Specified
Family: Not Specified
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