dmidecode 是一个工具或命令，以人类可读的格式检索系统硬件的有用信息。dmidecode 可用于所有类似 Linux 的系统 (RHEL, CentOS, Debian 和 SUSE)。dmidecode 代表 DMI (Desktop Management Interface) 它从 DMI 表中读取数据，并以人类可读的格式展示给我们。DMI 表保存了系统硬件的详细信息，如 BIOS，序列号，RAM 和 CPU 详细信息等，除此之外，dmidecode 还可以检索关于系统支持的最大配置的详细信息。
在本文中，我们将介绍 12 个Linux 系统下 dmidecode 相关示例。
1) dmidecode 命令输出
When we run the dmidecode command then it displays the output on the
screen, in the output we have the records, each record has 4 different
values.
当我们运行 dmidecode 命令时，会在屏幕上输出记录，每个记录有 4 个不同的值。
- Handle – 唯一标识符号
- Type – 它讲述的是硬件组成，在下面的示例中，DMI 类型 38 指的是 IPMI 设备
- Size – 记录大小
- Decoded value – 关于记录类型的信息，在下面的示例中，IPMI 设备的解码值是接口类型，规格版本，基址和寄存器间距
让我们运行 dmidecode 命令
[root@linuxtechi ~]# dmidecode | more输出如下所示
2) 用于 dmidecode 命令不同的 DMI 类型
以下是 dmidecode 命令中使用的 DMI 类型
Type Information
--------------------------------------------
0 BIOS
1 System
2 Baseboard
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 Access31 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
40 Additional Information
41 Onboard Devices Extended Information
42 Management Controller Host InterfaceKeyword Types
------------------------------
bios 0, 13
system 1, 12, 15, 23, 32
baseboard 2, 10, 41
chassis 3
processor 4
memory 5, 6, 16, 17
cache 7
connector 8
slot 93) 使用类型 id 显示硬件信息
在 dmidecode 命令中，我们可以使用关键字或类型 id 来获取系统的硬件信息。在例 2 中，我们已经列出了关键字及其类型 id。让我们假设我们想要显示系统的 cache 信息，然后我们可以运行下面的任何命令
[root@linuxtechi ~]# dmidecode -t cache
Or
[root@linuxtechi ~]# dmidecode -t 7
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x009C, 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: 192 kB
Maximum Size: 192 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Data
Associativity: 8-way Set-associative
Handle 0x009D, 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: 192 kB
Maximum Size: 192 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Instruction
Associativity: 4-way Set-associative
…………………………………………………………………………4) 显示 BIOS 信息
运行 dmidecode 命令后输入 bios 作为类型
[root@linuxtechi ~]# dmidecode --type bios
Or
[root@linuxtechi ~]# dmidecode -t bios
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x0005, DMI type 0, 24 bytes
BIOS Information
Vendor: Intel Corp.
Version: QSSC-S4R.QCI.01.00.0037.061120141015
Release Date: 06/11/2014
Address: 0xF0000
Runtime Size: 64 kB
ROM Size: 16384 kB
Characteristics:
PCI is supported
PNP is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
EDD is supported
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)
CGA/mono video services are supported (int 10h)
ACPI is supported
USB legacy is supported
LS-120 boot is supported
ATAPI Zip drive boot is supported
Function key-initiated network boot is supported
Targeted content distribution is supported
BIOS Revision: 17.18
Firmware Revision: 0.05) 显示机箱硬件信息
执行以下 dmidecode 命令显示机箱信息
[root@linuxtechi ~]# dmidecode -t chassis
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x0004, DMI type 3, 22 bytes
Chassis Information
Manufacturer: ..............................
Type: Main Server Chassis
Lock: Not Present
Version: 32S4RCS0010
Serial Number: QTFCVR1110136
Asset Tag: ....................
Boot-up State: Safe
Power Supply State: Safe
Thermal State: Safe
Security Status: Unknown
OEM Information: 0x01000181
Height: 1 U
Number Of Power Cords: 1
Contained Elements: 0
SKU Number: Not Specified6) 显示底板硬件信息
执行下面的 dmidecode 命令来显示关于系统底板的硬件信息
[root@linuxtechi ~]# dmidecode -t baseboard
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x0003, DMI type 2, 16 bytes
Base Board Information
Manufacturer: QCI
Product Name: QSSC-S4R
Version: 31S4RMB00B0
Serial Number: LVR1340271
Asset Tag: ....................
Features:
Board is a hosting board
Board is replaceable
Location In Chassis: Not Specified
Chassis Handle: 0x0004
Type: Motherboard
Contained Object Handles: 0
Handle 0x0027, DMI type 10, 6 bytes
On Board Device Information
Type: Video
Status: Enabled
Description: ServerEngines Pilot II
Handle 0x0028, DMI type 10, 6 bytes
On Board Device Information
Type: Ethernet
Status: Enabled
Description: Intel Dual GbE #1
Handle 0x0029, DMI type 10, 6 bytes
On Board Device Information
Type: Ethernet
Status: Enabled
Description: Intel Dual GbE #2
Handle 0x002A, DMI type 10, 6 bytes
On Board Device Information
Type: SATA Controller
Status: Enabled
Description: ICH10 Integrated SATA Controller7) 显示系统的硬件信息
要显示有关系统的硬件信息(制造商、产品名称和序列号等)，运行以下 dmidecode 命令
[root@linuxtechi ~]# dmidecode -t system
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x0002, DMI type 1, 27 bytes
System Information
Manufacturer: QCI
Product Name: QSSC-S4R
Version: ....................
Serial Number: ............
UUID: 2DD583E2-4A58-11E0-A580-00101859A783
Wake-up Type: AC Power Restored
SKU Number: Not Specified
Family: Not Specified
Handle 0x002C, DMI type 12, 5 bytes
System Configuration Options
Option 1: J5C3 2-3: Close to clear Password
Handle 0x002D, DMI type 12, 5 bytes
System Configuration Options
Option 1: J5C2 2-3: Close to clear CMOS
Handle 0x002E, DMI type 12, 5 bytes
System Configuration Options
Option 1: J6D1 2-3: Close for BIOS Recovery
Handle 0x002F, DMI type 12, 5 bytes
System Configuration Options
Option 1: J5C1 2-3: Close to Force ME Update Mode
Handle 0x0030, DMI type 12, 5 bytes
System Configuration Options
Option 1: J9C3: SATA RAID Key
Handle 0x0031, DMI type 12, 5 bytes
System Configuration Options
Option 1: J5A1 2-3: Close to Force BMC Update Mode
Handle 0x0034, DMI type 32, 20 bytes
System Boot Information
Status: No errors detected8) 显示已安装的内存信息
要显示有关已安装的物理内存（RAM）的信息，请运行以下命令
[root@linuxtechi ~]# dmidecode -t 17
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x0043, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0035
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 72 bits
Size: 4096 MB
Form Factor: DIMM
Set: 1
Locator: DIMM_1B
Bank Locator: MEM1 SLOT
Type: DDR3
Type Detail: Synchronous
Speed: 1067 MHz
Manufacturer: 0x0198
Serial Number: 0xA504DB27
Asset Tag: Unknown
Part Number: 9965426-047.A00LF
Handle 0x0045, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0035
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 72 bits
Size: 4096 MB
Form Factor: DIMM
Set: 2
Locator: DIMM_1A
Bank Locator: MEM1 SLOT
Type: DDR3
Type Detail: Synchronous
Speed: 1067 MHz
Manufacturer: 0x830B
Serial Number: 0x6C443023
…………………………………………………………使用下面的 dmidecode 命令查找系统支持的最大物理内存
[root@linuxtechi ~]# dmidecode -t 16
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x0035, DMI type 16, 15 bytes
Physical Memory Array
Location: Proprietary Add-on Card
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 256 GB
Error Information Handle: Not Provided
Number Of Devices: 8
Handle 0x0037, DMI type 16, 15 bytes
Physical Memory Array
Location: Proprietary Add-on Card
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 256 GB
Error Information Handle: Not Provided
Number Of Devices: 8
Handle 0x0039, DMI type 16, 15 bytes
Physical Memory Array
Location: Proprietary Add-on Card
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 256 GB
Error Information Handle: Not Provided
Number Of Devices: 8
……………………………………………………………9) 显示关于处理器的硬件信息
执行以下 dmidecode 命令显示处理器或 CPU 插座的硬件信息
[root@linuxtechi ~]# dmidecode -t processor
or
[root@linuxtechi ~]# dmidecode -t 4
# dmidecode 2.12
SMBIOS 2.5 present.
Handle 0x009B, DMI type 4, 40 bytes
Processor Information
Socket Designation: CPU1
Type: Central Processor
Family: Xeon MP
Manufacturer: Intel(R) Corporation
ID: E6 06 02 00 FF FB EB BF
Signature: Type 0, Family 6, Model 46, Stepping 6
Flags:
FPU (Floating-point unit on-chip)
VME (Virtual mode extension)
DE (Debugging extension)
PSE (Page size extension)
TSC (Time stamp counter)
MSR (Model specific registers)
PAE (Physical address extension)
MCE (Machine check exception)
CX8 (CMPXCHG8 instruction supported)
APIC (On-chip APIC hardware supported)
SEP (Fast system call)
MTRR (Memory type range registers)
PGE (Page global enable)
MCA (Machine check architecture)
CMOV (Conditional move instruction supported)
PAT (Page attribute table)
PSE-36 (36-bit page size extension)
CLFSH (CLFLUSH instruction supported)
DS (Debug store)
ACPI (ACPI supported)
MMX (MMX technology supported)
FXSR (FXSAVE and FXSTOR instructions supported)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Multi-threading)
TM (Thermal monitor supported)
PBE (Pending break enabled)
Version: Intel(R) Xeon(R) CPU E7540 @ 2.00GHz
Voltage: 1.2 V
External Clock: 133 MHz
Max Speed: 4000 MHz
Current Speed: 2000 MHz
Status: Populated, Enabled
Upgrade: Socket LGA1567
L1 Cache Handle: 0x009D
L2 Cache Handle: 0x009E
L3 Cache Handle: 0x009F
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Core Count: 6
Core Enabled: 6
Thread Count: 12
Characteristics:
64-bit capable
…………………………………………………10) 显示有关 64 位内存错误的信息
要显示系统的 64 位内存错误信息，请运行以下命令
[root@linuxtechi ~]# dmidecode -t 3311) 以十六进制输出 DMIDECODE 命令输出
如果您不想解码 dmidecode 命令的输出信息，但希望将其转储为 16 进制格式，则可以在 dmidecode 命令中使用 -u 或 dump 选项，示例如下
[root@linuxtechi ~]# dmidecode -u -t 4
or
[root@linuxtechi ~]# dmidecode --dump -t 412 ) 显示 dmidecode 版本
使用下面的 dmidecode 命令显示它的版本
[root@linuxtechi ~]# dmidecode -V
2.12
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