就在昨天，我使用 Ubuntu 服务器 20.04.1 在我的家庭服务器上安装了新的 RAM 模块，我也在更换驱动器，因此我安装了全新的 Ubuntu 服务器，但不幸的是，Ubuntu 现在报告我有 16 GB 的可用 RAM，而不是 32 GB，但似乎它可以很好地识别 RAM。
lshw-C 内存：
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: P5.40
date: 07/03/2019
size: 64KiB
capacity: 16MiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi
*-memory
description: System Memory
physical id: 10
slot: System board or motherboard
size: 32GiB
*-bank:0
description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 1866 MHz (0.5 ns)
product: F4-3000C16-8GISB
vendor: Unknown
physical id: 0
serial: 00000000
slot: DIMM 0
size: 8GiB
width: 64 bits
clock: 1866MHz (0.5ns)
*-bank:1
description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 1866 MHz (0.5 ns)
product: F4-3000C16-8GISB
vendor: Unknown
physical id: 1
serial: 00000000
slot: DIMM 1
size: 8GiB
width: 64 bits
clock: 1866MHz (0.5ns)
*-bank:2
description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 1866 MHz (0.5 ns)
product: F4-3000C16-8GISB
vendor: Unknown
physical id: 2
serial: 00000000
slot: DIMM 0
size: 8GiB
width: 64 bits
clock: 1866MHz (0.5ns)
*-bank:3
description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 1866 MHz (0.5 ns)
product: F4-3000C16-8GISB
vendor: Unknown
physical id: 3
serial: 00000000
slot: DIMM 1
size: 8GiB
width: 64 bits
clock: 1866MHz (0.5ns)
*-cache:0
description: L1 cache
physical id: 12
slot: L1 - Cache
size: 768KiB
capacity: 768KiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 13
slot: L2 - Cache
size: 4MiB
capacity: 4MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 14
slot: L3 - Cache
size: 16MiB
capacity: 16MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=3
免费-m
total used free shared buff/cache available
Mem: 16004 1237 13455 1 1311 14507
Swap: 4095 0 4095
dmidcode --类型内存
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.2.1 present.
# SMBIOS implementations newer than version 3.2.0 are not
# fully supported by this version of dmidecode.
Handle 0x0010, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 128 GB
Error Information Handle: 0x000F
Number Of Devices: 4
Handle 0x0017, DMI type 17, 84 bytes
Memory Device
Array Handle: 0x0010
Error Information Handle: 0x0016
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL A
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 1866 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: F4-3000C16-8GISB
Rank: 2
Configured Memory Speed: 1866 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: <OUT OF SPEC>
Memory Operating Mode Capability: None
Firmware Version: Unknown
Module Manufacturer ID: Unknown
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: None
Cache Size: None
Logical Size: None
Handle 0x001A, DMI type 17, 84 bytes
Memory Device
Array Handle: 0x0010
Error Information Handle: 0x0019
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 1
Bank Locator: P0 CHANNEL A
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 1866 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: F4-3000C16-8GISB
Rank: 1
Configured Memory Speed: 1866 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: <OUT OF SPEC>
Memory Operating Mode Capability: None
Firmware Version: Unknown
Module Manufacturer ID: Unknown
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: None
Cache Size: None
Logical Size: None
Handle 0x001D, DMI type 17, 84 bytes
Memory Device
Array Handle: 0x0010
Error Information Handle: 0x001C
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL B
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 1866 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: F4-3000C16-8GISB
Rank: 2
Configured Memory Speed: 1866 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: <OUT OF SPEC>
Memory Operating Mode Capability: None
Firmware Version: Unknown
Module Manufacturer ID: Unknown
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: None
Cache Size: None
Logical Size: None
Handle 0x0020, DMI type 17, 84 bytes
Memory Device
Array Handle: 0x0010
Error Information Handle: 0x001F
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 1
Bank Locator: P0 CHANNEL B
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 1866 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: F4-3000C16-8GISB
Rank: 1
Configured Memory Speed: 1866 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Memory Technology: <OUT OF SPEC>
Memory Operating Mode Capability: None
Firmware Version: Unknown
Module Manufacturer ID: Unknown
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: None
Cache Size: None
Logical Size: None