我在 HP ProLiant BL460c G7 刀片服务器上运行 CentOS 6.4。我在 HP 刀片服务器上安装了 6 * 8GB DIMM 内存。
当我使用 dmidecode --type memory 时，我得到以下输出
Handle 0x1000, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 192 GB
Error Information Handle: Not Provided
Number Of Devices: 6
Handle 0x1001, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 192 GB
Error Information Handle: Not Provided
Number Of Devices: 6
Handle 0x1100, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 1
Locator: PROC 1 DIMM 1D
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x1101, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: 2
Locator: PROC 1 DIMM 2A
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x1102, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 3
Locator: PROC 1 DIMM 3E
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x1103, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: 4
Locator: PROC 1 DIMM 4B
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x1104, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 5
Locator: PROC 1 DIMM 5F
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x1105, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: 6
Locator: PROC 1 DIMM 6C
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x1106, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1001
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 7
Locator: PROC 2 DIMM 1D
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x1107, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1001
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: 8
Locator: PROC 2 DIMM 2A
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x1108, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1001
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 9
Locator: PROC 2 DIMM 3E
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x1109, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1001
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: 10
Locator: PROC 2 DIMM 4B
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x110A, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1001
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 11
Locator: PROC 2 DIMM 5F
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x110B, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x1001
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: 12
Locator: PROC 2 DIMM 6C
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: 2
Configured Clock Speed: 1333 MHz
但当我输入 free -m 时，它只显示 16GB。我不明白这里的问题是什么。请帮忙。
total used free shared buffers cached
Mem: 15914 4697 11216 0 226 3385
-/+ buffers/cache: 1085 14828
Swap: 18095 52 18043
答案1
您必须使用 64 位系统来寻址那么多的主内存。您之所以能够寻址超过 ~4G 的任何内存，这要归功于 PAE，这是一种逻辑上扩展 32 位系统内存映射的方法。如您所见，它的扩展范围并不大。
因此使用 amd64 发行版重新安装，您将能够处理其余内存。