我有一台运行的服务器，无需物理访问。我认为安装了 16Gb 内存，但我不确定。这里可能有什么问题？
#dmidecode -t memory
# dmidecode 3.0
Scanning /dev/mem for entry point.
SMBIOS 2.6 present.
Handle 0x0014, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 8 GB
Error Information Handle: Not Provided
Number Of Devices: 2
Handle 0x0016, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x0014
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM0
Bank Locator: BANK0
Type: Other
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Manufacturer00
Serial Number: SerNum00
Asset Tag: Not Specified
Part Number: ModulePartNumber00
Rank: Unknown
Handle 0x0018, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x0014
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM1
Bank Locator: BANK1
Type: Other
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Manufacturer01
Serial Number: SerNum01
Asset Tag: Not Specified
Part Number: ModulePartNumber01
Rank: Unknown
但还有这样的：
# free
total used free shared buff/cache available
Mem: 7881812 236436 237512 8736 7407864 7233756
删除并读取内存后，CentOS 现在再次使用 16Gb：
total used free shared buff/cache available
Mem: 16139344 293560 15629068 8708 216716 15548680
dmidecode 仍然说Maximum Capacity: 8 GB。
令我恼火的是，内存条总是被识别但一开始就没有被使用。
任何想法？