【求助】linux系统只识别出一半的物理内存

lyhabc

uname -a
Linux rh54 2.6.18-348.el5xen #1 SMP Wed Nov 28 21:31:28 EST 2012 x86_64 x86_64 x86_64 GNU/Linux



title Red Hat Enterprise Linux Server (2.6.18-348.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-348.el5
难道真的是xen内核问题？
楼主在哪里下载的Linux　安装镜像？

还有硬件问题，即使bios能识别，不代表操作系统能识别

上次就是因为客户插错内存通道，导致64位版本的Windows2008R2 只能识别4g内存，但是服务器插入的是8g内存
在Windows属性里面也可以看到 安装内存和可用内存，反正操作系统和硬件都要排查一下

niao5929

硬件本身支持吗？？

niao5929

可以使用DMIDECODE命令查看下服务器到底是如何支持的

niao5929

命令：
dmidecode -t 16
dmidecode -t 17回复 13# niao5929


   

phanx

回复 9# moguikuaiche


    你看嘛，你这个就是xen的内核。我上面都说了，xen内核在dom0里面只能看到32G内存。
换成标准内核呗。

把 /etc/grub/grub.conf里面的

default=0

改成 default=1 重启，就会使用标准内核了。

moguikuaiche

回复 14# niao5929


    [root@rh5 ~]# dmidecode -t 16
# dmidecode 2.11
SMBIOS 2.7 present.

Handle 0x002D, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: Multi-bit ECC
        Maximum Capacity: 96 GB
        Error Information Handle: Not Provided
        Number Of Devices: 6

Handle 0x003B, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: Multi-bit ECC
        Maximum Capacity: 96 GB
        Error Information Handle: Not Provided
        Number Of Devices: 6

moguikuaiche

回复 14# niao5929


    [root@rh5 ~# dmidecode -t 17
# dmidecode 2.11
SMBIOS 2.7 present.

Handle 0x002F, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002D
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: Cpu1_DimmA1
        Bank Locator: Cpu1_Bank0
        Type: DDR3
        Type Detail: Registered (Buffered)
        Speed: 1333 MHz
        Manufacturer: Micron            
        Serial Number: 0D0BD471     
        Asset Tag: DimmA1_AssetTag
        Part Number: 36KSF2G72PZ-1G6E
        Rank: 2
        Configured Clock Speed: 1333 MHz

Handle 0x0031, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002D
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu1_DimmA2
        Bank Locator: Cpu1_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmA2_Manufacturer
        Serial Number: DimmA2_SerNum
        Asset Tag: DimmA2_AssetTag
        Part Number: DimmA2_PartNumA2
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x0033, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002D
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: Cpu1_DimmB1
        Bank Locator: Cpu1_Bank0
        Type: DDR3
        Type Detail: Registered (Buffered)
        Speed: 1333 MHz
        Manufacturer: Micron            
        Serial Number: 0D0BD472     
        Asset Tag: DimmB1_AssetTag
        Part Number: 36KSF2G72PZ-1G6E
        Rank: 2
        Configured Clock Speed: 1333 MHz

Handle 0x0035, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002D
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu1_DimmB2
        Bank Locator: Cpu1_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmB2_Manufacturer
        Serial Number: DimmB2_SerNum
        Asset Tag: DimmB2_AssetTag
        Part Number: DimmB2_PartNumB2
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x0037, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002D
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu1_DimmC1
        Bank Locator: Cpu1_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmC1_Manufacturer
        Serial Number: DimmC1_SerNum
        Asset Tag: DimmC1_AssetTag
        Part Number: DimmC1_PartNumC1
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x0039, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002D
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu1_DimmC2
        Bank Locator: Cpu1_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmC2_Manufacturer
        Serial Number: DimmC2_SerNum
        Asset Tag: DimmC2_AssetTag
        Part Number: DimmC2_PartNumC2
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x003D, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: Cpu2_DimmA1
        Bank Locator: Cpu2_Bank0
        Type: DDR3
        Type Detail: Registered (Buffered)
        Speed: 1333 MHz
        Manufacturer: Micron            
        Serial Number: 0D0BD463     
        Asset Tag: DimmA1_AssetTag
        Part Number: 36KSF2G72PZ-1G6E
        Rank: 2
        Configured Clock Speed: 1333 MHz

Handle 0x003F, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu2_DimmA2
        Bank Locator: Cpu2_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmA2_Manufacturer
        Serial Number: DimmA2_SerNum
        Asset Tag: DimmA2_AssetTag
        Part Number: DimmA2_PartNumA2
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x0041, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: Cpu2_DimmB1
        Bank Locator: Cpu2_Bank0
        Type: DDR3
        Type Detail: Registered (Buffered)
        Speed: 1333 MHz
        Manufacturer: Micron            
        Serial Number: 0D0BD4A9     
        Asset Tag: DimmB1_AssetTag
        Part Number: 36KSF2G72PZ-1G6E
        Rank: 2
        Configured Clock Speed: 1333 MHz

Handle 0x0043, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu2_DimmB2
        Bank Locator: Cpu2_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmB2_Manufacturer
        Serial Number: DimmB2_SerNum
        Asset Tag: DimmB2_AssetTag
        Part Number: DimmB2_PartNumB2
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x0045, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu2_DimmC1
        Bank Locator: Cpu2_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmC1_Manufacturer
        Serial Number: DimmC1_SerNum
        Asset Tag: DimmC1_AssetTag
        Part Number: DimmC1_PartNumC1
        Rank: Unknown
        Configured Clock Speed: Unknown

Handle 0x0047, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: Cpu2_DimmC2
        Bank Locator: Cpu2_Bank0
        Type: Unknown
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: DimmC2_Manufacturer
        Serial Number: DimmC2_SerNum
        Asset Tag: DimmC2_AssetTag
        Part Number: DimmC2_PartNumC2
        Rank: Unknown
        Configured Clock Speed: Unknown

phanx

回复 16# moguikuaiche


   一般来说，如果是内存配置错误，或者内存硬件问题，如果能启动，一般在启动的时候都会有提示。
  如果你启动的时候没有看到这些提示，那一般就不是这个问题。

moguikuaiche

回复 18# phanx


    没有不听，因为是生产环境，我需要晚上才能进行重启等操作。上面那个命令我以前也不知道，顺便学习了。
    十分感谢你的帮助！
   

phanx

回复 19# moguikuaiche


    好吧，生产环境，操作小心。 从你的信息上已经很清楚了。 但是你要明白从xen内核变为普通内核意味着什么。
只要你没有用xen的虚拟机就应该问题不大。