【求助】linux系統(tǒng)只識別出一半的物理內存

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
難道真的是xen內核問題？
樓主在哪里下載的Linux　安裝鏡像？

還有硬件問題，即使bios能識別，不代表操作系統(tǒng)能識別

上次就是因為客戶插錯內存通道，導致64位版本的Windows2008R2 只能識別4g內存，但是服務器插入的是8g內存
在Windows屬性里面也可以看到 安裝內存和可用內存，反正操作系統(tǒng)和硬件都要排查一下

niao5929

硬件本身支持嗎？？

niao5929

可以使用DMIDECODE命令查看下服務器到底是如何支持的

niao5929

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


   

phanx

回復 9# moguikuaiche


    你看嘛，你這個就是xen的內核。我上面都說了，xen內核在dom0里面只能看到32G內存。
換成標準內核唄。

把 /etc/grub/grub.conf里面的

default=0

改成 default=1 重啟，就會使用標準內核了。

moguikuaiche

回復 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

回復 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

回復 16# moguikuaiche


   一般來說，如果是內存配置錯誤，或者內存硬件問題，如果能啟動，一般在啟動的時候都會有提示。
  如果你啟動的時候沒有看到這些提示，那一般就不是這個問題。

moguikuaiche

回復 18# phanx


    沒有不聽，因為是生產環(huán)境，我需要晚上才能進行重啟等操作。上面那個命令我以前也不知道，順便學習了。
    十分感謝你的幫助！
   

phanx

回復 19# moguikuaiche


    好吧，生產環(huán)境，操作小心。 從你的信息上已經很清楚了。 但是你要明白從xen內核變?yōu)槠胀▋群艘馕吨�什么�?
只要你沒有用xen的虛擬機就應該問題不大。