查看内存，cpu的一些命令
1.查看主板型号：
dmidecode |grep -A16 "System Information$" -A16 输出关键字和其下面的16行
2.内存槽及内存条：
dmidecode |grep -A16 "Memory Device$"
3.查看内存槽数、那个槽位插了内存，大小是多少
dmidecode|grep -P -A5 "Memory\s+Device"|grep Size|grep -v Range
4.查看最大支持内存数
dmidecode|grep -P 'Maximum\s+Capacity'
5.查看槽位上内存的速率，没插就是unknown。
#dmidecode|grep -A16 "Memory Device"|grep 'Speed'
4.Speed: 1333 MHz
5.Speed: 1333 MHz
6.Speed: Unknown
7.Speed: Unknown
8.Speed: Unknown
9.Speed: Unknown
10.Speed: Unknown
11.Speed: Unknown
12.Speed: Unknown
13.Speed: 1333 MHz
14.Speed: 1333 MHz
15.Speed: Unknown
16.Speed: Unknown
17.Speed: Unknown
18.Speed: Unknown
19.Speed: Unknown
20.Speed: Unknown
21.Speed: Unknown
6.dmidecode -q-q(--quite) 只显示必要的信息，这个很管用
显示指定类型的信息：
通常我只想查看某类型，比如CPU，内存或者磁盘的信息而不是全部的。这可以使用-t(--type TYPE)来指定信息类型：
# dmidecode -t bios
# dmidecode -t bios, processor (这种方式好像不可以用，必须用下面的数字的方式)
# dmidecode -t 0,4 (显示bios和processor)
8. dmidecode到底支持哪些type?
这些可以在man dmidecode里面看到：
文本参数支持：
bios, system, baseboard, chassis, processor, memory, cache, connector, slot
比如只想查看序列号，可以使用:
# dmidecode -s system-serial-number
-s (--string keyword)支持的keyword包括：
-------------------------------------------------------------------------------------
bios-vendor,bios-version, bios-release-date,
system-manufacturer, system-product-name, system-version, system-serial-number,
baseboard-manu-facturer,baseboard-product-name, baseboard-version, baseboard-serial-number, baseboard-asset-tag,
chassis-manufacturer, chas-sis-version, chassis-serial-number, chassis-asset-tag,
processor-manufacturer, processor-version.
-------------------------------------------------------------------------------------
9.服务器到底能扩展到多大的内存？
dmidecode -t 16
# dmidecode 2.11
SMBIOS 2.6 present.
Handle 0x1000, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 288 GB <---288 GB
Error Information Handle: Not Provided
Number Of Devices: 18
10.网卡型号
lspci | grep Ethernet
01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
11.网卡驱动driver
gluster1 ~ # ethtool -i eno1
driver: bnx2
version: 2.2.3
firmware-version: 6.0.1 bc 5.2.3 NCSI 2.0.10
bus-info: 0000:01:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
12.编译内核时候要注意的驱动
# lspci -k |grep Ker|uniq
Kernel driver in use: pcieport
Kernel driver in use: uhci_hcd
Kernel driver in use: ehci-pci
Kernel driver in use: uhci_hcd
Kernel driver in use: ehci-pci
Kernel driver in use: ata_piix
Kernel driver in use: bnx2
Kernel driver in use: megaraid_sas
13.查看机器型号：
redhat ~ # dmidecode | grep "Product Name"
Product Name: PowerEdge R710
Product Name: 0XDX06
13.smartctl -i /dev/sd* 是用于查看SMART状态的。smartctl -H /dev/sd* 可用来查硬盘SMART健康情况
14.BIOS里面查看哪个内存条出问题了 事件日志 View Event Log
