查看Linux系统下Raid信息

软件raid：只能通过Linux系统本身来查看

cat /proc/mdstat

可以看到raid级别，状态等信息。

硬件raid： 最佳的办法是通过已安装的raid厂商的管理工具来查看，有cmdline，也有图形界面。如Adaptec公司的硬件卡就可以通过下面的命令进行查看：

# /usr/dpt/raidutil -L all

可以看到非常详细的信息。

当然更多情况是没有安装相应的管理工具，只能依靠Linux本身的话一般我知道的是两种方式：

# dmesg |grep -i raid

# cat /proc/scsi/scsi

显示的信息差不多，raid的厂商，型号，级别，但无法查看各块硬盘的信息。

另外经过实际测试，Dell的服务器可以通过命令来显示，而HP、IBM等的服务器通过上面的命令是显示不出的。只能够通过装硬件厂商的管理工具来查看。

linux 下查看硬盘型号、大小等信息，机器有没有做Raid有关系

一、普通模式（该机硬盘没有做磁盘阵列）

1、fdisk -l 查看你的硬盘编号，如sda,sdb 等

2、smartctl --all /dev/sda

smartctl --all /dev/sda #该命令centos自带

[root@localhost ~]# smartctl --all /dev/sda
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-504.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Device Model:     SanDisk SD6SB1M128G1022I
Serial Number:    141218410909
LU WWN Device Id: 5 001b44 becdaed9d
Firmware Version: X231600
User Capacity:    128,035,676,160 bytes [128 GB]
Sector Size:      512 bytes logical/physical
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 6
Local Time is:    Fri Jan 16 08:35:48 2015 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

从上面可以看出，硬盘型号为SanDisk SD6SB1M128G1022I，容量为128GB

二、磁盘阵列 RAID模式

如果该机有做磁盘阵列，那么运行上述命令会报错，得不到你要的磁盘信息。可以借助MegaCli命令

MegaCli命令系统不自带，需要额外下载，

下载地址：

http://www.lsi.com/downloads/Public/RAID%20Controllers/RAID%20Controllers%20Common%20Files/8.07.14_MegaCLI.zip

下载之后解压，

unzip CSA1.5-MegaCli_REL80571.zip

cd MegaCLI/MegaCli_Linux

rpm -ivh MegaCli-8.05.71-1.noarch.rpm

安装完成

ln -s /opt/MegaRAID/MegaCli/MegaCli64 /usr/bin/

默认安装在/opt下面，建立软链到/usr/bin

[root@localhost bin]# /opt/MegaRAID/MegaCli/MegaCli64 -PDlist -aALL

Adapter #0

Enclosure Device ID: 32
Slot Number: 0
Drive's position: DiskGroup: 0, Span: 0, Arm: 0
Enclosure position: 1
Device Id: 0
WWN: 50000C0F02E57BE9
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS

Raw Size: 279.396 GB [0x22ecb25c Sectors]
Non Coerced Size: 278.896 GB [0x22dcb25c Sectors]
Coerced Size: 278.875 GB [0x22dc0000 Sectors]
Sector Size:  0
Firmware state: Online, Spun Up
Device Firmware Level: D1S6
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x50000c0f02e57bea
SAS Address(1): 0x0
Connected Port Number: 0(path0)
Inquiry Data: WD      WD3001BKHG      D1S6WX11E83NU249
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None
Device Speed: 6.0Gb/s
Link Speed: 6.0Gb/s
Media Type: Hard Disk Device
Drive Temperature :31C (87.80 F)
PI Eligibility:  No
Drive is formatted for PI information:  No
PI: No PI
Port-0 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Port-1 :
Port status: Active
Port's Linkspeed: Unknown
Drive has flagged a S.M.A.R.T alert : No

Enclosure Device ID: 32
Slot Number: 1
Drive's position: DiskGroup: 0, Span: 0, Arm: 1
Enclosure position: 1
Device Id: 1
WWN: 50000C0F028F32ED
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS

Raw Size: 279.396 GB [0x22ecb25c Sectors]
Non Coerced Size: 278.896 GB [0x22dcb25c Sectors]
Coerced Size: 278.875 GB [0x22dc0000 Sectors]
Sector Size:  0
Firmware state: Online, Spun Up
Device Firmware Level: D1S6
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x50000c0f028f32ee
SAS Address(1): 0x0
Connected Port Number: 1(path0)
Inquiry Data: WD      WD3001BKHG      D1S6WX11E83VD242
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None
Device Speed: 6.0Gb/s
Link Speed: 6.0Gb/s
Media Type: Hard Disk Device
Drive Temperature :31C (87.80 F)
PI Eligibility:  No
Drive is formatted for PI information:  No
PI: No PI
Port-0 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Port-1 :
Port status: Active
Port's Linkspeed: Unknown
Drive has flagged a S.M.A.R.T alert : No

Enclosure Device ID: 32
Slot Number: 2
Drive's position: DiskGroup: 0, Span: 0, Arm: 2
Enclosure position: 1
Device Id: 2
WWN: 50000C0F02E5B8ED
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SAS

Raw Size: 279.396 GB [0x22ecb25c Sectors]
Non Coerced Size: 278.896 GB [0x22dcb25c Sectors]
Coerced Size: 278.875 GB [0x22dc0000 Sectors]
Sector Size:  0
Firmware state: Online, Spun Up
Device Firmware Level: D1S6
Shield Counter: 0
Successful diagnostics completion on :  N/A
SAS Address(0): 0x50000c0f02e5b8ee
SAS Address(1): 0x0
Connected Port Number: 2(path0)
Inquiry Data: WD      WD3001BKHG      D1S6WX11E83NU081
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Needs EKM Attention: No
Foreign State: None
Device Speed: 6.0Gb/s
Link Speed: 6.0Gb/s
Media Type: Hard Disk Device
Drive Temperature :28C (82.40 F)
PI Eligibility:  No
Drive is formatted for PI information:  No
PI: No PI
Port-0 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Port-1 :
Port status: Active
Port's Linkspeed: Unknown
Drive has flagged a S.M.A.R.T alert : No

Exit Code: 0x00

从上面可以看出，该机有三块硬盘，型号为，

WD WD3001BKHG D1S6WX11E83NU249，容量为300GB。

MegaCli常用参数介绍 
MegaCli -adpCount 【显示适配器个数】
MegaCli -AdpGetTime –aALL 【显示适配器时间】
MegaCli -AdpAllInfo -aAll 【显示所有适配器信息】
MegaCli -LDInfo -LALL -aAll 【显示所有逻辑磁盘组信息】
MegaCli -PDList -aAll 【显示所有的物理信息】
MegaCli -AdpBbuCmd -GetBbuStatus -aALL |grep ‘Charger Status’ 【查看充电状态】
MegaCli -AdpBbuCmd -GetBbuStatus -aALL【显示BBU状态信息】
MegaCli -AdpBbuCmd -GetBbuCapacityInfo -aALL【显示BBU容量信息】
MegaCli -AdpBbuCmd -GetBbuDesignInfo -aALL 【显示BBU设计参数】
MegaCli -AdpBbuCmd -GetBbuProperties -aALL 【显示当前BBU属性】
MegaCli -cfgdsply -aALL 【显示Raid卡型号，Raid设置，Disk相关信息】

磁带状态的变化，从拔盘，到插盘的过程中。 
Device |Normal|Damage|Rebuild|Normal
Virtual Drive |Optimal|Degraded|Degraded|Optimal
Physical Drive |Online|Failed –> Unconfigured|Rebuild|Online