  寫這篇文章的原因是在部署Oracle Exadata x4-2的過程中有部分和MegaCli64命令相關的內容，之後在安裝部署IBM X3850 X5的時候，發現它和Exadata中SUN伺服器使用的是相同的陣列卡，HP，DELL的PC伺服器等大都也使用LSI的陣列卡，該型別的陣列卡透過MegaCli工具可以在作業系統層面對磁碟陣列進行非常方便的管理。

從IBM X3850 X5來說，當RAID磁碟組中的某個磁碟的磁碟被替換掉，通常需要重啟伺服器進入WEBBIOS才能夠看到新磁碟Rebuild的進度，有了MegaCli工具能夠在不停止業務的情況下，線上的觀察新磁碟是否Rebuild完成；透過MegaCli還可以檢查RAID組的狀態，檢查磁碟的狀態，給RAID組增加、刪除磁碟等等，這篇文章非常膚淺的介紹了MegaCli工具，網上有非常詳盡的介紹可以深入研究。

1.環境介紹。

[root@hisdb02 MegaCli]# dmidecode -s system-product-name
System x3850 X5 -[71437Y5]-

伺服器是IBM x3850 X5。

[root@hisdb02 MegaCli]# lspci | grep RAID
09:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2208 [Thunderbolt] (rev 03)

[root@hisdb02 MegaCli]# dmesg | grep "RAID"
scsi0 : LSI SAS based MegaRAID driver
scsi 0:0:0:0: Direct-Access IBM ServeRAID M5016 3.27 PQ: 0 ANSI: 5
scsi 0:2:0:0: Direct-Access IBM ServeRAID M5016 3.27 PQ: 0 ANSI: 5
md: Autodetecting RAID arrays.

2.安裝MegaCli工具。

  MegaCli工具在系統光碟中沒有自帶，可以從伺服器廠家的網站上下載，也可以直接到LSI的網站上下載最新的MegaCli工具。下面是LSI網站下載MegaCli工具的地址：，當前最新版本是：8.07.14。

執行下面的步驟安裝MegaCli工具：

[root@hisdb02 Server]# cd /opt
[root@hisdb02 opt]# ls
8.07.14_MegaCLI.zip
[root@hisdb02 opt]# unzip 8.07.14_MegaCLI.zip
Archive: 8.07.14_MegaCLI.zip
inflating: 8.07.14_MegaCLI.txt
inflating: DOS/MegaCLI.exe
extracting: FreeBSD/MegaCLI.zip
extracting: FreeBSD/MegaCli64.zip
inflating: Linux/MegaCli-8.07.14-1.noarch.rpm
inflating: Solaris/MegaCli.pkg
inflating: Windows/MegaCli.exe
inflating: Windows/MegaCli64.exe
[root@hisdb02 opt]# ls
8.07.14_MegaCLI.txt 8.07.14_MegaCLI.zip DOS FreeBSD Linux Solaris Windows
[root@hisdb02 opt]# cd Linux/
[root@hisdb02 Linux]# ls
MegaCli-8.07.14-1.noarch.rpm
[root@hisdb02 Linux]# rpm -ivh MegaCli-8.07.14-1.noarch.rpm
Preparing... ########################################### [100%]
1:MegaCli ########################################### [100%]
[root@hisdb02 opt]# ls
8.07.14_MegaCLI.txt 8.07.14_MegaCLI.zip DOS FreeBSD Linux MegaRAID Solaris Windows
[root@hisdb02 opt]# cd MegaRAID/MegaCli
[root@hisdb02 MegaCli]# ls
install.log libstorelibir-2.so libstorelibir-2.so.14.07-0 MegaCli64

MegaCli64就是我們要用到的MegaCli命令，64表示是64位的工具。

3.常用命令。

1).檢視RAID級別：
[root@hisdb02 MegaCli]# ./MegaCli64 -LdInfo -lAll -a0

Adapter 0 -- Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name :
RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0 <<<< RAID級別是RAID10。
Size : 557.861 GB
Sector Size : 512
Is VD emulated : No
Mirror Data : 557.861 GB
State : Optimal <<<< 這是正常的狀態。
Strip Size : 128 KB
Number Of Drives : 2 <<<< RAID組包含2塊磁碟。
Span Depth : 1 <<<< 深度是1，說明實際只是RAID 1。
Default Cache Policy: WriteBack, ReadAhead, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteBack, ReadAhead, Direct, No Write Cache if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy : Disabled
Encryption Type : None
PI type: No PI

Is VD Cached: No

這條命令檢視的也是邏輯（虛擬）磁碟的狀態，執行./MegaCli64 -LDInfo -LAll -aAll命令可以檢視所有介面卡的虛擬磁碟資訊。

2).檢視RAID控制器個數：
[root@hisdb02 MegaCli]# ./MegaCli64 -adpCount

Controller Count: 1.

只有1個控制器。執行./MegaCli64 -AdpAllInfo -aAll命令可以檢視所有介面卡的詳細資訊。

3).檢視物理磁碟資訊：
[root@hisdb02 MegaCli]# ./MegaCli64 -Pdlist -a0

Adapter #0

第一塊盤資訊：

Enclosure Device ID: 252
Slot Number: 0
Drive's position: DiskGroup: 0, Span: 0, Arm: 0
Enclosure position: N/A
Device Id: 10
WWN: 5000C5007266557C
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: 558.911 GB [0x45dd2fb0 Sectors]
Non Coerced Size: 558.411 GB [0x45cd2fb0 Sectors]
Coerced Size: 557.861 GB [0x45bb9000 Sectors]
Sector Size: 512
Logical Sector Size: 512
Physical Sector Size: 512
Firmware state: Online, Spun Up <<<< 磁碟當前的狀態，這是正常的狀態。
Commissioned Spare : No
Emergency Spare : No
Device Firmware Level: B56M
Shield Counter: 0
Successful diagnostics completion on : N/A
SAS Address(0): 0x5000c5007266557d
SAS Address(1): 0x0
Connected Port Number: 1(path0)
Inquiry Data: IBM-ESXSST600MM0006 B56MS0M2FFKB0221B5C5
IBM FRU/CRU: 49Y2004
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: Not Certified
Drive Temperature :32C (89.60 F)
PI Eligibility: Yes
Number of bytes of user data in LBA: 512
Drive is formatted for PI information: Yes
PI: PI with type 2
Port-0 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Port-1 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Drive has flagged a S.M.A.R.T alert : No

第二塊盤資訊：

Enclosure Device ID: 252
Slot Number: 1
Drive's position: DiskGroup: 0, Span: 0, Arm: 1
Enclosure position: N/A
Device Id: 9
WWN: 5000C50072665134
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: 558.911 GB [0x45dd2fb0 Sectors]
Non Coerced Size: 558.411 GB [0x45cd2fb0 Sectors]
Coerced Size: 557.861 GB [0x45bb9000 Sectors]
Sector Size: 512
Logical Sector Size: 512
Physical Sector Size: 512
Firmware state: Online, Spun Up
Commissioned Spare : No
Emergency Spare : No
Device Firmware Level: B56M
Shield Counter: 0
Successful diagnostics completion on : N/A
SAS Address(0): 0x5000c50072665135
SAS Address(1): 0x0
Connected Port Number: 0(path0)
Inquiry Data: IBM-ESXSST600MM0006 B56MS0M2F9130221B5C5
IBM FRU/CRU: 49Y2004
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: Not Certified
Drive Temperature :32C (89.60 F)
PI Eligibility: Yes
Number of bytes of user data in LBA: 512
Drive is formatted for PI information: Yes
PI: PI with type 2
Port-0 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Port-1 :
Port status: Active
Port's Linkspeed: 6.0Gb/s
Drive has flagged a S.M.A.R.T alert : No

  ./MegaCli64 -PDList -aALL命令顯示的是所有介面卡的資訊，因為當前伺服器只有一個介面卡，所以該命令的輸出結果和./MegaCli64 -Pdlist -a0命令一致。

4).檢查物理磁碟狀態：

[root@hisdb02 MegaCli]# ./MegaCli64 -Pdlist -a0|grep "Slot\|Firmware state"
Slot Number: 0
Firmware state: Online, Spun Up
Slot Number: 1
Firmware state: Online, Spun Up

5).檢視當前RAID快取狀態：
[root@hisdb02 MegaCli]# ./MegaCli64 -ldgetprop -dskcache -lall -aall

Adapter 0-VD 0(target id: 0): Disk Write Cache : Disabled

6).各種磁碟裝置的不同狀態：
Device : Normal|Damage|Rebuild|Normal
Virtual Drive : Optimal|Degraded|Degraded|Optimal
Physical Drive : Online|Failed –> Unconfigured|Rebuild|Online

注意觀察不同型別裝置的狀態，以判斷裝置是否出現故障；另外，當裝置出現故障，在作業系統日誌應該是有記錄的。更多MegaCli64命令的用法等待你去發現。

參考文章：
  http://blog.chinaunix.net/uid-25135004-id-3139293.html
  http://blog.sina.com.cn/s/blog_506ed9e60100yc2a.html

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