一、檢視Raid卡資訊
megacli -LDInfo -Lall -aALL

[[email protected] robin]# megacli -LDInfo -Lall -aALL

OSSpecificInitialize: Failed to load libsysfs.so.2.0.2 Please ensure that libsfs is present in the system.
The dependent library libsysfs.so.2.0.1 not available. Please contact LSI for distribution of the package

Adapter 0 – Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name :
RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0
Size : 930.5 GB
Mirror Data : 930.5 GB
State : Optimal <<<< 這是正常的狀態。Degraded 代表raid組有硬碟故障，raid組降級。

Strip Size : 64 KB
Number Of Drives per span:2 <<<< RAID組包含2塊磁碟（但實際是4塊500G的SSD做Raid10）。

Span Depth : 2 <<<< 深度若是1，說明實際只是RAID 1。2表示可以是RAID 10

Default Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy : Disk’s Default
Ongoing Progresses:
Background Initialization: Completed 41%, Taken 190 min.
Encryption Type : None
Default Power Savings Policy: Controller Defined
Current Power Savings Policy: None
Can spin up in 1 minute: No
LD has drives that support T10 power conditions: No
LD’s IO profile supports MAX power savings with cached writes: No
Bad Blocks Exist: No
Is VD Cached: No

備註：

RAID型號對應表資訊如下：

RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0" #代表Raid 1

RAID Level : Primary-0, Secondary-0, RAID Level Qualifier-0" #代表Raid 0

RAID Level : Primary-5, Secondary-0, RAID Level Qualifier-3" #代表Raid 5

RAID Level : Primary-1, Secondary-3, RAID Level Qualifier-0" #代表Raid10

二、檢視硬碟資訊：
[[email protected] robin]# megacli -PDList -aALL

有如下樣式的幾段，說明實際有幾塊硬碟（下面是一塊500G的SSD的資訊）

Enclosure Device ID: 32
Slot Number: 3
Drive’s postion: DiskGroup: 0, Span: 1, Arm: 1
Enclosure position: 0
Device Id: 3
WWN: 50025388A0061518
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SATA
Raw Size: 465.761 GB [0x3a386030 Sectors]
Non Coerced Size: 465.261 GB [0x3a286030 Sectors]
Coerced Size: 465.25 GB [0x3a280000 Sectors]
Firmware state: Online, Spun Up <<< Online 代表磁碟正常；若為 Failed 代表硬碟故障。
Device Firmware Level: BB0Q
Shield Counter: 0
Successful diagnostics completion on : N/A
SAS Address(0): 0x4433221107000000
Connected Port Number: 3(path0)
Inquiry Data: S1DHNSADA04008B Samsung SSD 840 EVO 500GB EXT0BB0Q
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: Solid State Device
Drive: Not Certified
Drive Temperature :32C (89.60 F)
PI Eligibility: No
Drive is formatted for PI information: No
PI: No PI
Drive’s write cache : Disabled
Drive’s NCQ setting : Disabled
Port-0 :
Port status: Active
Port’s Linkspeed: 6.0Gb/s
Drive has flagged a S.M.A.R.T alert : No

關於這個工具的更多的使用方法，請移步：

raid卡的資料在硬碟上有一份，在raid卡中有一份，當邏輯有錯誤的時候，可以重新從硬碟把邏輯資料匯入，這個時候會做一些檢驗和檢查

raid卡的盤有4種基本狀態。

Failed 基本無救，聯絡dell保修。

Online 正常裝填。

Foreign 邏輯有錯誤，這個盤未識別，解決方法：從硬碟重新匯入raid卡的邏輯資料。

Unconfigd 第一種情況就是這個盤沒有配置在raid中，第二種情況就是邏輯有錯誤，這個盤未識別。解決方法：從硬碟重新匯入raid卡的邏輯資料。第一種情況下，重新從硬碟匯入邏輯資料也沒辦法，第二種情況下是可以的。

spans值 1,2,3,4做raid0，八塊盤做raid1形成1、2、3、4

Drive’s position: DiskGroup: 0, Span: 0, Arm: 1

如果盤壞在不同的raid1上，就可以，如果壞在相同的raid1上資料就完了，所以最大可以壞4塊盤。

PD值 0、1、2、3、4、5、6、7、

mt檢測：

dmidecode |grep -i ser

MegaCli -pdlist -aall

MegaCli -pdlist -aall |grep ‘Firmware state’

MegaCli -LDInfo -Lall -aALL

MegaCli -h

MegaCli -CfgForeign -Import -aall

MegaCli -pdlist -aall |grep ‘Firmware state’

MegaCli -pdlist -aall

MegaCli -LdPdInfo -aALL

MegaCli -LdPdInfo -aALL|more

MegaCli -LdPdInfo -aALL >

vim aaaa

MegaCli -pdlist -aall

MegaCli -pdlist -aall |grep ‘Firmware state’

MegaCli -FwTermLog -Dsply -aALL