背景：IDC异地搬迁，存储用货车拉到新机房上架，很多磁盘本身就坏了或在路上被颠坏，找台换完盘没修复完的机器玩玩~
注意，以下操作尽量在没有IO操作的情况下进行。
1、查看所有磁盘的状态，这没啥好说的
./MegaCli64 -PDList -a0
2、有块盘Firmware state是Unconfigured(bad)，这是今天要拯救的目标
Enclosure Device ID: 0
Slot Number: 9
Device Id: 8
Sequence Number: 7
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SATA
Raw Size: 3.638 TB [0x1d1c0beb0 Sectors]
Non Coerced Size: 3.637 TB [0x1d1b0beb0 Sectors]
Coerced Size: 3.637 TB [0x1d1b00000 Sectors]
Firmware state: Unconfigured(bad)
SAS Address(0): 0x5001c4500077d8a9
Connected Port Number: 0(path0)
Inquiry Data: 手动马赛克
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Foreign State: None
Device Speed: Unknown
Link Speed: Unknown
Media Type: Hard Disk Device
3、先让这块磁盘变成good
./MegaCli64 -PDMakeGood -PhysDrv[0:9] -a0
这里-PhysDrv[0:9]对应上面的Enclosure Device ID和Slot Number，-a肯定是Adapter #0，再看磁盘的状态
Enclosure Device ID: 0
Slot Number: 9
Device Id: 8
Sequence Number: 8
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
PD Type: SATA
Raw Size: 3.638 TB [0x1d1c0beb0 Sectors]
Non Coerced Size: 3.637 TB [0x1d1b0beb0 Sectors]
Coerced Size: 3.637 TB [0x1d1b00000 Sectors]
Firmware state: Unconfigured(good), Spun Up
SAS Address(0): 0x5001c4500077d8a9
Connected Port Number: 0(path0)
Inquiry Data: 手动马赛克
FDE Capable: Not Capable
FDE Enable: Disable
Secured: Unsecured
Locked: Unlocked
Foreign State: Foreign
Foreign Secure: Drive is not secured by a foreign lock key
Device Speed: Unknown
Link Speed: Unknown
Media Type: Hard Disk Device
4、现在看看原来RAID阵列谁掉了，也就是说被换掉的坏盘原来在阵列里的位置
./MegaCli64 -pdgetmissing -a0
Adapter 0 - Missing Physical drives
No. Array Row Size Expected
0 1 0 3814912 MB
Exit Code: 0x00
5、记住是Array 1，Row 0，下面用新盘替换这个位置
./MegaCli64 -PdReplaceMissing -physdrv[0:9] -array1 -row0 -a0
Adapter: 0: Missing PD at Array 1, Row 0 is replaced.
Exit Code: 0x00
6、可以看到成功了，但是RAID还不能用，我们只是拿一块空盘替换原来装着数据的坏盘，要先恢复数据才行。怎么恢复？RAID5可以通过校验其他盘来恢复坏盘的数据，恢复的过程叫Rebuild。下面先把Rebuild开起来
./MegaCli64 -PDRbld -Start -PhysDrv[0:9] -a0
Started rebuild progress on device(Encl-0 Slot-9)
Exit Code: 0x00
7、rebuild已经开始了，这个过程非常耗时间，对磁盘IO带来很大压力，所以尽量不要读写数据。我也经历过Rebuild 2天之后没好，反而把其他磁盘搞坏了的倒霉事儿。所以，有这个空去拜个佛烧柱香，成功的概率可能会大一些。怎么知道Rebuild 进度呢？
./MegaCli64 -pdrbld -showprog -physdrv[0:9] -a0
Rebuild Progress on Device at Enclosure 0, Slot 9 Completed 1% in 6 Minutes.
Exit Code: 0x00
这表示：已经用了6分钟，完成了1% 。。。。照这速度大概10个小时以后能完成