MegaCli 是LSI公司官方提供的SCSI卡管理工具，由于LSI被收购变成了现在的Broadcom，所以现在想下载MegaCli，需要去Broadcom官网查找Legacy产品支持，搜索MegaRAID即可。
现在官方有storcli，整合了LSI和3ware所有产品。但是个人认为Megacli用起来更顺手，而且线上用了几家国产厂商服务器，用Megacli都能管理好RAID，所以换不换无所谓。
查看Adapter 信息：
./MegaCli64 -AdpAllInfo -aALL
返回结果太长很多都看不懂但没关系，新手先记住第一行，表示我的机器上有个0号适配器。MegaCli64很多命令都要在最后用-a指定Adapter，我只有Adapter #0 所以今后都写-a0就行，还可以-a0,1,2或-aALL
Adapter #0 ============================================================================== Versions ================ Product Name : PERC H710 Adapter Serial No : 31P003R FW Package Build: 21.1.0-0007 Mfg. Data ================ Mfg. Date : 01/26/13 Rework Date : 01/26/13 Revision No : A00 Battery FRU : N/A ...
查看Adapter的具体配置，这台机器插了12块盘，一块做RAID0装系统，剩下的盘做了RAID5：
./MegaCli64 -CfgDsply -aALL ============================================================================== Adapter: 0 Product Name: PERC H710 Adapter Memory: 512MB BBU: Present Serial No: 31P003R ============================================================================== Number of DISK GROUPS: 2 #有俩磁盘组 DISK GROUPS: 0 #0号磁盘组 Number of Spans: 1 SPAN: 0 Span Reference: 0x00 Number of PDs: 1 Number of VDs: 1 Number of dedicated Hotspares: 0 Virtual Disk Information: Virtual Disk: 0 (Target Id: 0) Name: RAID Level: Primary-0, Secondary-0, RAID Level Qualifier-0 #做了RAID0 Size:2.728 TB State: Optimal Stripe Size: 64 KB Number Of Drives:1 Span Depth:1 Default Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU Access Policy: Read/Write Disk Cache Policy: Disk‘s Default Encryption Type: None Physical Disk Information: Physical Disk: 0 Enclosure Device ID: 32 Slot Number: 0 Device Id: 0 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: 2.728 TB [0x15d50a3b0 Sectors] Non Coerced Size: 2.728 TB [0x15d40a3b0 Sectors] Coerced Size: 2.728 TB [0x15d400000 Sectors] Firmware state: Online SAS Address(0): 0x500056b37789abee Connected Port Number: 0(path0) Inquiry Data: 手动马赛克 #这里是序列号 FDE Capable: Not Capable FDE Enable: Disable Secured: Unsecured Locked: Unlocked Foreign State: None Device Speed: 3.0Gb/s Link Speed: 3.0Gb/s Media Type: Hard Disk Device DISK GROUPS: 1 #1号磁盘组 Number of Spans: 1 SPAN: 0 Span Reference: 0x01 Number of PDs: 11 #11块物理盘 Number of VDs: 1 #做成了1块虚拟盘 Number of dedicated Hotspares: 0 Virtual Disk Information: Virtual Disk: 0 (Target Id: 1) Name: RAID Level: Primary-5, Secondary-0, RAID Level Qualifier-3 #做了RAID5 Size:27.285 TB State: Optimal Stripe Size: 64 KB Number Of Drives:11 Span Depth:1 Default Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU Access Policy: Read/Write Disk Cache Policy: Disk‘s Default Encryption Type: None Physical Disk Information: Physical Disk: 0 #第一块物理盘 Enclosure Device ID: 32 Slot Number: 1 Device Id: 1 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: 2.728 TB [0x15d50a3b0 Sectors] Non Coerced Size: 2.728 TB [0x15d40a3b0 Sectors] Coerced Size: 2.728 TB [0x15d400000 Sectors] Firmware state: Online SAS Address(0): 0x500056b37789abec Connected Port Number: 0(path0) Inquiry Data: 手动马赛克 #这里是磁盘的序列号，跟磁盘标签一致 FDE Capable: Not Capable FDE Enable: Disable Secured: Unsecured Locked: Unlocked Foreign State: None Device Speed: 3.0Gb/s Link Speed: 3.0Gb/s Media Type: Hard Disk Device ...
查看每块物理盘的信息和状态，跟前面一样，只是少了Adapter信息。
./MegaCli64 -PDList -a0 Adapter #0 Enclosure Device ID: 32 Slot Number: 0 Device Id: 0 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: 2.728 TB [0x15d50a3b0 Sectors] Non Coerced Size: 2.728 TB [0x15d40a3b0 Sectors] Coerced Size: 2.728 TB [0x15d400000 Sectors] Firmware state: Online SAS Address(0): 0x500056b37789abee Connected Port Number: 0(path0) Inquiry Data: 手动马赛克 #这里是磁盘的序列号，跟磁盘标签一致 FDE Capable: Not Capable FDE Enable: Disable Secured: Unsecured Locked: Unlocked Foreign State: None Device Speed: 3.0Gb/s Link Speed: 3.0Gb/s Media Type: Hard Disk Device Enclosure Device ID: 32 Slot Number: 1 Device Id: 1 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: 2.728 TB [0x15d50a3b0 Sectors] Non Coerced Size: 2.728 TB [0x15d40a3b0 Sectors] Coerced Size: 2.728 TB [0x15d400000 Sectors] Firmware state: Online SAS Address(0): 0x500056b37789abec Connected Port Number: 0(path0) Inquiry Data: 手动马赛克 #这里是磁盘的序列号，跟磁盘标签一致 FDE Capable: Not Capable FDE Enable: Disable Secured: Unsecured Locked: Unlocked Foreign State: None Device Speed: 3.0Gb/s Link Speed: 3.0Gb/s Media Type: Hard Disk Device ...
这里会拿到很多有用的信息：
1、Slot Number：slot号，应该跟机器外观上的标识一致。如果机器上有多块盘，直接告诉现场工程师slot X的硬盘有问题，工程师就会直接换盘。
2、Inquiry Data: 这里是磁盘的序列号，跟磁盘标签上一致。磁盘标签需要拔盘才能看到，按slot拔盘看到磁盘的序列号应该跟Inquiry Data一致。
3、Firmware state: 这里能看到磁盘的状态，Online是我们期望看到的最好状态，除此之外还有 Unconfigured Offline Failed等等，大多表达一个悲伤的事实：你要加班报修/修复他们了。。。
4、需要特别关注这几个指标：Media Error / Other Error / Predictive Failure Count / Last Predictive Failure Event Seq Number 都有可能不是0。这意味着磁盘虽然能用但已经不再可靠，很有可能存在坏簇、坏道之类的问题，必须尽快换掉这块盘。如果坚持使用，那磁盘就离彻底坏掉不远了。网上流传的说法是前3个Count越大代表磁盘状态越差，实际未必是这样，以下2个截图就可以说明。
本文出自 “世界坑同事大赛冠军” 博客，转载请与作者联系！
原文地址：http://ces4751.blog.51cto.com/849902/1967243
