首先使用smartctl --all /dev/sda 指令来检查硬盘信息，该指令CentOS自带，得到的结果可能如下：
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-358.el6.x86_64] (local build) Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net === START OF INFORMATION SECTION === Device Model: WDC WD20EZRX-00DC0B0 Serial Number: WD-WMC301111333 LU WWN Device Id: 5 0014ee 601111622 Firmware Version: 80.00A80 User Capacity: 2,000,398,934,016 bytes [2.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Device is: Not in smartctl database [for details use: -P showall] ATA Version is: 8 ATA Standard is: ACS-2 (revision not indicated) Local Time is: Fri Jul 3 16:04:20 2015 CST SMART support is: Available - device has SMART capability. SMART support is: Enabled
这里的Device Model右侧的信息就是硬盘的具体型号，User Capacity右侧的信息就是硬盘的实际大小，同时也表明该机器并没有做磁盘阵列。 如果该机有做磁盘阵列，那么运行上述命令得到的结果可能如下：
Vendor: DELL Product: PERC H310 Revision: 2.12 User Capacity: 999,653,638,144 bytes [999 GB] Logical block size: 512 bytes Logical Unit id: 0x6b083fe0e9aa11111cf094800440aee5 Serial number: 00e5ae40048094f01c1111aae9e03f08 Device type: disk Local Time is: Fri Jul 3 15:39:02 2015 CST Device does not support SMART Error Counter logging not supported Device does not support Self Test logging
这里的Vendor和Product实际上是磁盘阵列卡的信息，而不是磁盘信息。
这时可先安装smart工具，指令为yum install smartmontools,输入该指令并回车。之后输入指令： smartctl -a -d sat+megaraid,0 /dev/sda并回车，可得到如下的结果：
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-431.el6.x86_64] (local build) Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net === START OF INFORMATION SECTION === Device Model: ST91000640NS Serial Number: 9XG3XXXF LU WWN Device Id: 5 000x50 04fxxxx06 Firmware Version: AA02 User Capacity: 1,000,204,886,016 bytes [1.00 TB] 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 4 Local Time is: Fri Jul 3 16:01:03 2015 CST SMART support is: Available - device has SMART capability. SMART support is: Enabled
这里的Device Model右侧的信息就是硬盘的具体型号，User Capacity右侧的信息就是硬盘的实际大小。
