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。
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