首先使用smartctl --all /dev/sda指令來檢查硬盤信息，該指令CentOS自帶，得到的結果可能如下：

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

這里的Device Model右側的信息就是硬盤的具體型號，User Capacity右側的信息就是硬盤的實際大小，同時也表明該機器并沒有做磁盤陣列。 如果該機有做磁盤陣列，那么運行上述命令得到的結果可能如下：

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

這里的Vendor和Product實際上是磁盤陣列卡的信息，而不是磁盤信息。

這時可先安裝smart工具，指令為yum install smartmontools,輸入該指令并回車。之后輸入指令： smartctl -a -d sat+megaraid,0 /dev/sda并回車，可得到如下的結果：

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

這里的Device Model右側的信息就是硬盤的具體型號，User Capacity右側的信息就是硬盤的實際大小。

總結

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