Linux磁盘检测工具smartctl的使用和分析

2260xE2Load 'In'-timeTotal time of loading on the magnetic heads actuator (time not spent in parking area).

2270xE3Torque Amplification CountCount of attempts to compensate for platter speed variations

2280xE4Power-Off Retract CycleThe count of times the magnetic armature was retracted automatically as a result of cutting power.

2300xE6GMR Head AmplitudeAmplitude of thrashing (distance of repetitive forward/reverse head motion)

2310xE7TemperatureDrive Temperature

2320xE8Endurance RemainingNumber of physical erase cycles completed on the drive as a percentage of the maximum physical erase cycles the drive is designed to endure

2320xE8Available Reserved SpaceIntel SSD reports the number of available reserved space as a percentage of reserved space in a brand new SSD.

2330xE9Power-On HoursNumber of hours elapsed in the power-on state.

2330xE9Media Wearout IndicatorIntel SSD reports a normalized value of 100 (when the SSD is new) and declines to a minimum value of 1. It decreases while the NAND erase cycles increase from 0 to the maximum-rated cycles.

2400xF0Head Flying HoursTime while head is positioning

2400xF0Transfer Error Rate(Fujitsu)Count of times the link is reset during a data transfer.

2410xF1Total LBAs WrittenTotal count of LBAs written

2420xF2Total LBAs ReadTotal count of LBAs read.

Some S.M.A.R.T. utilities will report a negative number for the raw value since in reality it has 48 bits rather than 32.

2500xFARead Error Retry RateCount of errors while reading from a disk

2540xFEFree Fall Protectionount of Free Fall Events detected

3.5 SMART self-test

使用smartctl –t offline/short/long 可以指定磁盘进行自测。

offline：

这个是默认的自测。

short：

短时自测的目的是快速确认磁盘是否故障。

测试过程有很多项目，都是磁盘厂商自定义的，比如下面的项目：

a) 电气测试项目，测试磁盘内部的电路。具体测试细节有磁盘厂商自己指定，比如：

A) 缓存测试。

B) 读、写电路测试。

C) 读、写磁头测试。

b) 寻道、伺服测试项目，测试磁盘在数据磁道上的寻找和伺服能。

c) 读、校验测试项目，测试磁盘对部分或全盘的读能力。

long：

称为扩展的自测试。测试的项目和short类型，但是时间长得多。