[archlinux][hardware] 查看SSD的使用寿命

因为最近把16GB的SSD做成了HDD的cache，所以比较关系寿命问题。

使用smartctl工具。

参考：https://www.v2ex.com/t/261373

linux 下面只有 smartmontools 这一个工具，而且只对像三丧和 intel 这样的大厂支持良好，其余的厂家文档不全或故意不公开接口，第三方工具就没办法了。

其中最后一个最重要和直观 “ Percentage Used Endurance Indicator ” ，单位是百分比，新的是 0%

我现在的寿命是1%，持续观察一阵。

/home/tong/bin [tong@T7] [16:53]
> sudo smartctl -l devstat /dev/sdb
smartctl 6.5 2016-05-07 r4318 [x86_64-linux-4.8.11-1-ARCH] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

Device Statistics (GP Log 0x04)
Page  Offset Size        Value Flags Description
0x05  =====  =               =  ===  == Temperature Statistics (rev 1) ==
0x05  0x008  1              44  ---  Current Temperature
0x05  0x010  1               -  ---  Average Short Term Temperature
0x05  0x018  1               -  ---  Average Long Term Temperature
0x05  0x020  1              54  ---  Highest Temperature
0x05  0x028  1              25  ---  Lowest Temperature
0x05  0x030  1              46  ---  Highest Average Short Term Temperature
0x05  0x038  1              46  ---  Lowest Average Short Term Temperature
0x05  0x040  1               -  ---  Highest Average Long Term Temperature
0x05  0x048  1               -  ---  Lowest Average Long Term Temperature
0x05  0x050  4               0  ---  Time in Over-Temperature
0x05  0x058  1              95  ---  Specified Maximum Operating Temperature
0x05  0x060  4               0  ---  Time in Under-Temperature
0x05  0x068  1               0  ---  Specified Minimum Operating Temperature
0x07  =====  =               =  ===  == Solid State Device Statistics (rev 1) ==
0x07  0x008  1               1  N--  Percentage Used Endurance Indicator
                                |||_ C monitored condition met
                                ||__ D supports DSN
                                |___ N normalized value


/home/tong/bin [tong@T7] [16:54]
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