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] [:]
> sudo smartctl -l devstat /dev/sdb
smartctl 6.5 -- r4318 [x86_64-linux-4.8.--ARCH] (local build)
Copyright (C) -, Bruce Allen, Christian Franke, www.smartmontools.org Device Statistics (GP Log 0x04)
Page Offset Size Value Flags Description
0x05 ===== = = === == Temperature Statistics (rev ) ==
0x05 0x008 --- Current Temperature
0x05 0x010 - --- Average Short Term Temperature
0x05 0x018 - --- Average Long Term Temperature
0x05 0x020 --- Highest Temperature
0x05 0x028 --- Lowest Temperature
0x05 0x030 --- Highest Average Short Term Temperature
0x05 0x038 --- Lowest Average Short Term Temperature
0x05 0x040 - --- Highest Average Long Term Temperature
0x05 0x048 - --- Lowest Average Long Term Temperature
0x05 0x050 --- Time in Over-Temperature
0x05 0x058 --- Specified Maximum Operating Temperature
0x05 0x060 --- Time in Under-Temperature
0x05 0x068 --- Specified Minimum Operating Temperature
0x07 ===== = = === == Solid State Device Statistics (rev ) ==
0x07 0x008 1 N-- Percentage Used Endurance Indicator
|||_ C monitored condition met
||__ D supports DSN
|___ N normalized value /home/tong/bin [tong@T7] [:]
>
百合同样做cache，在一年之后便坏掉了的SSD，目前值为161 。。。