昨天跑了一下 btrfs scrub 今天看到以下信息：

Mar 25 23:38:46 nas smartd[1018]: Device: /dev/sda [SAT], SMART Prefailure Attribute: 1 Raw_Read_Error_Rate changed from 100 to 72
Mar 25 23:38:46 nas smartd[1018]: Device: /dev/sda [SAT], Failed SMART usage Attribute: 190 Airflow_Temperature_Cel.
Mar 25 23:38:46 nas smartd[1018]: Device: /dev/sda [SAT], SMART Usage Attribute: 190 Airflow_Temperature_Cel changed from 38 to 39
Mar 25 23:38:46 nas smartd[1018]: Device: /dev/sda [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 62 to 61
Mar 25 23:38:46 nas smartd[1018]: Device: /dev/sda [SAT], SMART Usage Attribute: 195 Hardware_ECC_Recovered changed from 100 to 74

其中的  Raw_Read_Error_Rate 和 Hardware_ECC_Recovered 都发生了变化，是否代表这个盘的健康程序已经下降了？
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FROM 47.243.39.*