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SSD写入量达到设计极限，颗粒擦写寿命耗尽后会导致磁盘写入速度非常缓慢，读取正常。

使用smartctl及raid卡管理软件查看硬盘smart信息可以发现Media_Wearout_Indicator值降为1，表明寿命完全耗尽。

涉及范围
所有SSD处理方案
查看SSD smart信息方法：1、使用storcli64查看阵列卡下挂载的设备序号
./storcli64 -pdlist -a0 |grep Id |awk '{print $3}'Device Id: 17
Device Id: 18
......2、根据磁盘Media_Wearout_Indicator值判断是否寿命耗尽
smartctl -a --device=sat+megaraid,17 /dev/sda | grep 'Media_Wearout_Indicator'
smartctl -a --device=sat+megaraid,18 /dev/sdb | grep 'Media_Wearout_Indicator'其中sda,sdb为硬盘所属raid在OS下的盘符3、 固态硬盘的保修期除了会受到使用年限的影响之外，还可能会受到能够写入硬盘的最大数据量的影响，最大数据量由硬盘的具体生产厂家以及具体型号决定。如果经浪潮公司鉴定，硬盘的写入数据量已达到或超过最大限制，浪潮公司将不会按照保修政策予以维修和更换”故障根因
SSD闪存颗粒寿命耗尽********************************************
smart完整输出SMART Attributes Data Structure revision number: 1Vendor Specific SMART Attributes with Thresholds:ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE5 Reallocated_Sector_Ct   0x0032   100   100   000    Old_age   Always       -       09 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       973812 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       8170 Unknown_Attribute       0x0033   100   100   010    Pre-fail  Always       -       0171 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0172 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0174 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       6175 Program_Fail_Count_Chip 0x0033   100   100   010    Pre-fail  Always       -       283468968878183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0184 End-to-End_Error        0x0033   100   100   090    Pre-fail  Always       -       0187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0190 Airflow_Temperature_Cel 0x0022   075   075   000    Old_age   Always       -       25 (Min/Max 18/25)192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       6194 Temperature_Celsius     0x0022   100   100   000    Old_age   Always       -       25197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       0199 UDMA_CRC_Error_Count    0x003e   100   100   000    Old_age   Always       -       0225 Unknown_SSD_Attribute   0x0032   100   100   000    Old_age   Always       -       68389846226 Unknown_SSD_Attribute   0x0032   100   100   000    Old_age   Always       -       55828227 Unknown_SSD_Attribute   0x0032   100   100   000    Old_age   Always       -       0228 Power-off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       584249232 Available_Reservd_Space 0x0033   100   100   010    Pre-fail  Always       -       0233 Media_Wearout_Indicator 0x0032   046   046   000    Old_age   Always       -       0234 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0241 Total_LBAs_Written      0x0032   100   100   000    Old_age   Always       -       68389846242 Total_LBAs_Read         0x0032   100   100   000    Old_age   Always       -       1011243 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       78504917intel SSD

232 Available_Reservd_Space 0x0033   100   100   010    Pre-fail  Always       -       0233 Media_Wearout_Indicator 0x0032   046   046   000    Old_age   Always       -       0

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CentOS下查看 ssd 寿命安装必要的软件yum install -y MegaCli Lib_Utils得到 device id/opt/MegaRAID/MegaCli/MegaCli64 -LdPdInfo -aALL | grep -B 30 'Solid State Device' | grep 'Device Id' 我这里得到的是 1， 下面用 smartctl 的时候跟上 ,1smartctl -a -d sat+megaraid,1 /dev/sdc | grep Media_Wearout_IndicatorWear Levelling Count(颗粒平均擦写次数):最后一列为 0，即这块硬盘的全盘写入/擦除（P/E）数为 0 次,显示还有 100% 的寿命.ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0