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。文章来源：https://www.toymoban.com/news/detail-675704.html
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: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0032 100 100 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 9738
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 8
170 Unknown_Attribute 0x0033 100 100 010 Pre-fail Always - 0
171 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0
172 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0
174 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 6
175 Program_Fail_Count_Chip 0x0033 100 100 010 Pre-fail Always - 283468968878
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
184 End-to-End_Error 0x0033 100 100 090 Pre-fail Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
190 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 - 6
194 Temperature_Celsius 0x0022 100 100 000 Old_age Always - 25
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
199 UDMA_CRC_Error_Count 0x003e 100 100 000 Old_age Always - 0
225 Unknown_SSD_Attribute 0x0032 100 100 000 Old_age Always - 68389846
226 Unknown_SSD_Attribute 0x0032 100 100 000 Old_age Always - 55828
227 Unknown_SSD_Attribute 0x0032 100 100 000 Old_age Always - 0
228 Power-off_Retract_Count 0x0032 100 100 000 Old_age Always - 584249
232 Available_Reservd_Space 0x0033 100 100 010 Pre-fail Always - 0
233 Media_Wearout_Indicator 0x0032 046 046 000 Old_age Always - 0
234 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0
241 Total_LBAs_Written 0x0032 100 100 000 Old_age Always - 68389846
242 Total_LBAs_Read 0x0032 100 100 000 Old_age Always - 1011
243 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 78504917
intel SSD
232 Available_Reservd_Space 0x0033 100 100 010 Pre-fail Always - 0
233 Media_Wearout_Indicator 0x0032 046 046 000 Old_age Always - 0
http://www.zhongyaoit.com/news/industry/315.html文章来源地址https://www.toymoban.com/news/detail-675704.html
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 ,1
smartctl -a -d sat+megaraid,1 /dev/sdc | grep Media_Wearout_Indicator
Wear 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
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