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如何判断 Linux 里的 SSD 还能用多久?一个命令就能查清楚

  • 2026-04-20 10:23:21
如何判断 Linux 里的 SSD 还能用多久?一个命令就能查清楚

SSD(固态硬盘)凭借其高速读写特性,极大提升了计算机系统的运行效率,成为当下主流存储设备。不过你发现没有?使用一段时间后,会感觉到 SSD 速度越来越慢。

(百度来的)从工作原理来看,SSD 基于 NAND 闪存芯片存储数据,数据以 “页” 为单位写入,而擦除操作则以 “块” 为单位。新 SSD 有充足空块,数据写入能迅速完成。可长期使用后,随着数据不断写入、更新与删除,空块逐渐减少。当更新数据时,SSD 需先擦除包含旧数据的块,再写入新数据,这一 “擦除 - 写入” 循环耗时费力。并且,数据碎片化问题会触发 “垃圾回收” 机制,SSD 要花费额外时间整理分散的有效数据,释放被无效数据占据的块空间,这一系列操作都拖慢了读写速度。此外,部分低端 SSD 在缓存耗尽后,读写性能会因直接调用闪存芯片而大幅下滑。(我能说我看不懂吗?)

在 Linux 系统下有多种优化 SSD 性能的手段。开启 TRIM 功能是关键一步,它能让系统及时告知 SSD 哪些数据已被删除,以便 SSD 提前整理块空间,减少后续写入时的擦除操作。

fstrim -v /

若显示磁盘路径及修剪字节数,表明 TRIM 已启用;若提示错误,需编辑 /etc/fstab 文件,在 SSD 分区挂载参数后添加 “discard”(如 “UUID=xxx /ext4 defaults,discard 0 1”),保存后重启系统即可开启。

在使用过程中,尽量避免 SSD 满盘,通过 “df -h” 命令查看磁盘占用情况,确保剩余空间维持在 10%-20%,为垃圾回收和块操作预留充足空间,有助于维持性能稳定。

同时,也要减少不必要的写入,比如关闭不常用的日志功能,编辑 /var/log 下的日志配置文件,降低日志记录级别;或者将临时文件存储到 RAM 磁盘,修改 /etc/fstab 挂载 tmpfs 到 /tmp 目录,以此降低对 SSD 的写入频率,减缓性能衰退。

另外,时刻清楚 SSD 的健康状态与使用情况,对于数据安全和及时更换设备十分必要。比如用smartctl这个工具。

smartctl -s on /dev/sdx #启用设备的 SMART 功能。smartctl -i /dev/sdx 

可获取设备基本信息,如型号、序列号、固件版本等;

smartctl -d ata -H /dev/sda

显示 PASSED代表设备健康,如果是FAILED”则意味着存在问题。

smartctl -t long -a /dev/sda

进行全面检测,可启动长测试,期间用 smartctl -l selftest /dev/sda查看进度。(这里就不演示了。)

通过这些,大致了解 SSD 性能下降原因,积极采取优化措施,并定期检查其健康与使用情况,就能充分发挥 SSD 的性能优势,并延长其使用寿命。

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  1. CONNECT:[ UseTime:0.000594s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000889s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000587s ]
  6. SELECT * FROM `set` [ RunTime:0.000219s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000540s ]
  8. SELECT * FROM `article` WHERE `id` = 484700 LIMIT 1 [ RunTime:0.000497s ]
  9. UPDATE `article` SET `lasttime` = 1776680135 WHERE `id` = 484700 [ RunTime:0.003045s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000242s ]
  11. SELECT * FROM `article` WHERE `id` < 484700 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000487s ]
  12. SELECT * FROM `article` WHERE `id` > 484700 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000376s ]
  13. SELECT * FROM `article` WHERE `id` < 484700 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001023s ]
  14. SELECT * FROM `article` WHERE `id` < 484700 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001290s ]
  15. SELECT * FROM `article` WHERE `id` < 484700 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001704s ]
0.096900s