Efs

efs

3. 检查是否用了 Infrequent Access（IA）存储类

   如果你启用了生命周期策略，小文件会被移到 IA 存储类，首次访问延迟高达几十毫秒，会加剧 IO wait 

   。

   建议关闭 IA 或强制把热点文件留在 Standard 存储类

https://www.amazonaws.cn/efs/faq/

references

https://docs.aws.amazon.com/zh_cn/efs/latest/ug/whatisefs.html