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File System (:dark_sunglasses:tmpfs (:fire:特点 (:two:可以动态伸缩tmpfs的大小 (…

- - - - sudo ls /lib/modules/3.10.0-514.26.2.el7.x86_64/kernel/fs/
      - :star:中间为uname -r的值
- - - - :explode:大量小文件业务
      - :warning:需要单独安装,默认不支持,维护不方便
    - - :explode:数据库业务
      - :warning:需要单独安装,默认不支持,维护不方便
- - - - :explode:长文件名的前6个字符(不包含空格)+~(代字符)+数字后缀
      - :star:DOS使用的别名
- - - - :moneybag:directory缓存是什么意思:question:
- - - - :pencil2:mount -t tmpfs -o size=50m tmpfs /mnt/tmp1
    - - :pencil2:mount -t tmpfs tmpfs /mnt/tmp
  - - - :pencil2:mount -o remount,size=50m /mnt/tmp
  - - - :explode:而且没有持久化的tmpfs也是一个优点
- - - - :explode:each file occupies a set of contiguous blocks on the disk
      - :moneybag:start location + number of blocks
      - :notes:~~extend~~, waste space, random access
      - :icecream:example
      - :wrench:grow
        
        :icecream:example
        
        :bulb:dynamic-length array implementation
    - - :moneybag:block = pointer + data
      - :notes:no waste of space, ~~random access~~
    - - :explode:the file corresponds with a index table which contains the location of data blocks
      - :notes:overhead of index table, random access
      - :icecream:example
    - - Allocates a disk block by hashing the block
        content to a disk location
  - - - :one:读写磁盘各算一次
      - :two:连续分配插入时选择少的一边
      - :three: