SSD FTL 映射粒度是刚好一个 page 吗？ - V2EX
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mokiki
V2EX    SSD

SSD FTL 映射粒度是刚好一个 page 吗？

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  •   mokiki Sep 30, 2021 1906 views
    This topic created in 1681 days ago, the information mentioned may be changed or developed.
    假如一个 page 为 4K，文件系统如果在两个地方各写入 2K 的话，FTL 有可能会优化合并成一个 page 写入以减小写入放大吗？
  • page
  • 写入
  • FTL
  • 粒度
    1 replies    2021-10-01 18:34:39 +08:00
    aeon113
        1
    aeon113  
       Oct 1, 2021 via Android   1
    一般不会。写 512B(1 sector)数据，固件会将整个 4k 数据读到内存，修改其中目标 512B 的数据，然后把 4K 写下去。
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