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在NDMP还原日志中、什么是inomap缓存命中和缓存未命中?

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适用场景

ONTAP 9

问题解答

  • 在NDMP还原日志中、有一行列出了VM inomap 缓存命中和未命中:
(VM inomap  : Cache hits (            56634222), Cache misses (            14994008))
  • 索引 节点映射会将备份映像中的索引节点编号映射到要还原数据的文件系统上的索引节点编号。
  • 缓存用于加快此映射过程。
  • 缓存命中 数:表示在缓存中找到所请求数据的次数。缓存命中次数较多通常意味着恢复过程可以更快地进行、因为缓存中随时提供必要的Inode信息、从而减少了从速度较慢的磁盘或磁带介质读取数据的需要。
  • 缓存未命中 次数:表示在缓存中找不到请求的数据的次数、需要从底层存储介质提取数据。由于系统必须从磁盘或磁带中检索索引节点信息、而这比访问缓存要慢、因此缓存未命中可能会减慢还原过程的速度。

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