CONAP-141621：大型目录可能会导致严重的性能问题

问题描述

When the storage system needs to work with the contents of any directory, it must load all the directory's blocks into memory. A large directory must occupy many buffers in the memory of the storage controller. Loading a directory involves reading blocks from the disks, which results in I/O load and processor time. If there are many large directories in a file system, the effects noted above might be multiplied, causing severe performance issues.