单选题：Look at the fact that requests are not usually uniformly distrib

Look at the fact that requests are not usually uniformly distributed. For example, a cylinder containing the file system FAT can be expected to be accessed more frequently than a cylinder that only contains files. And the fact that file systems typically find data blocks via an indirection table, such as a FAT in DOS. Which of the following ways would take advantage of this indirection to improve disk performance ?@[B](1)
A. Keep the metadata in the nearest corner of cylinders
B. Cache the metadata in primary memory
C. Back up the metadata
D. Redesign the file system by discarding the indirection





A.Keep the metadata in the nearest corner of cylinders
B.Cache the metadata in primary memory
C.Back up the metadata
D.Redesign the file system by discarding the indirection


答案：B