Rotational Delay

Page Size
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Page Size

The page size is sometimes a parameter that can be chosen by the operating system. Even if the hardware has been designed with, for instance, 512-byte pages, the operating system can easily regard page pairs 0 and 1, 2 and 3, 4 and 5, and so on, as 1-KB pages by always

FILE SYSTEM MANAGEMENT AND OPTIMIZATION
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FILE SYSTEM MANAGEMENT AND OPTIMIZATION

Making the file system work is one thing; making it work efficiently and robustly in real life is another thing. In the following sections we will examine some of the issues involved in managing disks.

Disk Arm Scheduling Algorithms
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Disk Arm Scheduling Algorithms

Now we will consider some issues related to disk drivers in general. First, look at how long it takes to read or write a disk block. The time needed is determined by three factors:For most disks, the seek time dominates the other two times, so reducing the mean seek time can improve system performance considerably.

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