1. Why would moving the first few KB’s of data for a file into the inode (as is

Question

1. Why would moving the first few KB’s of data for a file into the inode (as is possible for many modern filesystems) help small file performance?

2. Why are increasing hard drive sizes reducing the desirability of using RAID?

3. Why don’t we typically use LRU for selecting pages to swap, but typically use LRU for block replacements in the cache?

4. Assuming a 2Ghz. processor and a disk drive with 10ms. average seek time, approximately how many instructions could be executed while waiting for a disk access?

Explanation / Answer

Answe number 4-

1 gigahertz = 1 000 000 000 hertz

2 gigahertz = 2 000 000 000 hertz

number of instructions =2 000 000 000 hertz*average seektime

=2 000 000 000 hertz10*10^-3

=2 000 000 0 processes.

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