Suppose that a basic disk read can sometimes read values that are different from those written. State the type of failure exhibited by a basic disk read. Suggest how this failure may be masked in order to produce a different benign form of failure. Now suggest how to mask the benign failure.

What will be an ideal response?


The basic disk read exhibit arbitrary failures.
This can be masked by using a checksum on each disk block (making it unlikely that wrong values will go undetected) - when an incorrect value is detected, the read returns no value instead of a wrong value - an omission failure.
The omission failures can be masked by replicating each disk block on two independent disks. (Making omission failures unlikely).

Computer Science & Information Technology

You might also like to view...

The netstat command-line tool is effective in detecting viruses and worms.

a. true b. false

Computer Science & Information Technology

A(n) ________ is a note or comment that can be saved or discarded

Fill in the blank(s) with correct word

Computer Science & Information Technology

The value of the type attribute that should be specified for a JavaScript is ________

Fill in the blank(s) with correct word

Computer Science & Information Technology

Which feature of a DBMS allows producing an on-screen or printed document from all or part of a database?

A) access security B) data dictionary C) data recovery D) report generator E) utilities

Computer Science & Information Technology