Operating System Practice Test 8

1. Which buffer holds the output for a device?

2. The mount mechanism ________ a transitive property.

3. A consistency checker __________________ and tries to fix any inconsistencies it finds.

4. In the optimized technique for sequential access ___________ removes a page from the buffer as soon as the next page is requested.

5. With _______ a requested page and several subsequent pages are read and cached.

6. Consider a disk where blocks 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 17, 18, 25, 26 and 27 are free and the rest of the blocks are allocated. Then the free space bitmap would be _____________

7. ____________ writes occur in the order in which the disk subsystem receives them, and the writes are not buffered.

8. ___________ mounts, is when a file system can be mounted over another file system, that is remotely mounted, not local.

9. The data-in register of I/O port is ____________

10. To recover from failures in the network operations _____________ information may be maintained.

11. A file being read or written sequentially should not have its pages replaced in LRU order, because _____________

12. The server maintains a/an ________ that specifies local file systems that it exports for mounting, along with names of machines that are permitted to mount them.

13. _______ and ________ are the most common strategies used to select a free hole from the set of available holes.

14. What is a circular buffer?

15. In the world wide web, a ____ is needed to gain access to the remote files, and separate operations are used to transfer files.

16. A _________ directory is mounted over a directory of a _______ file system.

17. The VFS (virtual file system) activates file system specific operations to handle local requests according to their _______

18. Once the changes are written to the log, they are considered to be ________

19. By preallocating the inodes and spreading them across the volume, we ___________ the system performance.

20. For each file there exists a ___________ that contains information about the file, including ownership, permissions and location of the file contents.