Operating System question please

[kristb17]

I am currently doing a past paper on Operating Systems and have a few questions which i really do not understand how i could get the answer. Could someone explain an answer to me please?

thanks

“The XYZ operating system uses both segmentation and demand-paged virtual memory. It supports up to 256 segments per process. Each segment uses a 24-bit virtual address with 4096-byte page frames. The page replacement strategy is NRU (not recently used). The paging store may be a single file on a user volume, or distributed across several files on one or more volumes.”

a) Calculate the maximum number of pages available to a process in this operating system.

A disk has 200 tracks and the request queue for tracks contains, in the order received, 55, 58, 39, 18, 90, 160.  Assuming that the disk arm is initially at track 100 and that no more requests arrive until all entries in the queue have been serviced then determine the average seek time for the disk-scheduling algorithms known as SSTF and SCAN (elevator).  For each algorithm identify one weakness of that algorithm.

RAID systems are now commonly used to provide reliability, efficiency and fault tolerance.  The following schematic diagram is typical of what is known as RAID-3.  Discuss the advantages and disadvantages of such a configuration and suggest one way in which it could be improved.  						  [4 marks]
1		2		3		1 XOR 2 XOR 3
4		5		6		4 XOR 5 XOR 6
7		8		9		7 XOR 8 XOR 9
…		…		…		…

thanks

[fingal]

We don't do course work questions on here. The best place you can go is the library! Or other students?

[gtmtnbiker98]

This violates forum rules!

[techieMoe]

We will not do your homework for you.

http://www.linuxforums.org/forum/lin...ums-rules.html