IT 342 Assignment 8 Due: 10 Apr 2018 1. If you have a system with multiple disk

Question

IT 342 Assignment 8 Due: 10 Apr 2018 1. If you have a system with multiple disk drives, is it better to keep all the paging onone disk le g, the disk holding the OS), or spread the paging over multiple drives? Briely explain your answer. 2. You are accustomed to running a defragmentation utility on your Windows file systems to improve performance (by reducing fragmentation). Would you expect the same kind of improvement from defragging a file system on a solid-state drive Why or why not? 3. Explain why the inade for a file that has been opened by a program does not contain the read/write pointer lindicating where, in the file, the program is working) 4. For a "nix system with disk statistics as shown below Fileayeter /dev/adai dev/adb1 Size Used Arail Use% Inodes luted IFree IUsel Mounted on 472M 357H 92M 80% 122K 333 122K 1% /boot 477M 41M 407M 10% 126K 126K 9 99% /1ount/feB 477N 162M 286M 37% 126K a77 125K 1% /aount/fac /dev/adci How many more 25 Mbyte files can be added before there's an error "Write failed, device full" to sdbl sdel?

Explanation / Answer

Solution:

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1)

In the given case the paging should be stored on multiple disks(one disk). It will improve performance.

why?

Because paging tables are not that big compared to the physical address data they are just a set of rules which are held to direct to the physical address and provide a virtualization of the memory.

If the paging is stored in multiple drives then there will be a performance imporvement, becasue as we know the I/O operations in the disks can be done concurrently and sprerading the page table accross the multiple drives helps us achieve that, the memory requests are served concurrently in a Round Robin fashion.

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