Assignment # 6 CS609 has been uploaded. Its due date is 06 -02- 2013. Please discuss here about the assignment
Please read the following instructions carefully before submitting assignment:
It should be clear that your assignment will not get any credit if:
The objective of this assignment is to enhance your knowledge about;
What advantage and disadvantage do we get if Bytes per Sector used in a file system is too small/large? Your answer shall be in the following tabular format.
No. of Bytes per Sector is Small
No. of Bytes per Sector is Large
Let suppose we have to store files on a hard disk having sizes given as below.
840 Bytes, 1790 Bytes, 650 Bytes, 2470 Bytes and 2840 Bytes.
You have to choose an optimal size of sector on your disk which also referred as Bytes per Sector or Block Size. You have the choice to choose the Sector size only from typical values 512 Bytes, 1024 Bytes or 2048 Bytes. Do not make random guess, do some calculations and report them in your solution. Based on your calculations, answer the following questions with reasons stated briefly.
Question No.1: What Block size will you choose if the objective is to have optimal disk space utilization?
Question No.2: What Block size will you choose if the objective is to have reduced access time?
You are required to submit a single MS word file through LMS.
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Here is an extract : Read yourself , Hope you will find it a great help in solving Part a of assignment..
With these new types of media, there are key impacts to performance, resiliency, functionality, and even to deployment scenarios.
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In computing (specifically data transmission and data storage), a block is a sequence of bytes or bits, having a nominal length (a block size). Data thus structured are said to be blocked. The process of putting data into blocks is called blocking. Blocking is used to facilitate the handling of the data-stream by the computer program receiving the data. Blocked data is normally read a whole block at a time. Blocking is almost universally employed when storing data to 9-track magnetic tape, to rotating media such as floppy disks, hard disks, optical discs and to NAND flash memory.
Most file systems are based on a block device, which is a level of abstraction for the hardware responsible for storing and retrieving specified blocks of data, though the block size in file systems may be a multiple of the physical block size. In classical file systems, a single block might contain only a part of a single file. This leads to space inefficiency due to internal fragmentation, since file lengths are often not integer multiples of block size, and thus the last block of files will remain partially empty. This will create slack space, which averages half a block per file. Some newer file systems attempt to solve this through techniques called block suballocation and tail merging.
Block storage is normally abstracted by a file system or database management system (DBMS) for use by applications and end users. The physical or logical volumes accessed via block I/Omay be devices internal to a server, directly attached via SCSI or Fibre Channel, or distant devices accessed via a storage area network (SAN) using a protocol such as iSCSI, or AoE. DBMSes often use their own block I/O for improved performance and recoverability as compared to layering the DBMS on top of a file system.
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but sadan in first part we are just req to ans about tha advantage and disadvantage
if any body need help then contact with me. i solved both , plz dont ask to sahre idea solution.
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Access time is the time delay or latency between a request to an electronic system, and the access being completed or the requested data returned.
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