Nt1310 Unit 7 Parity Analysis

Improved Essays
RAID level 5 works with any number of disk equal or greater than 3 and places a parity sum on one disks in the set to be able to recover from a disk failure. (Striped blocks with distributed parity.) The parity calculations are done in a RAID 5 set using XOR. We assume a small RAID 5 set of four disks and some data is written to it. On the first three disks we have the binary information 1010, 1100 and 0011, here representing some data, and now calculate the parity information for the fourth disk.

We use XOR operation to calculate the Parity bit:
For the first column of the disks, to the left we have 1, 1 and 0:
1XOR 1 XOR 0 = Parity bit
Broken down: 1 XOR 1 = 0 and then 0 XOR 0 = The parity bit is 0.
This means first 1 XOR 1
If any of Disk number 1, 2 or 3 break the parity information on Disk 4 is to be used to recreate the missing data. If we assume that disk number 2 unexpectedly goes down we have lost all read and write access to the real Disk 2, however with the help of the already recorded parity we calculate the information which is missing.

The primary feature in a RAID 5 disk set is to be able to access the data on a missing disk. This is done by using the exact same XOR operation over the remaining disks and the parity information. Let us look at the first column again. 1 XOR 0 = 1 (for disk 1 and disk 3) and then 1 XOR 0 (the parity) = 1. This means that there must have been a binary digit of 1 on the missing disk. If we do the same operation on the other columns we will end up with 1100, which is exactly the same data that was on the failed

Related Documents

• Improved Essays

Amazon 5 Bullet Points: MONITOR LOVED ONES OR PATIENTS REMOTELY: Receive instant alerts when a loved one or patient exits the chair to enabling you to provide immediate assistance to reduce falls and prevent injuries. EASY SET UP: Easy to use sensor pad connection is wireless for convenience and portability for use in different settings. Alarm is easily reset by reapplying pressure to the sensor pad or turning off the alarm setting. COMFORTABLE WATERPROOF PAD:…

• 1039 Words
• 5 Pages
Improved Essays
• Decent Essays

Assignment 2 COLLAPSE I was in microcenter today looking to buy a new Netbook because my tablet PC hade broking touch screen and Wi-Fi network problem, when I get there I surprise that they can repair many devices like computers and tablet PC like Microsoft surface , hardware and software problems they work in OSX and windows and android operation system ,also they do data backup in hard drive and flash drive if you lows your data , in this case the price up to how many GB(gigabyte) you want a backup . I buy new netbook with high RAM, CPU (Central Processing Unit) 2.8 GHz processor speed, Hard Drive capacity 200 GB, good Webcam with 10.1 in touch screen I’m very happy . week 3 short story COLLAPSE Before last week I was doing all lot…

• 348 Words
• 2 Pages
Decent Essays
• Improved Essays

a space containing both an up and down arrow represents a filled orbital. Each box is labeled with the principal quantum number and sub level associated with the orbital. Sub level P has three spaces and is one behind, sub level D has five spaces and is two behind. Each line must have all up arrows before going through and adding down arrow. For example carbon's orbital diagram is (C) 1s2 contains both up and down arrows, along with 2s2.…

• 605 Words
• 3 Pages
Improved Essays
• Decent Essays

It handles data errors. Switches operate on this…

• 442 Words
• 2 Pages
Decent Essays
• Decent Essays

\$s3 (i ? n) #beq \$t0, \$zero, load1 # go to exit1 if \$s0 ? \$s3 (i ? n) subi \$s1, \$s0, 1 # j = i – 1 for2tst: slti \$t0, \$s1, 0 # \$t0 = 1 if \$s1 < 0 (j < 0) bne \$t0, \$zero, load2 # go to exit2 if \$s1 < 0 (j < 0) sll \$t1, \$s1, 2 # \$t1 = j * 4 add \$t2, \$s2, \$t1 # \$t2 = v + (j * 4) lw \$t3, 0(\$t2)…

• 695 Words
• 3 Pages
Decent Essays
• Decent Essays

• 296 Words
• 2 Pages

Task 2 SCSI SCSI is a Small computer system interface which is usually used for disk drives. It can support up to 8 devices or 16 devices with a wide SCSI. The use can have a n SCSI adapter expansion card with either an internal or external connection. After this adapter has been installed, this will then allow more than multiple SCSI devices to be installed within the computer. This was mainly designed for apple but can be used for computers but many have switched to SATA drives.…

• 296 Words
• 2 Pages
Decent Essays
• Decent Essays

The following data is received from a real-time measuring device and is stored at memory location Data1. You are required to write an assembly language program segment with the corresponding data definition directives that would extract the data items and store them at memory locations Day, Month, Year, Temperature and Pressure. [10 points] 5 bits 4 bits 7 bits 8 bits 8 bits Day Month Year Temperature Pressure Write an assembly language program for the following HLL code: [10 Points] unsigned int crc32(const char* data, size_t length) { const unsigned int POLY = 0xEDB88320; unsigned int reminder = 0xFFFFFFFF; for(size_t i = 0; i < length; i++){ reminder ^= (unsigned char)data[i]; // must be zero extended for(size_t bit = 0; bit…

• 144 Words
• 1 Pages
Decent Essays
• Decent Essays

IGN (InGame Name): PolloWangs (IRL Name : Matt) Date of application: Wednesday, August 10, 2016 Age: 16 turning 17 soon. Country: USA Time zone: Eastern EST InGame ranks (Mine rank and Donation Rank,only if you have one): Sadly I am not a donor but Ive spent a lot of time on the Prison Server and I'm rank Meow :) 1. Why do you want to be staff?…

• 527 Words
• 3 Pages
Decent Essays
• Decent Essays

The third application software is mapping. Mapping application, are those that display street maps or satellite, and are usually used to locate places and directions. The most extensive mapping application is Google maps. When it comes to the location based software it uses your current location, and shows you the closest restaurants, shops, banks, etc. these software's are available for desktops, laptops, and handheld computers.…

• 223 Words
• 1 Pages
Decent Essays
• Improved Essays

ii. Give the id the absolute minimum privileges necessary to host the site on the web server. For example, it’s more likely than not read access to the website itself, write access only to folders updated by the web site, etc. iii. Change IIS so that the domain account is utilized to run the application.…

• 456 Words
• 2 Pages
Improved Essays
• Improved Essays

Opening Statement Written policies provide a means of security within organization. It establishes the regulations that all faculty must adhere to in order to protect important company and client information. The organizational policies should be read by and signed by each employee as a consensus that all regulations will be followed once joining the organization. And, for those who are current employees, to keep abreast of any amendments made to current policy, so that all employees are in compliance. These policies should be kept in an accessible place for everyone to read, so no one will be left out of the loop.…

• 586 Words
• 3 Pages
Improved Essays
• Decent Essays

1762-IF4 is an Allen Bradley MicroLogix 1200 System with 4 Channel Current/Voltage Analog Input Module. It has a dimension of 90 x 87 x 40.4 mm. It has Delta-Sigma converter and 4 differential (bipolar) inputs. It’s analog operating voltage range is -10 – 10 V DC normal and -10.5 – 10.5 V DC full scale. It’s analog operating current range is 4 – 20 mA normal and -21 – 21 mA full scale.…

• 264 Words
• 2 Pages
Decent Essays
• Improved Essays

The numbers one and zero are very versatile, because one is white and zero is black. This means that the numbers can compliment…

• 862 Words
• 4 Pages
Improved Essays
• Great Essays

Case Study Assignment – I Campbellsville University MASSIVE DATABASE MASTERING - MASTERCARD INTERNATIONAL Various affiliations are endeavoring to address the open entryways and limit challenges related with "huge data." Industry masters gage that the total volume of data is increasing at general interims and most by a wide margin of new data being delivered is prepared to go spaces. MasterCard Universal (www.mastercard.com) is not any more impossible to miss to think about the issues identified with monstrous databases. MasterCard has amassed a data circulation focus that is more than 100-terabytes in size. Insiders expect that it will create to more than 1.8 petabytes.…

• 933 Words
• 4 Pages
Great Essays
• Great Essays

The Tech-Shift Dilemma/Predicament at TAS Technology. My Description of the Organization: The company TAS Technology is a market leader in data analysis or analytics products or goods and has been for over 30 years. It was established in 1976, and is considered one of the earliest companies on the planet to actually put analytics to commercial use (non-free).…

• 1574 Words
• 7 Pages
Great Essays