Parity Error Checking Raid
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What Is Parity Bit
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storage, planning and management HPC storage Outsourced storage and storage service providers Small business storage Storage management jobs and salaries Storage market research reports Storage vendors Topics Archives View All Storage Resources Please select a category Cloud Storage Data Backup Data Protection Data Storage Management NAS (network attached storage) Object storage Primary Storage or Storage Hardware SAN (storage area network) Storage and Virtualization Storage Strategy Topics Archives Section Get Started News Get Started Evaluate Manage Problem Solve Sponsored Communities Home RAID Computing fundamentals parity Definition parity Posted by: Margaret Rouse WhatIs.com Contributor(s): Ed Hannan Share this item with your network: Sponsored News Why HC Lets You Rest Easy with Better Resiliency and Data Protection –SimpliVity Cloud-Based Disaster Recovery –CommVault See More Vendor Resources The Past, Present, and Future of RAID Data Protection –SearchCloudStorage.com How to Select the Correct RAID for an EqualLogic SAN –Dell India In computers, parity (from the Latin paritas, meaning equal or equivalent) is a technique that checks whether data has been lost or written over when it is moved from one place in storage to another or
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn http://superuser.com/questions/287680/how-does-parity-work-on-a-raid-5-array more about Stack Overflow the company Business Learn more about hiring developers or posting http://www.techrepublic.com/article/picking-apart-parity-problems/ ads with us Super User Questions Tags Users Badges Unanswered Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and what is rise to the top How does parity work on a RAID-5 array? up vote 18 down vote favorite 4 I'm looking to build a nice little RAID array for dedicated backups. I'd like to have about 2-4TB of space available, as I have this nasty little habit of digitizing everything. Thus, I need a lot of storage and a lot of redundancy in case of drive failure. I'll also essentially what is parity be backing up 2-3 computers' /home folders using one of the "Time Machine" clones for Linux. This array will be accessible over my local network via SSH. I'm having difficulties understanding how RAID-5 achieves parity and how many drives are actually required. One would assume that it needs 5 drives, but I could be wrong. Most of the diagrams I've seen have only yet confused me. It seems that this is how RAID-5 works, please correct me as I'm sure I'm not grasping it properly: /---STORAGE---\ /---PARITY----\ | DRIVE_1 | | DRIVE_4 | | DRIVE_2 |----| ... | | DRIVE_3 | | | \-------------/ \-------------/ It seems that drives 1-3 appear and work as a single, massive drive (capacity * number_of_drives) and the parity drive(s) back up those drives. What seems strange to me is that I usually see 3+ storage drives in a diagram to only 1 or 2 parity drives. Say we're running 4 1TB drives in a RAID-5 array, 3 running storage and 1 running parity, we have 3TB of actual storage, but only have 1TB of parity!? I know I'm missing something here, can someone help me out? Also, for my use case, what would be better, RAID-5 or RAID-6? Fault t
United States Australia United Kingdom Japan Newsletters Forums Resource Library Tech Pro Free Trial Membership Membership My Profile People Subscriptions My stuff Preferences Send a message Log Out TechRepublic Search GO Topics: CXO Cloud Big Data Security Innovation Software Data Centers Networking Startups Tech & Work All Topics Sections: Photos Videos All Writers Newsletters Forums Resource Library Tech Pro Free Trial Editions: US United States Australia United Kingdom Japan Membership Membership My Profile People Subscriptions My stuff Preferences Send a message Log Out Data Centers Picking apart parity problems What you don't know about parity errors can hurt you. So, while a fundamental understanding of the different RAID levels is good, knowing how to diagnose and prevent parity errors is better. Scott Lowe teaches you both in this Daily Drill Down. By Scott Lowe MCSE | May 17, 2002, 12:00 AM PST RSS Comments Facebook Linkedin Twitter More Email Print Reddit Delicious Digg Pinterest Stumbleupon Google Plus Anyone who has worked with RAID (redundant array of independent disks) has heard the term “parity.” While most IT pros understand the general concept behind the word, many would be hard-pressed to define exactly what parity is or how to fix problems associated with it when they occur. Parity is a form of error correction commonly used in certain levels of RAID and works to reconstruct data on a drive that has failed in an array. In this article, I will be focusing on parity problems commonly associated with RAID levels 3, 4, 5, and 6. The remaining RAID levels either do not use parity or are not as commercially viable as levels 3 through 6.First, a lesson on the different RAID levelsDifferent levels of RAID make use of physical disks in diverse ways. Each RAID level that supports error correction (parity) uses the capability in different ways as well. Table A explains these differences, as well as what can happen when a drive or drives in a RAID array fail.Table A Common name Parity used Description Array's capacity Data reliability Minimum drives required Failure condition Disk striping No The data is broken down into blocks, and each block is written to a separate disk. Since t