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Thread: What is RAID-5

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    rehanshabbir is offline Senior Member+
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    Post What is RAID-5

    RAID-5 is very popular in todays server machines. I am just Elaborating the magic of this technology so to get the detail knowledge about disk failure rate, perforamance and data recovery techniques you can visit sites like wikipedia.org I'll try to go on simple and smooth way to make my thread understandable.

    In raid-5 minimum 3 disks of same size and specification are used. I am using 3 disk scenario in my post. Fore example if we use 3 disks of 300GB our total disk space equals 900GB but in raid-5 we get 600GB for data and 300 GB for making RAID. Raid-5 uses XOR logical gate. We know that all data in computer is manipulated in binary so data bits are distributed over 2 disks and the result of XOR of first 2 disks is placed over 3rd disk.
    see the following example.

    Disk 1 Disk 2 Disk 3 [disk1 XOR disk2]
    0110 0011 1001

    now consider if disk one fails, we raplace it with a new one then RAID controler device automaticly takes XOR of Disk 2 and Disk 3 and result is re-built over Disk 1. Same procedure occur if any one disk fails. It's the magic of XOR that by taking the XOR of bits of any two disks we will get the bits of
    3rd one. I encourage you to practice it over paper.

    Thanks and ragards.

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    nice sharing plz keep it up....

    ""now consider if disk one fails, we raplace it with a new one then RAID controler device automaticly takes XOR of Disk 2 and Disk 3 and result is re-built over Disk 1.""

    i am confused at this statement plz explane,
    if any one of the HDD fails then how can we add new one....


    regards:-

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    rehanshabbir is offline Senior Member+
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    Default A dead hard disk has no further use

    If Server has hotplug hard disks, Its mean you can plug out defaulty harddisk from server in running condition. Otherwise you have to shut down server to change or replace hard disks. A dead hard disk has no further use, so we replace it with a new hard disk, after that RAID controler starts its work.

    Please do not hasitate to ask if any further confusion.

    best regards

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    thnx my dear....
    really thnx..
    keep in touch.

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    i found a site at net.
    it's really good.....

    http://www.acnc.com/04_01_00.html

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    zafarmarwat is offline Senior Member+
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    ji, janab ketni bar kaha ja chuka hay k yaha threat urdu language me post kia kary, magar aap !!!!!!!!

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    rehanshabbir is offline Senior Member+
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    Quote zafarmarwat said: View Post
    ji, janab ketni bar kaha ja chuka hay k yaha threat urdu language me post kia kary, magar aap !!!!!!!!

    رومن اردو بھی تو منع ہے بھائی

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    jamal-ud-din is offline Junior Member
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    bahi log ab advance dor hay is main raid hona hi nahi chaya
    sahi hayna bahioo ap ki bhainoo

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    sahi baat hy..........

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    Moved to English Zone.....

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