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    Mirroring in Linux

    Updated 20 May 2014

    Here are the steps by which one can do mirroring in Linux running system after installation of the Operating system.

    1. #sudo apt-get install mdadm

    2. Partition the disk

    fdisk -l

    fdisk /dev/sdb (second hard disk)

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    Change the partition type to auto raid (use m for options during partitioning)

    3. creating RAID

    # mdadm –create /dev/md0 –level=mirror –raid-devices=2 /dev/sdb1 /dev/sdc1

    results: mdadm: Defaulting to version 1.2 metadata

    mdadm: array /dev/md0 started

    This will create /dev/md0 virtual drive created from the two real block devices /dev/sdb1 and /dev/sdc1

    4. cat  /proc/mdstat

    Personalities : [raid1]

    md0: active raid1 adc1[1] sdb[0]

    create mdadm.conf

    # sudo mdadm –detail –scan –v > /etc/mdadm/mdadm.conf

    5. Create file system on the RAID

    sudo mkfs.ext4 /dev/md0

    (ignore the errors if come)

    6. sudo mkdir    /data   (creating directory so that we can mount our drive here)

    sudo mount  /dev/md0   /data (mount the virtual drive)

    sudo chmod   777   /data (giving permissions)

    sudo chmod  +t   /data (By doing this other uses can view and add files but only the owner can delete the data)

    # echo “/dev/ md0 /data/ext4 defaults 1 2” >> /etc/fstab (append entries in fstab)


    your mirror is ready…. enjoy 😛


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