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)
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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