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Create RAID on previous versions of RedHat Linux
1. Create RAID partition
We can create RAID partitions either at the time of, or after Red Hat Linux installation. Let us assume that we have three SATA hard disks: /dev/sda, /dev/sdb, and /dev/sdc. Of these, Red Hat Linux is installed on /dev/sda. (Here we have assumed three disks. While we also can use three RAID partitions instead, which we could create at the time of installation). Using partitions does not ensure survival of data in case of physical damage to the disk.
To start with, we must have two or more partitions of roughly the same size. Once we have sufficient partitions for our RAID array, we can use fdisk to change partition type, suitable for RAID ( i.e. fd ).
Note: Changing the partition type, can destroy all the currently stored data on this partition.
After creating the partitions for RAID, we will have to format them. For example:
# mkfs -t ext3 /dev/sdc1
Or,
# mkfs -j /dev/sdc1
Repeat the above process of formatting for all the RAID partitions.
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