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2. Configure RAID using /etc/raidtab
After creating RAID partitions, we will have to configure /etc/raidtab file, which is very simple to configure. For configuring any of RAID level we will have to edit this file only. There are few pre defined commands to use in this file, which are as follows:
Commands used in /etc/raidtab
Command Details
raiddev: File name of RAID device
raid-level: RAID level, generally 0, 1 or 5
persistent-superblock 1: to detect this RAID array
chunk-size: Amount of data in KB, to be read or written
nr-raid-disks: Number of disks assigned to this array
nr-spare-disks: Number of extra disks assigned to this array
device: RAID partition device name
raid-disk Number (starting with 0): assigned to the partition in RAID array
spare-disk Number (starting with 0): assigned to the reserve partition in RAID array
Examples of configuring /etc/raidtab for different RAID levels:
# vi /etc/raidtab (To edit raidtab file)
RAID 0
To configure this level we will assume that we have two partitions named as /dev/sdb1 and /dev/sdc1. We also assume that we want to setup a chunk size of 16 KB:
raiddev /dev/md0
raid-level 0
persistent-superblock 1
chunk-size 16
nr-raid-disks 2
nr-spare-disks 0
device /dev/sdb1
raid-disk 0
device /dev/sdc1
raid-disk 1
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