RAID
Redundant Array Of Inexpensive Disk
RAID is a series of disk which can save your data even if there is catastrophic failure on one of the disk
RAID are classified as RAID0, RAID1 and RAID 5
RAID 0 : require minimum 2 HDD and also known as stripping without parity
RAID 1: require minimum 2 HDD and also known as disk mirroring
RAID 5: minimum 3 HDD requirement and also known as stripping with parity
First we create the two partition say each of 100MB and then change its type to (‘fd’) Raid
Now we create a RAID
#mdadm –C /dev/md0 –level=1 –raid-disks=2 /dev/hda8 /dev/hda9
Now check the raid
#cat /proc/mdstat
‘OR’
#mdadm --detail /dev/md0
Format the newly created RAID
#mkfs.ext3 /dev/md0
Now mount it
#mkdir /raid
#mount /dev/md0 /raid
In order to check first we fail any one of the partition
#mdadm --manage /dev/md0 --fail /dev/hda8
Check the status of the RAID
#mdadm --detail /dev/md0
Removing the failure partition
#mdadm --manage /dev/md0 --remove /dev/hda8
To add new disk partition
#mdadm --manage /dev/md0 --add /dev/hda10
Note:
In order to add new partition first we create the partition and change its type to ‘fd’