### Configure raid0 of 700mb and mount it on /common2
# fdisk -l <<--- verify raid partition
# fdisk /dev/sda
create 2 raid partition (type fd) of 350mb each say /dev/sda11 & /dev/sda12
# partprobe -s
# fdisk -l <<---- confirm
# mdadm << just check is command appearing using tab.. if no install it from yum server
# yum –y install mdadm*
# mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sda11 /dev/sda12
# mkfs.ext3 /dev/md0 ß-format md0
# echo “DEVICE /dev/sda11 /dev/sda12 “ > /etc/mdadm.conf
# mdadm --examine --scan --config=/etc/mdadm.conf > > /etc/mdadm.conf
OR
# mdadm –detail –scan >> /etc/mdadm.conf
# cat /proc/mdstat ß verify
# vi /etc/fstab
/dev/md0 /common2 ext3 defaults 0 0
# mount –a
# mount or # df -h ß----varify /common to be have near about 700mb mounted.
If above question will asked for RAID1, just change a single command:
# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda11 /dev/sda12
all other same as above
RAID-1:
# fdisk /dev/sdb
##create 2 raid partition (type fd) of 350mb each say /dev/sdb8 & /dev/sdb9
# partprobe -s
# fdisk -l <<---- confirm
## Create Raid -1
# mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb8 /dev/sdb9
# mkfs.ext3 /dev/md1 ß-format md1
# mdadm --examine --scan --config=/etc/mdadm.conf > > /etc/mdadm.conf
OR
# mdadm –detail –scan >> /etc/mdadm.conf
# cat /proc/mdstat <<- verify
##Mount it on /EXTRA/RAID-1
# mount /dev/md1 /EXTRA/RAID-1
###Recovery -- Suppose my raid partition 8 has been crashed Or have created it for 2 diff disks and my 1 st disk has crashed
## So how to recover data as have craeted mirror RAID, In our case /dev/sd9 conyain mirror data
REcovery on Raid 1:
# umount /dec/mb1
# mdadm --stop /dev/md1
# mount -t ext3 /dev/sdb9 /EXTRA/TEST <-- Have a fun :)
# Remount the RAID
# mdadm --assemble /dev/md1
# mount /dev/md1 /EXTRA/RAID-1
#Simulation
# cat /proc/mdstat
Personalities : [raid0] [raid1]
md1 : active raid1 sdb8[0] sdb9[1]
200704 blocks [2/2] [UU]
md0 : active raid0 sdb7[1] sdb6[0]
305024 blocks 64k chunks
unused devices:
## mdadm --detail /dev/md1
/dev/md1:
Version : 00.90.03
Creation Time : Wed Apr 13 09:58:15 2011
Raid Level : raid1
Array Size : 200704 (196.03 MiB 205.52 MB)
Used Dev Size : 200704 (196.03 MiB 205.52 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Wed Apr 13 10:18:37 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 44493b73:98b654f0:a313390c:1000baf6
Events : 0.2
Number Major Minor RaidDevice State
0 8 24 0 active sync /dev/sdb8
1 8 25 1 active sync /dev/sdb9
##add the new replacement partition to the RAID. It will be resynchronized to the original partition
# mdadm --add /dev/md0 /dev/sda15
# mdadm --detail /dev/md0
# fdisk -l <<--- verify raid partition
# fdisk /dev/sda
create 2 raid partition (type fd) of 350mb each say /dev/sda11 & /dev/sda12
# partprobe -s
# fdisk -l <<---- confirm
# mdadm << just check is command appearing using tab.. if no install it from yum server
# yum –y install mdadm*
# mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sda11 /dev/sda12
# mkfs.ext3 /dev/md0 ß-format md0
# echo “DEVICE /dev/sda11 /dev/sda12 “ > /etc/mdadm.conf
# mdadm --examine --scan --config=/etc/mdadm.conf > > /etc/mdadm.conf
OR
# mdadm –detail –scan >> /etc/mdadm.conf
# cat /proc/mdstat ß verify
# vi /etc/fstab
/dev/md0 /common2 ext3 defaults 0 0
# mount –a
# mount or # df -h ß----varify /common to be have near about 700mb mounted.
If above question will asked for RAID1, just change a single command:
# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda11 /dev/sda12
all other same as above
RAID-1:
# fdisk /dev/sdb
##create 2 raid partition (type fd) of 350mb each say /dev/sdb8 & /dev/sdb9
# partprobe -s
# fdisk -l <<---- confirm
## Create Raid -1
# mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb8 /dev/sdb9
# mkfs.ext3 /dev/md1 ß-format md1
# mdadm --examine --scan --config=/etc/mdadm.conf > > /etc/mdadm.conf
OR
# mdadm –detail –scan >> /etc/mdadm.conf
# cat /proc/mdstat <<- verify
##Mount it on /EXTRA/RAID-1
# mount /dev/md1 /EXTRA/RAID-1
###Recovery -- Suppose my raid partition 8 has been crashed Or have created it for 2 diff disks and my 1 st disk has crashed
## So how to recover data as have craeted mirror RAID, In our case /dev/sd9 conyain mirror data
REcovery on Raid 1:
# umount /dec/mb1
# mdadm --stop /dev/md1
# mount -t ext3 /dev/sdb9 /EXTRA/TEST <-- Have a fun :)
# Remount the RAID
# mdadm --assemble /dev/md1
# mount /dev/md1 /EXTRA/RAID-1
#Simulation
# cat /proc/mdstat
Personalities : [raid0] [raid1]
md1 : active raid1 sdb8[0] sdb9[1]
200704 blocks [2/2] [UU]
md0 : active raid0 sdb7[1] sdb6[0]
305024 blocks 64k chunks
unused devices:
## mdadm --detail /dev/md1
/dev/md1:
Version : 00.90.03
Creation Time : Wed Apr 13 09:58:15 2011
Raid Level : raid1
Array Size : 200704 (196.03 MiB 205.52 MB)
Used Dev Size : 200704 (196.03 MiB 205.52 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Wed Apr 13 10:18:37 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 44493b73:98b654f0:a313390c:1000baf6
Events : 0.2
Number Major Minor RaidDevice State
0 8 24 0 active sync /dev/sdb8
1 8 25 1 active sync /dev/sdb9
##add the new replacement partition to the RAID. It will be resynchronized to the original partition
# mdadm --add /dev/md0 /dev/sda15
# mdadm --detail /dev/md0
