Configure RAID 12015/10/23 |
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Configure RAID 1 to add 2 new HDDs on a server.
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| [1] | This example is based on the environment below. The new HDD sdb and sdc are newly added on it and configure RAID 1. |
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[root@dlp ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 196G 1.2G 195G 1% / devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 1.9G 8.5M 1.9G 1% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/sda1 497M 222M 276M 45% /boot |
| [2] | Create a partition on new HDD and set RAID flag. |
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[root@dlp ~]# parted --script /dev/sdb "mklabel gpt" [root@dlp ~]# parted --script /dev/sdc "mklabel gpt" [root@dlp ~]# parted --script /dev/sdb "mkpart primary 0% 100%" [root@dlp ~]# parted --script /dev/sdc "mkpart primary 0% 100%" [root@dlp ~]# parted --script /dev/sdb "set 1 raid on" [root@dlp ~]# parted --script /dev/sdc "set 1 raid on"
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| [3] | Configure RAID 1. |
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[root@dlp ~]#
[root@dlp ~]# yum -y install mdadm mdadm --create /dev/md0 --level=raid1 --raid-devices=2 /dev/sdb1 /dev/sdc1
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
# show status [root@dlp ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
83818496 blocks super 1.2 [2/2] [UU]
[======>..............] resync = 31.0% (26044416/83818496) finish=4.7min speed=201190K/sec
unused devices: <none>
# after few hours later, status turns like follows if syncing finished [root@dlp ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
83818496 blocks super 1.2 [2/2] [UU]
unused devices: <none>
[root@dlp ~]#
vi /etc/sysconfig/raid-check # line 57: add RAID devices which you'd like to check by Cron CHECK_DEVS=" md0 "
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| [4] | For example, if a member HDD in RAID array would be failure, re-configure RAID 1 like follows. |
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# the status is like follows in failure [root@dlp ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active (auto-read-only) raid1 sdb1[0]
83818496 blocks super 1.2 [2/1] [U_]
unused devices: <none>
# after swapping new disk, re-configure like follows [root@dlp ~]# mdadm --manage /dev/md0 --add /dev/sdc1
mdadm: added /dev/sdc1
[root@dlp ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
83818496 blocks super 1.2 [2/2] [UU]
[======>..............] resync = 31.0% (26044416/83818496) finish=4.7min speed=201190K/sec
unused devices: <none>
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