Configure RAID 12021/04/14 |
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Configure RAID 1 to add 2 new Disks on a computer.
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| [1] | This example is based on the environment like follows. It shows to install new Disks [sdb] and [sdc] on this computer and configure RAID 1. |
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[root@dlp ~]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.8G 0 3.8G 0% /dev tmpfs 3.8G 0 3.8G 0% /dev/shm tmpfs 3.8G 8.6M 3.8G 1% /run tmpfs 3.8G 0 3.8G 0% /sys/fs/cgroup /dev/mapper/cs-root 71G 2.6G 69G 4% / /dev/sda1 1014M 322M 693M 32% /boot tmpfs 777M 0 777M 0% /run/user/0 |
| [2] | Create a partition on new Disks 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 ~]# 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]
83817472 blocks super 1.2 [2/2] [UU]
[=>...................] resync = 6.7% (5697984/83817472) finish=9.3min speed=138975K/sec
unused devices: <none>
# status turns like follows if syncing finished # that's OK to configure RAID 1 [root@dlp ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
83817472 blocks super 1.2 [2/2] [UU]
unused devices: <none>
[root@dlp ~]#
vi /etc/sysconfig/raid-check # line 57 : add RAID device to check by Cron # for Cron setting, it's [/etc/cron.d/raid-check] CHECK_DEVS=" md0 "
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| [4] | To use RAID device, Ceate any filesystem and mount it as usual. |
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# for example, format with xfs and mount it on /mnt [root@dlp ~]# mkfs.xfs /dev/md0
meta-data=/dev/md0 isize=512 agcount=4, agsize=5238592 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=1 inobtcount=1
data = bsize=4096 blocks=20954368, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=10231, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
Discarding blocks...Done.
[root@dlp ~]# mount /dev/md0 /mnt [root@dlp ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 4.0M 0 4.0M 0% /dev tmpfs tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs tmpfs 1.6G 8.6M 1.6G 1% /run /dev/mapper/cs-root xfs 71G 2.2G 69G 3% / /dev/vda1 xfs 1014M 240M 775M 24% /boot tmpfs tmpfs 794M 0 794M 0% /run/user/0 /dev/md0 xfs 80G 603M 80G 1% /mnt # to set in fstab # because the name of md*** sometimes changes when hardwares are changed, set it with UUID [root@dlp ~]# blkid | grep md /dev/md0: UUID="34957f99-1df9-4119-b080-8aaa3a2a80ff" TYPE="xfs"
[root@dlp ~]#
vi /etc/fstab # set with UUID
/dev/mapper/cs-root / xfs defaults 0 0
UUID=a182e1b1-d17d-4bb8-89cd-77c87288674e /boot xfs defaults 0 0
/dev/mapper/cs-swap none swap defaults 0 0
UUID=34957f99-1df9-4119-b080-8aaa3a2a80ff /mnt xfs defaults 0 0
# that's OK, even if the name of md*** are changed, it is mounted normally [root@dlp ~]# df -hT /mnt Filesystem Type Size Used Avail Use% Mounted on /dev/md127 xfs 80G 603M 80G 1% /mnt |
| [5] | If a member Disk in RAID array would be failure, re-configure RAID 1 like follows after swapping new Disk. |
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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]
83817472 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[2] sdb1[0]
83817472 blocks super 1.2 [2/1] [U_]
[>....................] recovery = 2.4% (2028736/83817472) finish=8.7min speed=156056K/sec
unused devices: <none>
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