操作
分区:
[root@localhost ~]# fdisk -l
Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdc: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdd: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
fdisk /dev/sdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
[root@localhost ~]# fdisk /dev/sdb
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): fd
Changed system type of partition 1 to fd (Linux raid autodetect)
建立raid1
[root@localhost ~]# mdadm -C /dev/md0 -l 1 -n 2 /dev/sd[bc]1
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? yes
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
创建文件系统
格式化:
[root@localhost ~]# mkfs.ext4 /dev/md0
[root@localhost ~]# mkdir /data/
[root@localhost ~]# mount /dev/md0 /data/
[root@localhost ~]# ll /data/
total 16
drwx------ 2 root root 16384 Aug 5 11:16 lost+found
[root@localhost ~]# vi /etc/fstab
在最后添加如下内容
drwx------ 2 root root 16384 Aug 14 15:21 lost+found
[root@localhost ~]# mdadm -Ds
ARRAY /dev/md0 metadata=1.2 name=localhost.localdomain:0 UUID=c00e8204:a51e89ea:f6069fbe:9350ed9a
写入配置文件
[root@localhost ~]# mdadm -Ds >> /etc/mdadm.conf
重新启动
[root@localhost ~]# reboot
[root@localhost ~]# mount
/dev/mapper/VolGroup-lv_root on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
/dev/md0 on /data type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
模拟故障
[root@localhost ~]# mdadm /dev/md0 -a /dev/sdb1
mdadm: added /dev/sdb1
[root@localhost ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[2] sdc1[1]
20948288 blocks super 1.2 [2/1] [_U]
[=====>...............] recovery = 28.7% (6021952/20948288) finish=1.5min speed=159484K/sec
unused devices: