# uname -a
Linux localhost 3.10.0-123.el7.x86_64 #1SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
# cat /etc/redhat-release
CentOS Linux release 7.0.1406 (Core)
3. 具体操作3.1. 分区
# fdisk -l
Disk /dev/sdc: 32.2 GB, 32212254720 bytes,62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk /dev/sdd: 32.2 GB, 32212254720 bytes,62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
.........
# fdisk /dev/sdc
..........
Command (m for help): p
Disk /dev/sdc: 32.2 GB, 32212254720 bytes,62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk label type: dos
Disk identifier: 0x3dbf19dc
Device Boot Start End Blocks Id System
Command (m for help): n
Partition type:
p primary (0 primary, 0extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-62914559, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G}(2048-62914559, default 62914559):
Using default value 62914559
Partition 1 of type Linux and of size 30GiB is set
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linuxraid autodetect'
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# fdisk -l/dev/sdc
Disk /dev/sdc: 32.2 GB, 32212254720 bytes, 62914560sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk label type: dos
Disk identifier: 0x3dbf19dc
Device Boot Start End Blocks Id System
/dev/sdc1 2048 62914559 31456256 fd Linux raid autodetect
对/dev/sdd进行同样的分区操作
# fdisk -l/dev/sdd
Disk /dev/sdd: 32.2 GB, 32212254720 bytes,62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk label type: dos
Disk identifier: 0x2b1e2fef
Device Boot Start End Blocks Id System
/dev/sdd1 2048 62914559 31456256 fd Linux raid autodetect
3.2. 创建RAID1
# mount /dev/cdrom /mnt/cdrom
mount: /dev/sr0 is write-protected,mounting read-only
# cd/mnt/cdrom/Packages
# ls md*
mdadm-3.2.6-31.el7.x86_64.rpm
# rpm -Uvhmdadm-3.2.6-31.el7.x86_64.rpm
error: Failed dependencies:
libreport-filesystem is needed by mdadm-3.2.6-31.el7.x86_64
#rpm -Uvh mdadm-3.2.6-31.el7.x86_64.rpmlibreport-filesystem-2.1.11-10.el7.centos.x86_64.rpm
Preparing... ################################# [100%]
Updating / installing...
1:libreport-filesystem-2.1.11-10.el################################# [50%]
2:mdadm-3.2.6-31.el7 ################################# [100%]
# mdadm -c/dev/md0 -l 1 -n 2 /dev/sd[cd]1
mdadm: -c does not set the mode, and socannot be the first option.
[root@localhost Packages]# mdadm --create/dev/md0 -l 1 -n 2 /dev/sd[cd]1
mdadm: Note: this array has metadata at thestart 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.
3.3. 创建文件系统
格式化磁盘阵列
# mkfs.ext4/dev/md0
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1966080 inodes, 7859936 blocks
392996 blocks (5.00%) reserved for thesuper user
First data block=0
Maximum filesystem blocks=2155872256
240 block groups
32768 blocks per group, 32768 fragments pergroup
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystemaccounting information: done
#mkdir /data
# mount /dev/md0 /data
# ll /data
total 16
drwx------ 2 root root 16384 Aug 15 03:01lost+found
设置开机自动挂载
# vi /etc/fstab
在最后添加一行
/dev/md0 /data ext4 defaults 0 0
# mdadm -Ds
ARRAY/dev/md0 metadata=1.2 name=localhost:0 UUID=e236da40:5469327f:1683de23:2d391d6f
写入到配置文件
# mdadm -Ds>> /etc/mdadm.conf
重启验证
#reboot
# mount
/dev/md0 on /data type ext4(rw,relatime,data=ordered)
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdd1[1] sdc1[0]
31439744 blocks super 1.2 [2/2] [UU]
unused devices: <none>
4. 模拟故障将30GA.vmdk删除
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1]
31439744 blocks super 1.2 [2/1] [_U]
unused devices: <none>
5. 重建RAID1
模拟恢复，还是30GB的硬盘，添加新的磁盘文件将30GC.VMDK
# fdisk -l
# mdadm /dev/md0 -a /dev/sdc1
mdadm: added /dev/sdc1
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[2] sdd1[1]
31439744 blocks super1.2 [2/1] [_U]
[==>..................] recovery = 11.3% (3554240/31439744) finish=2.2min speed=209072K/sec
unused devices: <none>
查看日志
md: bind<sdc1>
md: recovery of RAID array md0
md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than200000 KB/sec) for recovery.
md: using 128k window, over a total of 31439744k.
