Linux中raid的創建步驟：
1、添加硬盤
Raid設備的成員是硬盤分區，需要先對硬盤分區，分區不能同一個物理硬盤上
2、安裝Raidtools工具
raidtools中包含有raid創建管理工具和默認的示範性配置文件
3、編寫配置文件/etc/raidtab
可以從raidtools中的示範配置文件裏複製後，再做修改處理
4、創建Raid設備
實例如下：
[root@localhost root]# fdisk -l
Disk /dev/sda: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 652 5237158+ 83 Linux
Disk /dev/sdb: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
Disk /dev/sdc: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[root@localhost root]# fdisk /dev/sdb
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-522, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-522, default 522):
Using default value 522
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost root]# fdisk /dev/sdc
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-522, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-522, default 522):
Using default value 522
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost root]# fdisk -l
Disk /dev/sda: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 652 5237158+ 83 Linux
Disk /dev/sdb: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 522 4192933+ 83 Linux
Disk /dev/sdc: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 522 4192933+ 83 Linux
[root@localhost root]# rpm -q raidtools
raidtools-1.00.3-2
[root@localhost root]# rpm -ql raidtools
/sbin/arytst
/sbin/detect_multipath
/sbin/lsraid
/sbin/mkraid
/sbin/raid0run
/sbin/raidhotadd
/sbin/raidhotremove
/sbin/raidreconf
/sbin/raidsetfaulty
/sbin/raidstart
/sbin/raidstop
/usr/share/doc/raidtools-1.00.3
/usr/share/doc/raidtools-1.00.3/COPYING
/usr/share/doc/raidtools-1.00.3/README
/usr/share/doc/raidtools-1.00.3/multipath.conf.sample
/usr/share/doc/raidtools-1.00.3/raid0.conf.sample
/usr/share/doc/raidtools-1.00.3/raid1.conf.sample
/usr/share/doc/raidtools-1.00.3/raid4.conf.sample
/usr/share/doc/raidtools-1.00.3/raid5.conf.sample
/usr/share/doc/raidtools-1.00.3/raidtab.sample
/usr/share/man
/usr/share/man/man5
/usr/share/man/man5/raidtab.5.gz
/usr/share/man/man8
/usr/share/man/man8/ckraid.8.gz
/usr/share/man/man8/lsraid.8.gz
/usr/share/man/man8/mkraid.8.gz
/usr/share/man/man8/raid0run.8.gz
/usr/share/man/man8/raidadd.8.gz
/usr/share/man/man8/raidreconf.8.gz
/usr/share/man/man8/raidrun.8.gz
/usr/share/man/man8/raidstart.8.gz
/usr/share/man/man8/raidstop.8.gz
[root@localhost root]# cp /usr/share/doc/raidtools-1.00.3/raid0.conf.sample /etc/raidtab
[root@localhost root]# vi /etc/raidtab
# Sample raid-0 configuration
raiddev /dev/md0
raid-level 0 # it’s not obvious but this *must* be
# right after raiddev
persistent-superblock 0 # set this to 1 if you want autostart,
# BUT SETTING TO 1 WILL DESTROY PREVIOUS
# CONTENTS if this is a RAID0 array created
# by older raidtools (0.40-0.51) or mdtools!
chunk-size 16
nr-raid-disks 2
nr-spare-disks 0
device /dev/hda1 <———修改此項爲/dev/sdb1
raid-disk 0
device /dev/hdb1 <———修改此項爲/dev/sdc1
raid-disk 1
[root@localhost root]# cat /etc/raidtab
# Sample raid-0 configuration
raiddev /dev/md0 <—–確認這一項
raid-level 0 # it’s not obvious but this *must* be
# right after raiddev
persistent-superblock 0 # set this to 1 if you want autostart,
# BUT SETTING TO 1 WILL DESTROY PREVIOUS
# CONTENTS if this is a RAID0 array created
# by older raidtools (0.40-0.51) or mdtools!
chunk-size 16
nr-raid-disks 2
nr-spare-disks 0
device /dev/sdb1 <—–確認這一項
raid-disk 0
device /dev/sdc1 <—–確認這一項
raid-disk 1
[root@localhost root]# mkraid /dev/md0
handling MD device /dev/md0
analyzing super-block
[root@localhost root]# mkfs.ext3 /dev/md0
mke2fs 1.32 (09-Nov-2002)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
1048576 inodes, 2096464 blocks
104823 blocks (5.00%) reserved for the super user
First data block=0
64 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 21 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@localhost root]# mount /dev/md0 /opt
[root@localhost root]# mount
/dev/sda1 on / type ext3 (rw)
none on /proc type proc (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
none on /dev/shm type tmpfs (rw)
/dev/md0 on /opt type ext3 (rw)
如果想始終使用raid 0 的話,那就做如下的操作:
[root@localhost root]# mkdir /mnt/raid0
[root@localhost root]# vi /etc/fstab
LABEL=/ / ext3 defaults 1 1
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0
/dev/sdb5 /mnt/sdb5 ext3 defaults 0 0
/dev/md0 /mnt/raid0 ext3 defaults 0 0 <———–增加此行記錄
如不想使用的話,可以先卸載raid目錄,然後停止raid,最後刪除/etc/raidtab文件,操作如下:
[root@localhost root]# mkdir /mnt/raid0
[root@localhost root]# umount /dev/md0
[root@localhost root]# raidstop /dev/md0
[root@localhost root]# rm /etc/raidtab
rm: remove regular file `/etc/raidtab’? y
完成所有的配置任務.