1.首先在硬盘上分3个区 （/dev/sda10,/dev/sda11,/dev/sda12），并且设置分区类型为raid code。
[root@airwayORA ~]# fdisk /dev/sda
The number of cylinders for this disk is set to 18630.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): n ---创建新的分区
First cylinder (6475-18630, default 6475):
Using default value 6475
Last cylinder or +size or +sizeM or +sizeK (6475-18630, default 18630): +200M
Command (m for help): m ---看帮助提示
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): l ----列出所有支持分区类型的code
0 Empty 1e Hidden W95 FAT1 80 Old Minix bf Solaris
1 FAT12 24 NEC DOS 81 Minix / old Lin c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 82 Linux swap / So c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 83 Linux c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 84 OS/2 hidden C: c7 Syrinx
5 Extended 41 PPC PReP Boot 85 Linux extended da Non-FS data
6 FAT16 42 SFS 86 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS 4d QNX4.x 87 NTFS volume set de Dell Utility
8 AIX 4e QNX4.x 2nd part 88 Linux plaintext df BootIt
9 AIX bootable 4f QNX4.x 3rd part 8e Linux LVM e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 93 Amoeba e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 94 Amoeba BBT e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M 9f BSD/OS eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi ee EFI GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a5 FreeBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a6 OpenBSD f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a7 NeXTSTEP f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a8 Darwin UFS f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor a9 NetBSD f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys ab Darwin boot fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
Command (m for help): t ----- change a partition's system id
Partition number (1-10): fd
Partition number (1-10): 10
Hex code (type L to list codes): fd
Changed system type of partition 10 to fd (Linux raid autodetect)
Command (m for help): n
First cylinder (6500-18630, default 6500):
Using default value 6500
Last cylinder or +size or +sizeM or +sizeK (6500-18630, default 18630): +200M
Command (m for help): t
Partition number (1-11): 11
Hex code (type L to list codes): l
0 Empty 1e Hidden W95 FAT1 80 Old Minix bf Solaris
1 FAT12 24 NEC DOS 81 Minix / old Lin c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 82 Linux swap / So c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 83 Linux c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 84 OS/2 hidden C: c7 Syrinx
5 Extended 41 PPC PReP Boot 85 Linux extended da Non-FS data
6 FAT16 42 SFS 86 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS 4d QNX4.x 87 NTFS volume set de Dell Utility
8 AIX 4e QNX4.x 2nd part 88 Linux plaintext df BootIt
9 AIX bootable 4f QNX4.x 3rd part 8e Linux LVM e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 93 Amoeba e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 94 Amoeba BBT e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M 9f BSD/OS eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi ee EFI GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a5 FreeBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a6 OpenBSD f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a7 NeXTSTEP f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a8 Darwin UFS f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor a9 NetBSD f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys ab Darwin boot fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
Hex code (type L to list codes): fd
Changed system type of partition 11 to fd (Linux raid autodetect)
Command (m for help): n
First cylinder (6525-18630, default 6525):
Using default value 6525
Last cylinder or +size or +sizeM or +sizeK (6525-18630, default 18630): +200M
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): t
Partition number (1-12): 12
Hex code (type L to list codes): fd
Changed system type of partition 12 to fd (Linux raid autodetect)
Command (m for help): w ---- write table to disk and exit（不写w，以上操作全部白费）
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[root@airwayORA ~]# partprobe --inform the OS of partition table changes（通知系统分区表变化）
2.在/dev目录下创建md1目录（系统默认从md0开始，我先前已经创建一个raid），
[root@airwayORA ~]# mdadm -C /dev/md1 -a yes -l 5 -n 3 /dev/sda{10,11,12}
mdadm: /dev/sda10 appears to contain an ext2fs file system
size=200780K mtime=Thu Jan 1 08:00:00 1970
mdadm: /dev/sda11 appears to contain an ext2fs file system
size=200780K mtime=Thu Jan 1 08:00:00 1970
mdadm: /dev/sda12 appears to contain an ext2fs file system
size=200780K mtime=Thu Jan 1 08:00:00 1970
Continue creating array?
Continue creating array? (y/n) y
mdadm: array /dev/md1 started.
注：
C：大些C代表创建一个raid
a：代表auto-detect（自动检测raid）；yes参数代表开始raid检测功能。
l：代表创建的raid的等级（0，1，5，6等）
n：代表使用几块分区
如果挂载成功，使用如下命令查看：
maadm --detail /dev/md1
[root@airwayORA /]# mdadm --detail /dev/md1
/dev/md1:
Version : 00.90.03
Creation Time : Thu Mar 26 18:42:05 2009
Raid Level : raid5
Array Size : 401408 (392.07 MiB 411.04 MB)
Used Dev Size : 200704 (196.03 MiB 205.52 MB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Thu Mar 26 18:47:10 2009
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : ec5f238a:88312bae:5866b501:c223eaa3
Events : 0.2
Number Major Minor RaidDevice State
0 8 10 0 active sync /dev/sda10
1 8 11 1 active sync /dev/sda11
2 8 12 2 active sync /dev/sda12
有如上信息代表raid5创建成功。
3.格式化分区为ext3格式
mkfs.ext3 -j /dev/md1
j:代表日志功能
4。挂载/dev/md1 到 /raidtest目录下：
[root@airwayORA /]# mount /dev/md1 /raidtest/
[root@airwayORA /]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 40631988 2589924 35944780 7% /
/dev/sda5 2030736 35928 1889988 2% /home
/dev/sda3 4061572 73792 3778132 2% /var/ftp/pub
/dev/mapper/vg01-lv01
983960 17652 915520 2% /data
/dev/sda1 101086 11248 84619 12% /boot
tmpfs 1005200 0 1005200 0% /dev/shm
/dev/md1 388741 2062 366609 1% /raidtest
代表挂载成功。
后记：
上面的方式，当系统重启后，/dev/md1 就不能自动挂载到/raidtest 目录。要开机自动挂载上去需要设置文件/etc/fstab文件。
/dev/md1 /raidtest ext3 defaults 0 0
注意分区格式是ext3，格式化命令为mkfs.ext3
ext2，格式化命令为mkfs.ext2
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