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<br>
这里md表示创建的是RAID磁盘类型。结果如下所示：<br>
<br>
[root@localhost root]# mkraid  /dev/md0<br>
handling MD device /dev/md0<br>
analyzing super-block<br>
disk 0: /dev/hda9, 105808kB, raid superblock at 105728kB<br>
disk 1: /dev/hda10, 105808kB, raid superblock at 105728kB<br>
disk 2: /dev/hda11, 105808kB, raid superblock at 105728kB<br>
disk 3: /dev/hda12, 105808kB, raid superblock at 105728kB<br>
md0: WARNING: hda10 appears to be on the same physical disk as hda9. True<br>
     protection against single-disk failure might be compromised.<br>
md0: WARNING: hda11 appears to be on the same physical disk as hda10. True<br>
     protection against single-disk failure might be compromised.<br>
md0: WARNING: hda12 appears to be on the same physical disk as hda11. True<br>
     protection against single-disk failure might be compromised.<br>
md: md0: RAID array is not clean -- starting background reconstruction<br>
   8regs     :  2206.800 MB/sec<br>
   32regs    :  1025.200 MB/sec<br>
   pII_mmx   :  2658.400 MB/sec<br>
   p5_mmx    :  2818.400 MB/sec<br>
raid5: using function: p5_mmx (2818.400 MB/sec)<br>
raid5: raid level 5 set md0 active with 3 out of 3 devices, algorithm 2<br>
<br>
<br>
<br>
7.使用 lsraid -a /dev/md0 查看RAID分区状况<br>
<br>
结果如下所示：<br>
<br>
[root@localhost root]# lsraid -a  /dev/md0<br>
[dev   9,   0] /dev/md0   86391738.19BEDD09.8F02C37B.51584DBA online<br>
[dev   3,   9] /dev/hda9  86391738.19BEDD09.8F02C37B.51584DBA good<br>
[dev   3,  10] /dev/hda10 86391738.19BEDD09.8F02C37B.51584DBA good<br>
[dev   3,  11] /dev/hda11 86391738.19BEDD09.8F02C37B.51584DBA good<br>
[dev   3,  12] /dev/hda12 86391738.19BEDD09.8F02C37B.51584DBA spare<br>
<br>
<br>
<br>
8.mkfs.ext3/dev/md0将RAID分区格式化为ext3格式<br>
<br>
结果如下所示：<br>
<br>
[root@localhost root]# mkfs.ext3 /dev/md0<br>
mke2fs 1.27 (8-Mar-2002)<br>
Filesystem label=<br>
OS type: Linux<br>
Block size=1024 (log=0)<br>
Fragment size=1024 (log=0)<br>
53040 inodes, 211456 blocks<br>
10572 blocks (5.00%) reserved for the super user<br>
First data block=1<br>
26 block groups<br>
8192 blocks per group, 8192 fragments per group<br>
2040 inodes per group<br>
Superblock backups stored on blocks:<br>
        8193, 24577, 40961, 57345, 73729, 204801<br>
<br>
raid5: switching cache buffer size, 4096 --&gt; 1024<br>
Writing inode tables: done<br>
Creating journal (4096 blocks): done<br>
Writing superblocks and filesystem accounting information:<br>
done<br>
<br>
This filesystem will be automatically checked every 22 mounts or<br>
180 days, whichever comes first.  Use tune2fs -c or -i to override.<br>
<br>
<br>
<br>
9.mount /dev/md0 /mnt/md0<br>
<br>
这里应首先在mnt目录下创建md0子目录。<br>
<br>
至此，所有创建工作完成，md0目录就成为具有RAID作用的一个目录。<br>
<br>
检验RAID的效果<br>
<br>
我们可以使用以下步骤检验RAID的效果。<br>
<br>
1.dd if=/dev/zero of=/dev/hda9 bs=100000000 count=10<br>
<br>
将RAID的第一个磁盘分区hda9全部置0；bs表示一次写多少位，count表示写多少次。这里一定要使写入的数据大于磁盘分区的容量，否则由于RAID的作用，数据会自动恢复原有值。如下所示：<br>
<br>
[root@localhost root]<br>
# dd if=/dev/zero of=/dev/hda9 bs=100000000 count=10<br>
dd: writing `/dev/hda9': No space left on device<br>
2+0 records in<br>
1+0 records out<br>
<br>
<br>
<br>
2.用lsraid -a /dev/md0查看到/dev/hda9数据全为0<br>
<br>
如下所示：<br>
<br>
[root@localhost root]# lsraid -a /dev/md0<br>
lsraid: Device "/dev/hda9" does not have a valid raid superblock<br>
lsraid: Device "/dev/hda9" does not have a valid raid superblock<br>
lsraid: Device "/dev/hda9" does not have a valid raid superblock<br>
lsraid: Device "/dev/hda9" does not have a valid raid superblock<br>
[dev   9,   0] /dev/md0   86391738.19BEDD09.8F02C37B.51584DBA online<br>
[dev   ?,   ?] (unknown)  00000000.00000000.00000000.00000000 missing<br>
[dev   3,  10] /dev/hda10 86391738.19BEDD09.8F02C37B.51584DBA good<br>
[dev   3,  11] /dev/hda11 86391738.19BEDD09.8F02C37B.51584DBA good<br>
[dev   3,  12] /dev/hda12 86391738.19BEDD09.8F02C37B.51584DBA spare<br>
<br>
<br>
<br>
3.raidstop /dev/md0<br>
<br>
4.raidstart /dev/md0<br>
<br>
则/dev/hda9的数据恢复正常，说明RAID的数据校验功能已起作用。<br>
<br>
在使用Linux的过程中，可以随时创建RAID来提高数据的可靠性和I/O性能，甚至可以将多个硬盘剩余的较小空间组合成一个较大空间。<br>
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