lvm及raid混搭是现今存储管理方式的主要解决方案。笔者参考网上一些贴子及查阅官方文档，初步先构建了raid1+lvm，实现了基本的功能。
    如有不熟悉lvm,可以参考如下链接文章:
lvm术语简介及操作指南
  
   概述：我的测试皆在vmware server 1.0.6,os采用centos 5.4

   开始构建，步骤大体如下：
1,采用mdadm配置raid1设备，如果大家对mdadm使用不熟悉，请参考这几篇文章:
http://space.itpub.net/9240380/viewspace-630880

http://space.itpub.net/9240380/viewspace-630895
[root@localhost dev]# !223
mdadm --create /dev/md8 -l1 -n2 /dev/sdd1 /dev/sdb1
mdadm: /dev/sdd1 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Sat Feb 14 10:36:43 2015
mdadm: /dev/sdb1 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Sat Feb 14 10:36:43 2015
Continue creating array? yes
mdadm: array /dev/md8 started.
[root@localhost dev]# mdadm --detail --scan   ---此命令扫描下以上构建的raid设备的相关配置信息
ARRAY /dev/md8 level=raid1 num-devices=2 metadata=0.90 UUID=8a87573f:f0802515:f9d540fc:c4782e7c



  [root@localhost ~]# vgremove vg01  --运行这个是因为以前在os上配置过vg了，所以先要删除以前的vg配置
  /dev/cdrom: open failed: Read-only file system
Do you really want to remove volume group "vg01" containing 1 logical volumes? [y/n]: y
Do you really want to remove active logical volume lv01? [y/n]: y
  Logical volume "lv01" successfully removed
  Volume group "vg01" successfully removed


2，利用lvm构建pv,vg,lv
[root@localhost ~]# pvcreate /dev/md8   ---
  /dev/cdrom: open failed: Read-only file system
  Attempt to close device '/dev/cdrom' which is not open.
  Physical volume "/dev/md8" successfully created
[root@localhost ~]# vgcreate vg1 /dev/md8
  /dev/cdrom: open failed: Read-only file system
  Attempt to close device '/dev/cdrom' which is not open.
  Volume group "vg1" successfully created
[root@localhost ~]# lvcreate -L 2.5GB -n lv1 vg1
  Logical volume "lv1" created
[root@localhost ~]# lvscan
  ACTIVE            '/dev/vg1/lv1' [2.50 GB] inherit
[root@localhost ~]# pvscan
  /dev/cdrom: open failed: Read-only file system
  Attempt to close device '/dev/cdrom' which is not open.
  PV /dev/md8   VG vg1   lvm2 [2.99 GB / 504.00 MB free]
  Total: 1 [2.99 GB] / in use: 1 [2.99 GB] / in no VG: 0 [0   ]
[root@localhost ~]# vgscan
  Reading all physical volumes.  This may take a while...
  /dev/cdrom: open failed: Read-only file system
  Attempt to close device '/dev/cdrom' which is not open.
  Found volume group "vg1" using metadata type lvm2


3，运地mke2fs，配置对应的ext3文件系统（加j otion),并加载文件系统到cento5.4
[root@localhost ~]# mke2fs -j /dev/vg1/lv1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
327680 inodes, 655360 blocks
32768 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=671088640
20 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912

Writing inode tables: done                           
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 28 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@localhost ~]# mkdir -pv /lun
[root@localhost ~]# mount /dev/vg1/lv1  /lun
[root@localhost ~]# df -hk  --查看lvm分区的mount状况
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda2             17856888   6497720  10437444  39% /
tmpfs                   216476         0    216476   0% /dev/shm
none                    216388       104    216284   1% /var/lib/xenstored
/dev/hdc               3906842   3906842         0 100% /media/CentOS_5.4_Final
/dev/mapper/vg1-lv1    2580272     69448   2379752   3% /lun

4,为了下次重启自动挂载lvm的分区
[root@localhost ~]# vi /etc/fstab

LABEL=/                 /                       ext3    defaults        1 1
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=SWAP-hda1         swap                    swap    defaults        0 0

/dev/vg1/lv1            /lun                    ext3    defaults        2 2
~
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