linux下的LVM实验

时间：2009-07-07 来源：unixthisyear

linux下的LVM实验
环境：vmware + rhel5.3
1. 添加5块硬盘
   #fdisk -l | grep dev //能看到5块新的硬盘
    Disk /dev/sdb: 2147 MB, 2147483648 bytes
    Disk /dev/sdc: 2147 MB, 2147483648 bytes
    Disk /dev/sdd: 2147 MB, 2147483648 bytes
    Disk /dev/sde: 2147 MB, 2147483648 bytes
    Disk /dev/sdf: 2147 MB, 2147483648 bytes
2. 格式化5块硬盘，把分区的system id设成8e
   # fdisk /dev/sdb1
     n -> p -> 1
     t -> 8e
     w
3. 创建PV
   # pvcreate /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
4. 查看PV
   # pvdisplay
5. 创建VG(gmmvg：包含/dev/sdb1 /dev/sdc1 /dev/sdd1)
   # vgcreate gmmvg /dev/sdb1 /dev/sdc1 /dev/sdd1
6. 查看VG
   # vgdisplay
7. 创建LV
   # lvcreate -L 1G -n gmmlv01 gmmvg
8. 创建文件系统
   # mkfs.ext3 /dev/gmmvg/gmmlv01
9. 挂载
   # mkdir /gmmdir01
   # mount /dev/mount /dev/gmmvg/gmmlv01 /gmmdir01
   # df -h
   /dev/mapper/gmmvg-gmmlv01 1008M   34M 924M   4% /gmmdir01
   问：为什么是mapper？mapper是什么？