通过扩展Volume Group、Logical Volume来达到扩展文件系统的大小，
我的服务器是建在虚机上的， 分配硬盘空间时，通过修改参数把原来硬盘加大的。 [root@localhost ~]# fdisk -lDisk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 1044 8281507+ 8e Linux LVM先创建物理分区#fdisk /dev/sda 通n键，创建一个主分区；通t键，输入8e转换为LVM分区 w键，写入分区表 Disk /dev/sda: 32.2 GB, 32212254720 bytes 255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 1044 8281507+ 8e Linux LVM /dev/sda3 1045 3916 23069340 8e Linux LVM 重启生效，然后创建物理卷(physical volume) #pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created 查看现有的vg #vgdisplay --- Volume group --- VG Name VolGroup00 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 7.88 GB PE Size 32.00 MB Total PE 252 Alloc PE / Size 250 / 7.81 GB Free PE / Size 2 / 64.00 MB VG UUID Zv74Nv-kqbn-SpF3-yBcg-brXn-2X0G-5mbJcx通过vgextend命令扩展现有的vg #vgextend VolGroup00 /dev/sda3 Volume group "VolGroup00" successfully extended #vgdisplay --- Volume group --- VG Name VolGroup00 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 29.88 GB PE Size 32.00 MB Total PE 956 Alloc PE / Size 250 / 7.81 GB Free PE / Size 706 / 22.06 GB VG UUID Zv74Nv-kqbn-SpF3-yBcg-brXn-2X0G-5mbJcx #mount /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw) none on /proc type proc (rw) none on /sys type sysfs (rw) none on /dev/pts type devpts (rw,gid=5,mode=620) /dev/sda1 on /boot type ext3 (rw) none on /dev/shm type tmpfs (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)可以看到文件系统的 / 是挂载在/dev/mapper/VolGroup00-LogVol00上的，因此，通过改变lv LogVol00的大小来达到给/增减空间的目的。 # lvscan ACTIVE '/dev/VolGroup00/LogVol00' [5.88 GB] inherit ACTIVE '/dev/VolGroup00/LogVol01' [1.94 GB] inherit通过lvresize命令扩展Logical Volume # lvresize -L +22.06G /dev/VolGroup00/LogVol00 Rounding up size to full physical extent 22.06 GB Extending logical volume LogVol00 to 27.94 GB Logical volume LogVol00 successfully resized调整完后，查看一下文件系统使用情况#df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 5.8G 3.5G 2.1G 63% / /dev/sda1 99M 14M 81M 14% /boot none 506M 0 506M 0% /dev/shm发现并没有没发生改变 通过ext2online命令在线resize文件系统 #ext2online /dev/mapper/VolGroup00-LogVol00如果不能运行上面的命令可以运行下面的命令resize2fs /dev/VolGroup00/LogVol01 还要重新一下识别磁盘容量#df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 28G 3.5G 23G 14% / /dev/sda1 99M 14M 81M 14% /boot none 506M 0 506M 0% /dev/shm大小调整成功！ 检查分区#e2fsck /dev/VolGroup00/LogVol00