LVM扩展空间步骤.doc

LVM扩展空间步骤撰写：李亮日期：2011-6-15当LV空间利用率较大即将耗尽LV空间时，我们可以将一块新的磁盘或者一块磁盘上的free空间加入LV，步骤如下：现在/home空间如下：rootlocalhost # df -h文件系统 容量 已用 可用 已用% 挂载点/dev/mapper/rootvg-rootlv 7.6G 2.0G 5.2G 28% /dev/sda1 99M 11M 83M 12% /boottmpfs 125M 0 125M 0% /dev/shm/dev/mapper/rootvg-homelv 496M 19M 452M 4% /home1、 新建LVM类型分区：rootlocalhost # fdisk /dev/sda对硬盘sda进行分区操作Command (m for help): n创建新的分区First cylinder (1160-1305, default 1160): 1160指定起始柱面Last cylinder or +size or +sizeM or +sizeK (1160-1305, default 1305): 1305指定终止柱面Command (m for help): p查看当前分区表信息Disk /dev/sda: 10.7 GB, 10737418240 bytes255 heads, 63 sectors/track, 1305 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System/dev/sda1 * 1 13 104391 83 Linux/dev/sda2 14 395 3068415 8e Linux LVM/dev/sda3 396 777 3068415 8e Linux LVM/dev/sda4 778 1305 4241160 5 Extended/dev/sda5 778 1159 3068383+ 8e Linux LVM/dev/sda6 1160 1305 1172713+ 83 Linux 刚刚新建的分区Command (m for help): t改变分区类型Partition number (1-6): 6指定分区编号Hex code (type L to list codes): 8e更改为LVM类型分区Changed system type of partition 6 to 8e (Linux LVM)Command (m for help): w保存退出The partition table has been altered!2、创建新的PVrootlocalhost # partprobe 使用partprobe指令更新内核的中硬盘分区表信息rootlocalhost # pvcreate /dev/sda6创建新的PV Physical volume /dev/sda6 successfully createdrootlocalhost # pvscan PV /dev/sda2 VG rootvg lvm2 2.93 GB / 0 free PV /dev/sda3 VG rootvg lvm2 2.93 GB / 0 free PV /dev/sda5 VG rootvg lvm2 2.93 GB / 0 free PV /dev/sda6 lvm2 1.12 GB新创建的PV但是尚未加入任何VG组 Total: 4 9.90 GB / in use: 3 8.78 GB / in no VG: 1 1.12 GB3、 将PV加入VG组rootlocalhost # vgextend rootvg /dev/sda6 Volume group rootvg successfully extendedrootlocalhost # pvscan PV /dev/sda2 VG rootvg lvm2 2.93 GB / 0 free PV /dev/sda3 VG rootvg lvm2 2.93 GB / 0 free PV /dev/sda5 VG rootvg lvm2 2.93 GB / 0 free PV /dev/sda6 VG rootvg lvm2 1.12 GB / 1.12 GB free已经加入rootvg组 Total: 4 9.89 GB / in use: 4 9.89 GB / in no VG: 0 0 4、 将VG组中的空闲空间划出100M到/home分区所在的LVrootlocalhost # lvextend -L +100M /dev/rootvg/homelv Extending logical volume homelv to 612.00 MB Logical volume homelv successfully resized5、使用resizefs2命令重新加载逻辑卷的大小才能生效 rootlocalhost # resize2fs /dev/rootvg/homelv resize2fs 1.39 (29-May-2006)Filesystem at /dev/rootvg/homelv is mounted on /home; on-line resizing requiredPerforming an on-line resize of /dev/rootvg/homelv to 626688 (1k) blocks.The filesystem on /dev/rootvg/homelv is now 626688 blocks long.查看增加空间后的/home空间rootlocalhost # df -h文件系统 容量 已用 可用 已用% 挂载点/dev/mapper/rootvg-roo