LVM扩展空间步骤

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：

[root@localhost ~]# 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%     /boot  tmpfs                        125M   0      125M   0%      /dev/shm  /dev/mapper/rootvg-homelv    496M   19M    452M   4%      /home  

1、新建LVM类型分区：

[root@localhost ~]# 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 bytes  255 heads, 63 sectors/track, 1305 cylinders  Units = cylinders of 16065 * 512 = 8225280bytes      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PV

[root@localhost ~]# partprobe            \使用partprobe指令更新内核的中硬盘分区表信息  [root@localhost ~]# pvcreate /dev/sda6              \创建新的PV-----------lsblk查看硬盘，可以不执行第一步，直接建立PV   Physical volume "/dev/sda6" successfully created  [root@localhost ~]# 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 GB]  

3、将PV加入VG组

[root@localhost ~]# vgextend rootvg /dev/sda6   Volume group "rootvg" successfully extended    [root@localhost ~]# 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LV

[root@localhost ~]# lvextend -L +100M /dev/rootvg/homelv   Extending logical volume homelv to 612.00 MB   Logical volume homelv successfully resized  

5、使用resizefs2命令重新加载逻辑卷的大小才能生效

[root@localhost ~]# resize2fs /dev/rootvg/homelv  resize2fs 1.39 (29-May-2006)  Filesystem at /dev/rootvg/homelv is mountedon /home; on-line resizing required  Performing an on-line resize of/dev/rootvg/homelv to 626688 (1k) blocks.  The filesystem on /dev/rootvg/homelv is now626688 blocks long.  

查看增加空间后的/home空间

[root@localhost ~]# 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%     /boot  tmpfs                        125M   0      125M   0%      /dev/shm  /dev/mapper/rootvg-homelv    593M   19M    544M   4%      /home  

原文出处：51cto -> http://sf1314.blog.51cto.com/13295031/1972085