一、新建并挂载目录 /u01 和 /data 1.创建目录挂节点/u01,/data mkdir -p /{u01,data} 2.创建lv,名称是lv_u01,大小10g,从vg_linuxidc中划分空间,这里的vg_linuxidc是vg的名称。 lvcreate -L 10g -n lv_u01 vg_linuxidc 3.格式化为ext4文件系统 mkfs.ext4 /dev/mapper/vg_linuxidc-lv_u01 4.同样的,创建lv_data lvcreate -L 10g -n lv_data vg_linuxidc mkfs.ext4 /dev/mapper/vg_linuxidc-lv_data 5.在/etc/fstab中添加挂载信息,实现开机自动挂载 vi /etc/fstab/dev/mapper/vg_linuxidc-lv_u01 /u01 ext4 defaults 1 1/dev/mapper/vg_linuxidc-lv_data /data ext4 defaults 1 1 二、lv扩容: 第一种方法:直接增大5G,写“+5G” 1.lv扩容5G lvresize -L +5G /dev/mapper/vg_linuxidc-lv_root 2.文件系统大小变更 resize2fs /dev/mapper/vg_linuxidc-lv_root 第二种方法:原来是10G,增大5G就是“15G” 1.lv扩容到15G lvresize -L 15G /dev/mapper/vg_linuxidc-lv_u01 2.文件系统大小变更 resize2fs /dev/mapper/vg_linuxidc-lv_u01 注:以上的lvresize命令操作也可以通过lvextend命令实现。 三、lv缩减: 1.需要先卸载目录 umount /u01 2.这一步是否有根据执行下一步的执行返回决定,看下面的例子 e2fsck -f /dev/mapper/vg_linuxidc-lv_u01 3.文件系统大小变更 resize2fs /dev/mapper/vg_linuxidc-lv_u01 10G 4.lv缩减 lvresize -L 10G /dev/mapper/vg_linuxidc-lv_u01 5.挂载所有/etc/fstab中记录的目录 mount -a 附:lv缩减的一个实际操作过程: [root@LINUXIDC-DB ~]# umount /u01 [root@LINUXIDC-DB ~]# resize2fs /dev/mapper/vg_linuxidc-lv_u01 10G resize2fs 1.41.12 (17-May-2010) Please run 'e2fsck -f /dev/mapper/vg_linuxidc-lv_u01' first. [root@LINUXIDC-DB ~]# e2fsck -f /dev/mapper/vg_linuxidc-lv_u01 e2fsck 1.41.12 (17-May-2010) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/mapper/vg_linuxidc-lv_u01: 12/983040 files (0.0% non-contiguous), 100865/3932160 blocks [root@LINUXIDC-DB ~]# resize2fs /dev/mapper/vg_linuxidc-lv_u01 10G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/vg_linuxidc-lv_u01 to 2621440 (4k) blocks. The filesystem on /dev/mapper/vg_linuxidc-lv_u01 is now 2621440 blocks long. [root@LINUXIDC-DB ~]# lvresize -L 10G /dev/mapper/vg_linuxidc-lv_u01 WARNING: Reducing active logical volume to 10.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce lv_u01? [y/n]: y Size of logical volume vg_linuxidc/lv_u01 changed from 15.00 GiB (3840 extents) to 10.00 GiB (2560 extents). Logical volume lv_u01 successfully resized [root@LINUXIDC-DB ~]# mount -a [root@LINUXIDC-DB ~]# df -h Filesystem Size Used Avail Use% Mounted on/dev/mapper/vg_linuxidc-lv_root 15G 1.8G 13G 13% / tmpfs 499M 0 499M 0% /dev/shm /dev/sda1 190M 36M 145M 20% /boot /dev/mapper/vg_linuxidc-lv_data 9.8G 23M 9.2G 1% /data/dev/mapper/vg_linuxidc-lv_u01 9.8G 23M 9.2G 1% /u01 [root@LINUXIDC-DB ~]# 同样lvreduce命令也可以实现lv的缩减。 lvresize命令实际上是包含了lvextend和lvreduce的功能。 --LVM管理的swap扩展,比如增大1024M: [root@linuxidc-DB ~]# swapoff /dev/mapper/vg_linuxidc-lv_swap [root@linuxidc-DB ~]# lvextend -L +1024m /dev/mapper/vg_linuxidc-lv_swap [root@linuxidc-DB ~]# mkswap /dev/mapper/vg_linuxidc-lv_swap [root@linuxidc-DB ~]# swapon /dev/mapper/vg_linuxidc-lv_swap
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