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_linuxidcmkfs.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/u01ext4 defaults 1 1/dev/mapper/vg_linuxidc-lv_data/dataext4 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 10Gresize2fs 1.41.12 (17-May-)Please run 'e2fsck -f /dev/mapper/vg_linuxidc-lv_u01' first.[root@LINUXIDC-DB ~]# e2fsck -f /dev/mapper/vg_linuxidc-lv_u01e2fsck 1.41.12 (17-May-)Pass 1: Checking inodes, blocks, and sizesPass 2: Checking directory structurePass 3: Checking directory connectivityPass 4: Checking reference countsPass 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 10Gresize2fs 1.41.12 (17-May-)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_u01WARNING: Reducing active logical volume to 10.00 GiBTHIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce lv_u01? [y/n]: ySize 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 -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_linuxidc-lv_root15G 1.8G 13G 13% /tmpfs 499M0 499M 0% /dev/shm/dev/sda1 190M 36M 145M 20% /boot/dev/mapper/vg_linuxidc-lv_data9.8G 23M 9.2G 1% /data/dev/mapper/vg_linuxidc-lv_u019.8G 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