[TOC] 1、执行fdisk /dev/vda命令对磁盘剩余空间进行分区；当遇到Command (m for help):时输入n，表示新建分区；然后当需要输入时，直接按Enter键；当再次遇到Command (m for help):时输入w，表示写入保存。 ``` [root@host-192-168-60-16 ~]# fdisk /dev/vda Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Command (m for help): n Partition type: p primary (2 primary, 0 extended, 2 free) e extended Select (default p): Using default response p Partition number (3,4, default 3): First sector (20971520-104857599, default 20971520): Using default value 20971520 Last sector, +sectors or +size{K,M,G} (20971520-104857599, default 104857599): Using default value 104857599 Partition 3 of type Linux and of size 40 GiB is set Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks. ``` 2、执行以下命令更新磁盘分区表 ``` [root@host-192-168-60-16 ~]# partprobe ``` 3、查看刚刚新建的分区，发现名字为vda3，大小为40G ``` [root@host-192-168-60-16 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 458K 0 rom vda 252:0 0 50G 0 disk ├─vda1 252:1 0 1G 0 part /boot ├─vda2 252:2 0 9G 0 part │ ├─centos-root 253:0 0 8G 0 lvm / │ └─centos-swap 253:1 0 1G 0 lvm [SWAP] └─vda3 252:3 0 40G 0 part ``` 4、使用vda3分区创建一个pv ``` [root@host-192-168-60-16 ~]# pvcreate /dev/vda3 ``` 5、把`/dev/vda3`这个pv加入到centos这个vg中，此时vg的空间会增加40G ``` [root@host-192-168-60-16 ~]# vgextend centos /dev/vda3 ``` 6、查看centos这个vg的大小，发现为48.99G ``` [root@host-192-168-60-16 ~]# vgdisplay --- Volume group --- VG Name centos 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 48.99 GiB PE Size 4.00 MiB Total PE 12542 Alloc PE / Size 2303 / <9.00 GiB Free PE / Size 10239 / <40.00 GiB VG UUID JuOM4n-bUuZ-eSbn-33eU-Q01c-aXcC-8CMiMD ``` 7、扩展`/dev/centos/root` 在第6步中我们看到centos这个vg的总大小为48.99GiB，Free PE为10239 ，Free Size小于40.00GiB。我们把所有Free PE都加到`/dev/centos/root`这个lv下 ``` [root@host-192-168-60-16 ~]# lvextend -l +10239 /dev/centos/root ``` 注意：如果只是想把`/dev/centos/root`扩展到指定大小，比如40G，那么可以执行如下命令： ``` $ lvextend -L 40G /dev/centos/root ``` 8、执行以下命令使根目录生效 ``` [root@host-192-168-60-16 ~]# xfs_growfs / ``` 9、查看根目录大小 ``` [root@host-192-168-60-16 ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/centos-root xfs 47G 1.3G 46G 3% / devtmpfs devtmpfs 3.9G 0 3.9G 0% /dev tmpfs tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs tmpfs 3.9G 8.6M 3.9G 1% /run tmpfs tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/vda1 xfs 1014M 148M 867M 15% /boot tmpfs tmpfs 783M 0 783M 0% /run/user/0 ``` ### **Reference** * http://man.linuxde.net/lvextend