参考:https://www.jb51.net/article/144291.htm
https://blog.csdn.net/weixin_43139644/article/details/89948983
1. 查看磁盘空间大小,使用df -h 命令
文件系统 容量 已用 可用 已用% 挂载点 devtmpfs 1.4G 0 1.4G 0% /dev tmpfs 1.4G 0 1.4G 0% /dev/shm tmpfs 1.4G 11M 1.4G 1% /run tmpfs 1.4G 0 1.4G 0% /sys/fs/cgroup /dev/mapper/centos-root 7.0G 4.7G 2.4G 67% / /dev/sda1 1014M 185M 830M 19% /boot tmpfs 283M 20K 283M 1% /run/user/1000 /dev/sr0 4.5G 4.5G 0 100% /run/media/zhujiachun/CentOS 7 x86_64
2. 增加磁盘空间,例如下图使用VM虚拟机增加的方式。
3.使用fdisk -l命令查看磁盘信息。当看到第一行Disk /dev/vda: 161.1 GB与实际df -h显示内容不符时,说明增加磁盘成功了。
root@ubuntu14:/opt# fdisk -l Disk /dev/vda: 161.1 GB, 161061273600 bytes 16 heads, 63 sectors/track, 312076 cylinders, total 314572800 sectors Units = 扇区 of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0001a023 设备 启动 起点 终点 块数 Id 系统 /dev/vda1 * 2048 499711 248832 83 Linux /dev/vda2 501758 62912511 31205377 5 扩展 /dev/vda5 501760 62912511 31205376 8e Linux LVM Disk /dev/mapper/ubuntu14--vg-root: 29.8 GB, 29804724224 bytes 255 heads, 63 sectors/track, 3623 cylinders, total 58212352 sectors Units = 扇区 of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ubuntu14--vg-root doesn't contain a valid partition table Disk /dev/mapper/ubuntu14--vg-swap_1: 2147 MB, 2147483648 bytes 255 heads, 63 sectors/track, 261 cylinders, total 4194304 sectors Units = 扇区 of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ubuntu14--vg-swap_1 doesn't contain a valid partition table
4.使用fdisk /dev/sda, 创建新分区。
注意:不同操作系统的磁盘命名方式不同,有些是/dev/sda。具体使用方式参考第三步中fdisk -l首行显示Disk。如笔者在该系统中首行显示为Disk /dev/vda: 161.1 GB, 161061273600 bytes ,故使用命令fdisk /dev/vda)
按照下面Linux操作进行分区。
root@ubuntu14:/opt# fdisk /dev/vda 命令(输入 m 获取帮助): m 命令操作 a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) 命令(输入 m 获取帮助): n #new 新分区 Partition type: p primary (1 primary, 1 extended, 2 free) l logical (numbered from 5) Select (default p): p #选择主分区 分区号 (1-4,默认为 3): 3 #分区序号 起始 sector (499712-314572799,默认为 499712): #分区开始回车默认 将使用默认值 499712 Last sector, +扇区 or +size{K,M,G} (499712-501757,默认为 501757): 将使用默认值 501757 命令(输入 m 获取帮助): t #修改分区格式 分区号 (1-5): 4 #修改分区号 Hex code (type L to list codes): 8e #格式选择8e linux LVM Changed system type of partition 4 to 8e (Linux LVM) 命令(输入 m 获取帮助): p #显示分区信息 Disk /dev/vda: 161.1 GB, 161061273600 bytes 16 heads, 63 sectors/track, 312076 cylinders, total 314572800 sectors Units = 扇区 of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0001a023 设备 启动 起点 终点 块数 Id 系统 /dev/vda1 * 2048 499711 248832 83 Linux /dev/vda2 501758 62912511 31205377 5 扩展 /dev/vda3 499712 501757 1023 83 Linux /dev/vda4 62912512 314572799 125830144 8e Linux LVM /dev/vda5 501760 62912511 31205376 8e Linux LVM Partition table entries are not in disk order 命令(输入 m 获取帮助): w #保存信息 The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: 设备或资源忙. 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.
5. 重启Linux操作系统,使用reboot命令。
6. 创建物理卷,使用pvcreate /dev/sda3命令。
root@ubuntu14:~# pvcreate /dev/sda3
Physical volume "/dev/vda4" successfully created
7.查看新建的物理卷和大小,使用pvdisplay命令。
root@ubuntu14:~# pvdisplay
--- Physical volume ---
PV Name ubuntu14-vg
PV Size 29.76 GiB / not usable 2.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 7618
Free PE 0
Allocated PE 7618
PV UUID XR32TY-aRQC-IQC6-oCx7-aa9X-KdJe-bHmaBd
"/dev/vda4" /dev/vda5
VG Name is a new physical volume of "120.00 GiB"
--- NEW Physical volume ---
PV Name /dev/vda4
VG Name
PV Size 120.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID MVK0IT-LDgP-eWwZ-fzQM-tdyY-kRQ-nbk122
8. 将添加新的物理卷,加载到centos卷组,使用vgextend centos /dev/sda3命令。
vgextend centos /dev/sdb1
9. 逻辑卷扩容
lvextend -l +511 /dev/mapper/centos-root
10.接下来扩容文件系统
注意:如果文件系统是xfs格式用 xfs_growfs ,ext4格式用resize2fs
xfs_growfs /dev/mapper/centos-root
11.df -h 查看结果
扩容完成!