简介

CentOS7虚拟机原硬盘空间只分配了10GB，需要扩容到20GB。

环境：VMware 10

VMware分配空间

选中虚拟机->虚拟机设置->硬盘->实用工具->扩展->设置最大磁盘大小->点击扩展

这里写图片描述

CentOS7内部分配

可以参考：

查看当前磁盘空间，/dev/mapper/cl-root硬盘空间只有8GB，打算扩容：

df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/cl-root 8.0G 3.8G 4.3G 47% /devtmpfs 482M 0 482M 0% /devtmpfs 493M 0 493M 0% /dev/shmtmpfs 493M 6.7M 486M 2% /runtmpfs 493M 0 493M 0% /sys/fs/cgroup/dev/sda1 1014M 184M 831M 19% /boottmpfs 99M 0 99M 0% /run/user/012345678910对新增的硬盘空间做新增分区（硬盘数没有增加，增加的是空间）

fdisk /dev/sda

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 extendedSelect (default p): pPartition number (3,4, default 3): 3First sector (20971520-41943039, default 20971520): Using default value 20971520Last sector, +sectors or +size{K,M,G} (20971520-41943039, default 41943039): Using default value 41943039Partition 3 of type Linux and of size 10 GiB is set

Command (m for help): t

Partition number (1-3, default 3): 3Hex code (type L to list all codes): 8eChanged type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors

Units = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000bc924

Device Boot Start End Blocks Id System

/dev/sda1 * 2048 2099199 1048576 83 Linux/dev/sda2 2099200 20971519 9436160 8e Linux LVM/dev/sda3 20971520 41943039 10485760 8e Linux LVM

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 atthe next reboot or after you run partprobe(8) or kpartx(8)Syncing disks.123456789101112131415161718192021222324252627282930313233343536373839404142434445464748重启系统 reboot查看当前分区类型，本例类型为xfs

df -T /dev/sda1

Filesystem Type 1K-blocks Used Available Use% Mounted on

/dev/sda1 xfs 1038336 188240 850096 19% /boot123在新磁盘上创建xfs文件系统

mkfs.xfs /dev/sda3

meta-data=/dev/sda3 isize=512 agcount=4, agsize=655360 blks

= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=0, sparse=0data = bsize=4096 blocks=2621440, imaxpct=25= sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=1log =internal log bsize=4096 blocks=2560, version=2= sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=01234567891011创建PV

pvcreate /dev/sda3

WARNING: xfs signature detected on /dev/sda3 at offset 0. Wipe it? [y/n]: y

Wiping xfs signature on /dev/sda3.Physical volume "/dev/sda3" successfully created.

pvdisplay

--- Physical volume ---

PV Name /dev/sda2VG Name clPV Size 9.00 GiB / not usable 3.00 MiBAllocatable yes (but full)PE Size 4.00 MiBTotal PE 2303Free PE 0Allocated PE 2303PV UUID MlRwjY-TmVF-H8PV-heSz-ALGL-Q7sp-jFU6Al

"/dev/sda3" is a new physical volume of "10.00 GiB"

--- NEW Physical volume ---PV Name /dev/sda3VG Name PV Size 10.00 GiBAllocatable NOPE Size 0 Total PE 0Free PE 0Allocated PE 0PV UUID 0hmgH0-0wVg-jWUW-65WX-1TYb-sUGH-6jF1qm12345678910111213141516171819202122232425262728PV加入VG，vgextend后接VG Name，本例中为cl

vgdisplay

--- Volume group ---

VG Name clSystem ID Format lvm2Metadata Areas 1Metadata Sequence No 3VG Access read/writeVG Status resizableMAX LV 0Cur LV 2Open LV 2Max PV 0Cur PV 1Act PV 1VG Size 9.00 GiBPE Size 4.00 MiBTotal PE 2303Alloc PE / Size 2303 / 9.00 GiBFree PE / Size 0 / 0 VG UUID dYdb4l-wMUh-e2xv-WiaJ-Oa52-NvdF-s5ICJC

vgextend cl /dev/sda3

1

23456789101112131415161718192021222324VG加入LV

lvextend -l +2559 /dev/cl/root

Size of logical volume cl/root changed from 8.00 GiB (2047 extents) to 17.99 GiB (4606 extents).

Logical volume cl/root successfully resized.1234后两个参数“+2559”和“/dev/cl/root”来源详解： “+2559”来自于vgdisplay命令的Free PE/Size字段

vgdisplay

--- Volume group ---

VG Name cl...VG Size 18.99 GiBPE Size 4.00 MiBTotal PE 4862Alloc PE / Size 2303 / 9.00 GiBFree PE / Size 2559 / 10.00 GiBVG UUID dYdb4l-wMUh-e2xv-WiaJ-Oa52-NvdF-s5ICJC1234567891011“/dev/cl/root”来自于lvdisplay命令的LV Path字段。

lvdisplay

...

--- Logical volume ---LV Path /dev/cl/root...12345调整文件系统大小，本例中是xfs文件系统使用xfs_growfs命令调整，若其他文件系统，如ext4使用resize2fs命令，注意区分。

xfs_growfs /dev/cl/root

meta-data=/dev/mapper/cl-root isize=512 agcount=4, agsize=524032 blks

= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=0 spinodes=0data = bsize=4096 blocks=2096128, imaxpct=25= sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=1log =internal bsize=4096 blocks=2560, version=2= sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 2096128 to 4716544123456789101112结果

/dev/mapper/cl-root从8G增加到了18G

df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/cl-root 18G 3.8G 15G 21% /devtmpfs 482M 0 482M 0% /devtmpfs 493M 0 493M 0% /dev/shmtmpfs 493M 6.7M 486M 2% /runtmpfs 493M 0 493M 0% /sys/fs/cgroup/dev/sda1 1014M 184M 831M 19% /boottmpfs 99M 0 99M 0% /run/user/0