大家好，又见面了，我是你们的朋友全栈君。
1.先在Vmware上，把虚拟机硬盘做扩展，如果有快照存在，磁盘可能是不可编辑状态，先删除快照后再扩展。
2.现在打开虚拟机发现系统的磁盘空间已经扩了，但是硬盘分区可用空间没变，还是原来的30G
[root@master home]# fdisk -l
Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e39fe
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
3、使用fdisk 新建分区，为lvm扩容做准备
[root@master ~]# 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): p
Disk /dev/sda: 66.6 GB, 66571993088 bytes, 130023424 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e39fe
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3): 3
First sector (125829120-130023423, default 125829120):
Using default value 125829120
Last sector, +sectors or +size{K,M,G} (125829120-130023423, default 130023423):
Using default value 130023423
Partition 3 of type Linux and of size 2 GiB is set
Command (m for help): p
Disk /dev/sda: 66.6 GB, 66571993088 bytes, 130023424 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e39fe
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
/dev/sda3 125829120 130023423 2097152 83 Linux
Command (m for help): t
Partition number (1-3, default 3): 3
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sda: 66.6 GB, 66571993088 bytes, 130023424 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e39fe
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
/dev/sda3 125829120 130023423 2097152 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 at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
使分区表生效，无需重启： partprobe
4、建立pv
[root@master ~]# pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created.[root@master ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name cl
PV Size <59.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 15103
Free PE 1
Allocated PE 15102
PV UUID FIyz9f-hb3s-EfyI-jvlU-w3WW-B00f-h1YADj
"/dev/sda3" is a new physical volume of "2.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sda3
VG Name
PV Size 2.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID otYU0U-Nti9-H9zz-D2h8-Gqys-f8wJ-Eqnkwd
5、扩展vg
[root@master ~]# vgextend cl /dev/sda3
Volume group "cl" successfully extended
[root@master ~]# vgdisplay
--- Volume group ---
VG Name cl
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size 60.99 GiB
PE Size 4.00 MiB
Total PE 15614
Alloc PE / Size 15102 / 58.99 GiB
Free PE / Size 512 / 2.00 GiB
VG UUID yjbhCl-sZnU-wNh1-usz3-WP99-CGVU-OOyWie
6、扩展lv
输入扩展单元，这里就是上面的Free Pe 的大小。
挂载到“/” 根目录下，将卷组下的卷cl 扩容2G。
[root@master ~]# lvextend -L +2G /dev/cl/home
Size of logical volume cl/home changed from <18.70 GiB (4786 extents) to <20.70 GiB (5298 extents).
Logical volume cl/home successfully resized.
[root@master ~]# lvdisplay
--- Logical volume ---
LV Path /dev/cl/swap
LV Name swap
VG Name cl
LV UUID Yz5pFL-TNrc-WQrG-Ow07-xN78-MljW-CQeIKQ
LV Write Access read/write
LV Creation host, time cent7-01, 2018-11-20 09:08:07 +0800
LV Status available
# open 2
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/cl/home
LV Name home
VG Name cl
LV UUID 12FQnu-Eav4-0W1k-329H-QGkA-t8tB-vanNr0
LV Write Access read/write
LV Creation host, time cent7-01, 2018-11-20 09:08:07 +0800
LV Status available
# open 1
LV Size <20.70 GiB
Current LE 5298
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID QtcPGX-XC5Y-QmU1-8lGc-yInH-Nxbn-hbR45h
LV Write Access read/write
LV Creation host, time cent7-01, 2018-11-20 09:08:07 +0800
LV Status available
# open 1
LV Size <38.30 GiB
Current LE 9804
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
这个命令一般是新加分区的时候用到的。lvcreate -L 100M -n lvdata Vo1Group00
创建了一个名字为lvData，容量大小是100M的分区，其中：-L：指定LV的大小 -n：指定LV的名。Vo1Group00：表示从这个VG中划分LV；
7、调整文件系统
使用 resize2fs时，提示错误
[root@master ~]# resize2fs /dev/cl/home
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/cl/home
Couldn't find valid filesystem superblock.
了解后发现，xfs格式的文件扩充需要使用 xfs_growfs
[root@master ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/cl-root xfs 39G 9.8G 29G 26% /
devtmpfs devtmpfs 475M 0 475M 0% /dev
tmpfs tmpfs 487M 0 487M 0% /dev/shm
tmpfs tmpfs 487M 7.6M 479M 2% /run
tmpfs tmpfs 487M 0 487M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 179M 836M 18% /boot
/dev/mapper/cl-home xfs 19G 2.8G 16G 15% /home
tmpfs tmpfs 98M 0 98M 0% /run/user/0
[root@master ~]# xfs_growfs /dev/mapper/cl-home
meta-data=/dev/mapper/cl-home isize=512 agcount=4, agsize=1225216 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=4900864, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 4900864 to 5425152
8、收工
[root@master ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 39G 9.8G 29G 26% /
devtmpfs 475M 0 475M 0% /dev
tmpfs 487M 0 487M 0% /dev/shm
tmpfs 487M 7.6M 479M 2% /run
tmpfs 487M 0 487M 0% /sys/fs/cgroup
/dev/sda1 1014M 179M 836M 18% /boot
/dev/mapper/cl-home 21G 2.8G 18G 14% /home
tmpfs 98M 0 98M 0% /run/user/0
参考文章：http://www.cnblogs.com/gaojun/archive/2012/08/22/2650229.html
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