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背景说明：
- 虚拟机之前是 50G 磁盘空间，做实验过程磁盘不够，在 vmware 图形中直接将磁盘从 50G 扩容成 100G。
- linux 采用磁盘 LVM 管理
命令行扩容命令记录如下：
[dave@cndba.cn ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000be31b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
Disk /dev/mapper/rhel-root: 47.2 GB, 47240445952 bytes, 92266496 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 /dev/mapper/rhel-swap: 5368 MB, 5368709120 bytes, 10485760 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
[dave@cndba.cn ~]# 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 extended
Select (default p): p
Partition number (3,4, default 3):
First sector (104857600-209715199, default 104857600):
Using default value 104857600
Last sector, +sectors or +size{K,M,G} (104857600-209715199, default 209715199):
Using default value 209715199
Partition 3 of type Linux and of size 50 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.
[dave@cndba.cn ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000be31b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
/dev/sda3 104857600 209715199 52428800 83 Linux
Disk /dev/mapper/rhel-root: 47.2 GB, 47240445952 bytes, 92266496 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 /dev/mapper/rhel-swap: 5368 MB, 5368709120 bytes, 10485760 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
[dave@cndba.cn ~]# partprobe /dev/sda
[dave@cndba.cn ~]# mkfs.xfs /dev/sda3
meta-data=/dev/sda3 isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[dave@cndba.cn ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name rhel
PV Size <49.00 GiB / not usable 2.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 12543
Free PE 0
Allocated PE 12543
PV UUID NmljP8-EF0a-Bkkh-EByM-8BF2-7AEE-00j3Z8
[dave@cndba.cn ~]# 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.
[dave@cndba.cn ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name rhel
PV Size <49.00 GiB / not usable 2.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 12543
Free PE 0
Allocated PE 12543
PV UUID NmljP8-EF0a-Bkkh-EByM-8BF2-7AEE-00j3Z8
"/dev/sda3" is a new physical volume of "50.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sda3
VG Name
PV Size 50.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID UlW5MI-vdrC-d4Vx-6Fb6-S32L-CD4m-sAoqu4
[dave@cndba.cn ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 1 2 0 wz--n- <49.00g 0
[dave@cndba.cn ~]# vgextend rhel /dev/sda3
Volume group "rhel" successfully extended
[dave@cndba.cn ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rhel 2 2 0 wz--n- 98.99g <50.00g
[dave@cndba.cn ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root rhel -wi-ao---- <44.00g
swap rhel -wi-ao---- 5.00g
[dave@cndba.cn ~]# lvextend -l +100%free /dev/rhel/root
Size of logical volume rhel/root changed from <44.00 GiB (11263 extents) to 93.99 GiB (24062 extents).
Logical volume rhel/root successfully resized.
[dave@cndba.cn ~]# xfs_growfs /dev/mapper/rhel-root
meta-data=/dev/mapper/rhel-root isize=512 agcount=4, agsize=2883328 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=11533312, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=5631, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 11533312 to 24639488
[dave@cndba.cn ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 94G 30G 65G 32% /
devtmpfs 7.6G 0 7.6G 0% /dev
tmpfs 7.6G 0 7.6G 0% /dev/shm
tmpfs 7.6G 13M 7.6G 1% /run
tmpfs 7.6G 0 7.6G 0% /sys/fs/cgroup
/dev/sda1 1014M 178M 837M 18% /boot
tmpfs 1.6G 16K 1.6G 1% /run/user/42
tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/sr0 4.2G 4.2G 0 100% /mnt
[dave@cndba.cn ~]#
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