原来/dev/sda是500G，后续扩展到了1T ，查看硬盘信息，Disk /dev/sda: 1099.5 GB可以看到容量已经添加进来。
[root@master-99 ~]# fdisk -l
Disk /dev/sda: 1099.5 GB, 1099511627776 bytes, 2147483648 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: 0x000a052c
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 1048575999 523238400 8e Linux LVM
Disk /dev/sdb: 536.9 GB, 536870912000 bytes, 1048576000 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: 0x000e2d5c
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1048575999 524286976 8e Linux LVM
Disk /dev/mapper/centos-root: 531.6 GB, 531628032000 bytes, 1038336000 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/centos-swap: 4160 MB, 4160749568 bytes, 8126464 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/VolGroup_master99-pv_master99: 515.4 GB, 515396075520 bytes, 1006632960 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
如果fdisk -l看不到新增加容量，可以执行
ls /sys/class/scsi_disk/
0:0:0:0
echo 1 >/sys/class/scsi_disk/0\:0\:0\:0/device/rescan
#注意这里的对应磁盘关系
#[root@master-99 ~]# ls /sys/class/scsi_disk/
#0:0:0:0 0:0:1:0
#[root@master-99 ~]#
#这个机器显示有两个盘
此次添加容量的方式为添加pv组，再来扩展
添加分区
[root@master-99 ~]# 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): 1
Value out of range.
Partition number (3,4, default 3): 3
First sector (1048576000-2147483647, default 1048576000):
Using default value 1048576000
Last sector, +sectors or +size{K,M,G} (1048576000-2147483647, default 2147483647):
Using default value 2147483647
Partition 3 of type Linux and of size 524 GiB is set
Command (m for help): t
Partition number (1-3, default 3): 8e
Partition number (1-3, default 3):
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to '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.
查看是否生效
[root@master-99 ~]# fdisk -l
Disk /dev/sda: 1099.5 GB, 1099511627776 bytes, 2147483648 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: 0x000a052c
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 1048575999 523238400 8e Linux LVM
/dev/sda3 1048576000 2147483647 549453824 8e Linux LVM
Disk /dev/sdb: 536.9 GB, 536870912000 bytes, 1048576000 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: 0x000e2d5c
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1048575999 524286976 8e Linux LVM
Disk /dev/mapper/centos-root: 531.6 GB, 531628032000 bytes, 1038336000 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/centos-swap: 4160 MB, 4160749568 bytes, 8126464 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/VolGroup_master99-pv_master99: 515.4 GB, 515396075520 bytes, 1006632960 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
/dev/sda3已经生成
添加pv
查看现有的pv
[root@master-99 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <499.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 127743
Free PE 1
Allocated PE 127742
PV UUID dqCdkC-5dIt-1oFV-1dfo-rtby-37Gz-8HRVUI
--- Physical volume ---
PV Name /dev/sdb1
VG Name VolGroup_master99
PV Size <500.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 127999
Free PE 5119
Allocated PE 122880
PV UUID ENqOjD-gr6J-mfqM-GVYC-zMsc-2BNY-3jDuXK
创建pv，partprobe是同步磁盘状态命令必须要，否则报找不到sda3的报错
[root@master-99 ~]# partprobe
[root@master-99 ~]# pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created.
Pv创建成功
创建vg
查看vg
[root@master-99 ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <499.00 GiB
PE Size 4.00 MiB
Total PE 127743
Alloc PE / Size 127742 / 498.99 GiB
Free PE / Size 1 / 4.00 MiB
VG UUID fbJzNI-33fm-gAdr-wYnU-6fcg-HcRm-qG6WPV
--- Volume group ---
VG Name VolGroup_master99
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size <500.00 GiB
PE Size 4.00 MiB
Total PE 127999
Alloc PE / Size 122880 / 480.00 GiB
Free PE / Size 5119 / <20.00 GiB
VG UUID DftoEH-sjvA-Qx8A-J0WE-Hv3y-UX5J-SW3431
centos在这里对应的是根目录的lv挂载，所以对名为centos的vg进行扩展
[root@master-99 ~]# vgextend centos /dev/sda3
Volume group "centos" successfully extended
扩展lv
查看lv卷
[root@master-99 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID aAfIij-18cD-v0m3-WbOl-lieu-J50M-gI2yNZ
LV Write Access read/write
LV Creation host, time localhost, 2021-12-23 18:52:05 +0800
LV Status available
# open 1
LV Size <495.12 GiB
Current LE 126750
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID OeW85N-8fPQ-CTcj-Atfs-Kv2L-sHF4-R5dbtp
LV Write Access read/write
LV Creation host, time localhost, 2021-12-23 18:52:06 +0800
LV Status available
# open 2
LV Size <3.88 GiB
Current LE 992
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/VolGroup_master99/pv_master99
LV Name pv_master99
VG Name VolGroup_master99
LV UUID 5Gkijh-dxNB-rctp-ogkN-zUcl-gC9L-JhYeQB
LV Write Access read/write
LV Creation host, time master-99, 2022-03-31 23:28:53 +0800
LV Status available
# open 1
LV Size 480.00 GiB
Current LE 122880
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
/dev/centos/root对应的vg为centos，所以对/dev/centos/root进行扩展
[root@master-99 ~]# lvextend -l +100%free /dev/centos/root
Size of logical volume centos/root changed from <495.12 GiB (126750 extents) to <1019.12 GiB (260894 extents).
Logical volume centos/root successfully resized.
[root@master-99 ~]# df -h |grep -v var
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 14M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/mapper/centos-root 495G 324G 172G 66% /
/dev/sda1 1014M 153M 862M 16% /boot
/dev/mapper/VolGroup_master99-pv_master99 473G 64G 386G 15% /root/tools
tmpfs 3.2G 0 3.2G 0% /run/user/0
刷新磁盘
[root@master-99 ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=32448000 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=129792000, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=63375, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 129792000 to 267155456
查看效果，可以看到/dev/mapper/centos-root已经扩展到1T
[root@master-99 ~]# df -h |grep -v var
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 14M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/mapper/centos-root 1019G 324G 696G 32% /
/dev/sda1 1014M 153M 862M 16% /boot
/dev/mapper/VolGroup_master99-pv_master99 473G 64G 386G 15% /root/tools
tmpfs 3.2G 0 3.2G 0% /run/user/0
Q.E.D.