[Linux] Extend space of root disk in Linux7

[root@node1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 26G 17G 9.8G 63% /　★totally 26G
devtmpfs 1.4G 0 1.4G 0% /dev
tmpfs 1.4G 0 1.4G 0% /dev/shm
tmpfs 1.4G 8.8M 1.4G 1% /run
tmpfs 1.4G 0 1.4G 0% /sys/fs/cgroup
/dev/sda1 1014M 178M 837M 18% /boot
tmpfs 285M 16K 285M 1% /run/user/0
[root@node1 ~]# fdisk -l　★Check disk info

Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 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: 0x000db4a0

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 62914559 30407680 8e Linux LVM

Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors　★New disk detected
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-root: 27.9 GB, 27913093120 bytes, 54517760 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: 3221 MB, 3221225472 bytes, 6291456 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

[root@node1 ~]# parted -l　★Check disk partition
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 32.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 1049kB 1075MB 1074MB primary xfs boot
2 1075MB 32.2GB 31.1GB primary lvm

Error: /dev/sdb: unrecognised disk label
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sdb: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/centos-swap: 3221MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number Start End Size File system Flags
1 0.00B 3221MB 3221MB linux-swap(v1)

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/centos-root: 27.9GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number Start End Size File system Flags
1 0.00B 27.9GB 27.9GB xfs

[root@node1 ~]# vgdisplay　★Check VG
--- 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 <29.00 GiB
PE Size 4.00 MiB
Total PE 7423
Alloc PE / Size 7423 / <29.00 GiB
Free PE / Size 0 / 0
VG UUID hsgPKH-ONEj-HrAg-efnA-CT6E-c6jv-2yRixu

[root@node1 ~]# lvdisplay　★Check LV
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID jxntjj-2vw1-iZZl-rKGs-N0br-TueY-k7EcfQ
LV Write Access read/write
LV Creation host, time node1, 2019-01-09 15:27:52 +0900
LV Status available
# open 2
LV Size 3.00 GiB
Current LE 768
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1

--- Logical volume ---
LV Path /dev/centos/root　★this LV will be extended.
LV Name root
VG Name centos
LV UUID Hdc1jk-0TNj-7rze-F3Vr-XmVK-NeWe-1DGffp
LV Write Access read/write
LV Creation host, time node1, 2019-01-09 15:27:53 +0900
LV Status available
# open 1
LV Size <26.00 GiB
Current LE 6655
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0

[root@node1 ~]# vgextend centos /dev/sdb　★First, extend VG
Physical volume "/dev/sdb" successfully created.
Volume group "centos" successfully extended
[root@node1 ~]# vgdisplay　★
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 48.99 GiB　★done.
PE Size 4.00 MiB
Total PE 12542
Alloc PE / Size 7423 / <29.00 GiB
Free PE / Size 5119 / <20.00 GiB
VG UUID hsgPKH-ONEj-HrAg-efnA-CT6E-c6jv-2yRixu
[root@node1 ~]# lvextend -l +100%FREE /dev/centos/root　★Second, extend LV
Size of logical volume centos/root changed from <45.00 GiB (11519 extents) to 45.99 GiB (11774 extents).
Logical volume centos/root successfully resized.
[root@node1 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID jxntjj-2vw1-iZZl-rKGs-N0br-TueY-k7EcfQ
LV Write Access read/write
LV Creation host, time node1, 2019-01-09 15:27:52 +0900
LV Status available
# open 2
LV Size 3.00 GiB
Current LE 768
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1

--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID Hdc1jk-0TNj-7rze-F3Vr-XmVK-NeWe-1DGffp
LV Write Access read/write
LV Creation host, time node1, 2019-01-09 15:27:53 +0900
LV Status available
# open 1
LV Size 45.99 GiB　★Done.
Current LE 11774
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0

[root@node1 ~]# xfs_growfs /dev/centos/root　★Use xfs_growfs to extend the size of Filesystem.(Like resize2fs in Linux5)
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=1703680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=6814720, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=3327, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 6814720 to 12056576
[root@node1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 46G 17G 30G 36% /
devtmpfs 1.4G 0 1.4G 0% /dev
tmpfs 1.4G 0 1.4G 0% /dev/shm
tmpfs 1.4G 8.8M 1.4G 1% /run
tmpfs 1.4G 0 1.4G 0% /sys/fs/cgroup
/dev/sda1 1014M 178M 837M 18% /boot
tmpfs 285M 20K 285M 1% /run/user/0