How to increase root file system if its mounted on lvm(Adding additional disk)

How to increase root file system

Here i have attached new hard disk /dev/sdb  to increase file system size with 10 Gigs

[root@puppetdb ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 25G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-root 253:0 0 17.5G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
sr0 11:0 1 7.2G 0 rom

Creating new physical volume and attaching it to volume group on which root file system is mounted
[root@puppetdb ~]# fdisk /dev/sdb
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.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x56634090.

Command (m for help): p

Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 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: 0x56634090

Device Boot Start End Blocks Id System

Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-20971519, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +5G
Partition 1 of type Linux and of size 5 GiB is set

Command (m for help): p

Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 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: 0x56634090

Device Boot Start End Blocks Id System
/dev/sdb1 2048 10487807 5242880 83 Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): L

0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext’d (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes):
Hex code (type L to list all codes): 8e
Changed type of partition ‘Linux’ to ‘Linux LVM’

Command (m for help): p

Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 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: 0x56634090

Device Boot Start End Blocks Id System
/dev/sdb1 2048 10487807 5242880 8e Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@puppetdb ~]# partprobe
[root@puppetdb ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 25G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-root 253:0 0 17.5G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
└─sdb1 8:17 0 5G 0 part
sr0 11:0 1 7.2G 0 rom

Creating physical volume

[root@puppetdb ~]# pvcreate /dev/sdb1
Physical volume “/dev/sdb1” successfully created

[root@puppetdb ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a– 19.51g 40.00m
/dev/sdb1 centos lvm2 a– 5.00g 5.00g
[root@puppetdb ~]# pvdisplay
— Physical volume —
PV Name /dev/sda2
VG Name centos
PV Size 19.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 4994
Free PE 10
Allocated PE 4984
PV UUID VIXLiJ-uLfL-AfIk-345A-d4Ky-I8iK-kaEB4f

— Physical volume —
PV Name /dev/sdb1
VG Name centos
PV Size 5.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 1279
Free PE 1279
Allocated PE 0
PV UUID TznJ9z-ptpB-yyc9-4umr-96Qn-j4fb-kJWOI6

[root@puppetdb ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz–n- 19.51g 40.00m
[root@puppetdb ~]# 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 19.51 GiB
PE Size 4.00 MiB
Total PE 4994
Alloc PE / Size 4984 / 19.47 GiB
Free PE / Size 10 / 40.00 MiB
VG UUID 13Zb1L-Nyqx-8lYj-ZcmC-R1ih-qMUx-PeXOcV

Adding newly created physical volume to existing volume group which is created on /dev/sda

[root@puppetdb ~]# vgextend centos /dev/sdb1
Volume group “centos” successfully extended

[root@puppetdb ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 2 0 wz–n- 24.50g 5.04g
[root@puppetdb ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao—- 17.47g
swap centos -wi-ao—- 2.00g
[root@puppetdb ~]# lvdisplay
— Logical volume —
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID oxpYu4-Jw4K-oCvl-as6s-Sld0-PdMQ-tDvroC
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-08-29 08:15:20 +0530
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/centos/root
LV Name root
VG Name centos
LV UUID eXtL7R-HSIZ-Vnaq-VbMH-L7rL-P9gW-AFWv5a
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-08-29 08:15:20 +0530
LV Status available
# open 1
LV Size 17.47 GiB
Current LE 4472
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:0

Increasing logical volume of volume group 

[root@puppetdb ~]# lvresize –size +4G /dev/centos/root
Size of logical volume centos/root changed from 17.47 GiB (4472 extents) to 21.47 GiB (5496 extents).
Logical volume root successfully resized.

[root@puppetdb ~]# lvdisplay
— Logical volume —
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID oxpYu4-Jw4K-oCvl-as6s-Sld0-PdMQ-tDvroC
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-08-29 08:15:20 +0530
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/centos/root
LV Name root
VG Name centos
LV UUID eXtL7R-HSIZ-Vnaq-VbMH-L7rL-P9gW-AFWv5a
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-08-29 08:15:20 +0530
LV Status available
# open 1
LV Size 21.47 GiB
Current LE 5496
Segments 2
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:0

[root@puppetdb ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 25G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-root 253:0 0 21.5G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
└─sdb1 8:17 0 5G 0 part
└─centos-root 253:0 0 21.5G 0 lvm /
sr0 11:0 1 7.2G 0 rom

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