GROW FILE SYSTEM ONLINE WITHOUT UMOUNTING THE FILE SYSTEM

Add a new disk to the server in this case /dev/sdo

[root@dha3323ddserver ~]# fdisk -l /dev/sdo

Disk /dev/sdo: 214.7 GB, 214748364800 bytes, 419430400 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

Initialize the disk before using it either way you can still use it without initialization it will still work but it is recommended to initialize the disk and select your disk type.

[root@dha3323ddserver ~]#
[root@dha3323ddserver ~]# fdisk /dev/sdo
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 0x99e7bdeb.

Command (m for help): p

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): p
Partition number (1-4, default 1): 1
First sector (2048-419430399, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-419430399, default 419430399):
Using default value 419430399
Partition 1 of type Linux and of size 200 GiB is set

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 <32M      40 Venix 80286     85 Linux extended c7 Syrinx
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 <3 61 SpeedStor       ab Darwin boot     f2 DOS secondary
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): 8e
Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Device Boot Start End Blocks Id System
/dev/sdo1 2048 419430399 209714176 8e Linux LVM

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

Calling ioctl() to re-read partition table.
Syncing disks.

List the physical volumes available on your server

[root@dha3323ddserver ~]# pvs
PV         VG              Fmt Attr PSize   PFree
/dev/sda3 rootvg          lvm2 a--   41.99g    0
/dev/sdb1 networkerapp_vg lvm2 a-- 200.00g    0
/dev/sdd1 rootvg          lvm2 a--   50.00g    0
/dev/sde1 rootvg          lvm2 a--   50.00g    0
/dev/sdf1 rootvg          lvm2 a-- 100.00g    0
/dev/sdg1 rootvg          lvm2 a-- 100.00g    0
/dev/sdh1 networkerapp_vg lvm2 a-- 100.00g    0
/dev/sdi1 rootvg          lvm2 a-- 100.00g    0
/dev/sdj1 networkerapp_vg lvm2 a-- 100.00g    0
/dev/sdk1 rootvg          lvm2 a-- 150.00g    0
/dev/sdl1 rootvg          lvm2 a-- 200.00g    0
/dev/sdm1 rootvg          lvm2 a-- 200.00g    0
/dev/sdn1 rootvg          lvm2 a-- 100.00g    0
[root@dha3323ddserver ~]#

Now create a PV on the new disk

[root@dha3323ddserver ~]# pvcreate /dev/sdo1
Physical volume "/dev/sdo1" successfully created

List the volume group to see which VG you would like to grow

[root@dha3323ddserver ~]# vgs
VG              #PV #LV #SN Attr   VSize   VFree
networkerapp_vg   3   1   0 wz--n- 399.99g    0
rootvg           10   4   0 wz--n-   1.07t    0
[root@dha3323ddserver ~]#

As you can see my filesystem is 100% used

[root@dha3323ddserver ~]# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root 1.1T 1008G 1.8G 100% /

Extend the VG from the new disk that was added

[root@dha3323ddserver ~]# vgextend rootvg /dev/sdo1
Volume group "rootvg" successfully extended
[root@dha3323ddserver ~]#
[root@dha3323ddserver ~]#
[root@dha3323ddserver ~]#
[root@dha3323ddserver ~]#
[root@dha3323ddserver ~]#

Extend the VG using the new disk

[root@dha3323ddserver ~]# lvextend /dev/mapper/rootvg-root /dev/sdo1
Size of logical volume rootvg/root changed from 1.04 TiB (273791 extents) to 1.24 TiB (324990 extents).
Logical volume root successfully resized
[root@dha3323ddserver ~]#
[root@dha3323ddserver ~]#

Resize the file system
[root@dha3323ddserver ~]# resize2fs /dev/mapper/rootvg-root
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mapper/rootvg-root is mounted on /; on-line resizing required
old_desc_blocks = 134, new_desc_blocks = 159
The filesystem on /dev/mapper/rootvg-root is now 332789760 blocks long.

The filesystem is now increased without any downtime.

[root@dha3323ddserver ~]# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root 1.3T 1008G 191G 85% /
[root@dha3323ddserver ~]#

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GROW FILE SYSTEM ONLINE WITHOUT UMOUNTING THE FILE SYSTEM

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