How to extend/increase the size of a existing Linux LVM disk by adding a new disk
Posted by Mir Sayeed Hassan on February 3rd, 2021
How to extend/increase the size of a existing Linux LVM disk by adding a new disk
Detect the new disk space
[root@testdb ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
New disk allocated to extend existing disk
[root@testdb ~]# fdisk -l Disk /dev/sdf: 322.1 GB, 322122547200 bytes 255 heads, 63 sectors/track, 39162 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Partition the new disk
[root@testdb ~]# fdisk /dev/sdf
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xdac6f363.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): p
Disk /dev/sdf: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xdac6f363
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-39162, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-39162, default 39162):
Using default value 39162
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sdf: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xdac6f363
Device Boot Start End Blocks Id System
/dev/sdf1 1 39162 314568733+ 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
Verify
[root@testdb ~]# fdisk -l Disk /dev/sdf: 322.1 GB, 322122547200 bytes 255 heads, 63 sectors/track, 39162 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xdac6f363 Device Boot Start End Blocks Id System /dev/sdf1 1 39162 314568733+ 8e Linux LVM
Increasing the logical volume
[root@testb ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 vg_db lvm2 a-- 29.51g 0 /dev/sdc1 vg_db lvm2 a-- 30.00g 0 /dev/sde vgod1 lvm2 a-- 50.00g 200.00m
[root@testdb ~]# pvcreate /dev/sdf1 Physical volume "/dev/sdf1" successfully created [root@testdb ~]# pvdisplay /dev/sdf1 "/dev/sdf1" is a new physical volume of "300.00 GiB" --- NEW Physical volume --- PV Name /dev/sdf1 VG Name PV Size 300.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID M4FH0u-EJsm-LTWX-ExVL-IxYO-wBN2-w8Gpcg
[root@testdb ~]# vgs VG #PV #LV #SN Attr VSize VFree vg_db 2 2 0 wz--n- 59.50g 0 vgod1 1 1 0 wz--n- 50.00g 200.00m
[root@testdb ~]# lvdisplay --- Logical volume --- LV Path /dev/vgod1/lvod1 LV Name lvod1 VG Name vgod1 LV UUID M6FN4t-L7yl-fD4g-OQ8S-ifqV-ey5u-pTZnXa LV Write Access read/write LV Creation host, time xrmdb, 2020-07-15 18:54:05 +0430 LV Status available # open 1 LV Size 49.80 GiB Current LE 12749 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:2 --- Logical volume --- LV Path /dev/vg_db/root LV Name root VG Name vg_db LV UUID eez7EB-bgNa-tMh5-ye90-FYzl-SJs8-qjWaOE LV Write Access read/write LV Creation host, time DB, 2016-02-03 08:24:00 +0330 LV Status available # open 1 LV Size 51.69 GiB Current LE 13233 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:0 --- Logical volume --- LV Path /dev/vg_db/swap LV Name swap VG Name vg_db LV UUID av6BuN-Dqm2-jMcD-g7HX-5fNU-q2dp-V1nW50 LV Write Access read/write LV Creation host, time DB, 2016-02-03 08:24:02 +0330 LV Status available # open 2 LV Size 7.81 GiB Current LE 2000 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:1
Extend the logical volume into existing disk
[root@testdb ~]# vgextend vgod1 /dev/sdf1 Volume group "vgod1" successfully extended
[root@testdb ~]# lvextend -l +100%FREE /dev/vgod1/lvod1 Size of logical volume vgod1/lvod1 changed from 49.80 GiB (12749 extents) to 349.99 GiB (89597 extents). Logical volume lvod1 successfully resized
Resize into existing disk
[root@testdb ~]# resize2fs /dev/vgod1/lvod1 resize2fs 1.43-WIP (20-Jun-2013) Filesystem at /dev/vgod1/lvod1 is mounted on /oradata1; on-line resizing required old_desc_blocks = 4, new_desc_blocks = 22 The filesystem on /dev/vgod1/lvod1 is now 91747328 blocks long.
Verify
[root@testdb ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_db-root 51G 31G 18G 63% / tmpfs 5.8G 232K 5.8G 1% /dev/shm /dev/sda1 477M 79M 370M 18% /boot /dev/sdb1 99G 49G 45G 53% /oradata /dev/sdd1 99G 82G 12G 88% /u02 /dev/mapper/vgod1-lvod1 345G 12G 318G 4% /oradata1