Resize an LV - Best Practices| Alibaba Cloud Documentation Center

This topic describes how to use the Logical Volume Manager (LVM) to resize a Logical Volume (LV) that consists of multiple cloud disks on a Linux ECS instance.

Prerequisites

You have created an LV. For more information, see Create an LV.

The cloud disks have free space, or the cloud disks have been resized. For more information, see Overview.

Procedure

Remotely connect to an ECS instance as a root user. For more information about detailed steps, see ECS instance creation overview.

Run the lvdisplay command to view information of the LV that has been created in the ECS instance.

You have created the /dev/lvm_01/lv01 LV, which have a physical capacity of 5 TiB.

root@lvs06:~# lvdisplay
  --- Logical volume ---
  LV Path                /dev/lvm_01/lv01
  LV Name                lv01
  VG Name                lvm_01
  LV UUID                svB00x-l6Ke-ES6M-ctsE-9P6d-dVj2-o0h***
  LV Write Access        read/write
  LV Creation host, time lvs06, 2019-06-0615:27:19 +0800
  LV Status              available
  # open                 0
  LV Size                5.00 TiB
  Current LE             1310720
  Segments               6
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

Run the pvs command to view the Physical Volume (PV) usage.

The /dev/vdg data disk has a free space of 500 GiB.

root@lvs06:~# pvs
  PV         VG     Fmt  Attr PSize     PFree
  /dev/vdb   lvm_01 lvm2 a--  <1024.00g       0
  /dev/vdc   lvm_01 lvm2 a--  <1024.00g       0
  /dev/vdd   lvm_01 lvm2 a--  <1024.00g       0
  /dev/vde   lvm_01 lvm2 a--  <1024.00g       0
  /dev/vdf   lvm_01 lvm2 a--  <1024.00g       0
  /dev/vdg   lvm_01 lvm2 a--  <1024.00g <523.98g

Run the lvextend command to resize the LV.
```
lvextend [-L +/- <Capacity to be resized>] <LV name>
```
Note
- Capacity to be resized: the LV can be resize only when the Volume Group (VG) has sufficient free space. In this example, you resize the LV from 5 TiB to 5.5 TiB.
- LV name: the name of the LV to be resized.
You resize the /dev/lvm_01/lv01 LV by a physical capacity of 500 GiB.
```
root@lvs06:~# lvextend -L +500GB /dev/lvm_01/lv01
Size of logical volume lvm_01/lv01 changed from5.00 TiB (1310720 extents) to <5.49 TiB (1438720 extents).
Logical volume lvm_01/lv01 successfully resized.
```

Run the resize2fs command to resize the file system of the LV.

root@lvs06:~# resize2fs /dev/lvm_01/lv01
resize2fs 1.44.1 (24-Mar-2018)
Filesystem at /dev/lvm_01/lv01 is mounted on /media/lv01; on-line resizing required
old_desc_blocks = 640, new_desc_blocks = 703
The filesystem on /dev/lvm_01/lv01 is now 1473249280 (4k) blocks long.

Run the df command to check the file system result.

The total capacity of the LV is 5.5 TiB, indicating that the resize operation is successful.

root@lvs06:~# df -h
Filesystem               Size  Used Avail Use% Mounted on
udev                      12G     012G   0% /dev
tmpfs                    2.4G  3.7M  2.4G   1% /run
/dev/vda1                 40G  3.6G   34G  10% /
tmpfs                     12G     0   12G   0% /dev/shm
tmpfs                    5.0M     05.0M   0% /run/lock
tmpfs                     12G     012G   0% /sys/fs/cgroup
tmpfs                    2.4G     02.4G   0% /run/user/0
/dev/mapper/lvm_01-lv01  5.5T   83M  5.2T   1% /media/lv01