Resize an LV - Best Practices| Alibaba Cloud Documentation Center

This topic describes how to use Logical Volume Manager (LVM) to resize a logical volume (LV) on a Linux ECS instance.

Prerequisites

An LV is created. For more information, see Create an LV.
A cloud disk is resized in the console. For more information, see Step 2: Resize the disk in the ECS console. In this example, /dev/vdf is resized by 500 GiB.

Procedure

Remotely connect to an ECS instance as a root user. For more information, see Overview.

Run the following command to view information about the LV that is created on the ECS instance:

lvdisplay

The following command output shows that the /dev/lvm_01/lv01 LV is created and has 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 following command to resize the PV. Replace /dev/vdf with the name of the cloud disk that you want to resize.
```
pvresize /dev/vdf
```
The following command output shows that the /dev/vdf PV is resized:
```
root@lvs06:~# pvresize /dev/vdf
  Physical volume "/dev/vdf" changed
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized
```

Run the following command to view the PV usage:

pvs

The following command output shows that the /dev/vdf PV 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 <523.98g

Run the following command to resize the LV:
```
lvextend -L +500GB /dev/lvm_01/lv01
```
The following section describes the variables in this example. You must modify the variables based on your actual needs.
- +500GB: increases or decreases the capacity. You can resize the LV only when the VG has remaining capacity.
- /dev/lvm_01/lv01: the name of the LV.
The following command output shows that the /dev/lvm_01/lv01 LV is resized 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 following command to resize the file system of the LV:

resize2fs /dev/lvm_01/lv01

A command output similar to the following one is displayed:

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 following command to check whether the file system is resized:

df -h

The following command output shows that the total capacity of the LV is 5.5 TiB, which indicates that the file system is resized.

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