Elastic Compute Service:Extend an LV

Extend a PV in the VG

1. Check the mapping between PVs and disks.

   Run the sudo pvs -a -o +devices command to identify the disk (in the Devices column) that corresponds to the PV (in the PV column). Record the names of the PV and the disk.

   sudo pvs -a -o +devices

     PV         VG    Fmt  Attr PSize   PFree Devices    
     /dev/vda1             ---       0     0             
     /dev/vda2             ---       0     0             
     /dev/vda3             ---       0     0             
     /dev/vdb   vg_01 lvm2 a--  <40.00g    0  /dev/vdb(0)
     /dev/vdc1  vg_01 lvm2 a--  <40.00g    0  /dev/vdc1(0)

   • If the PV was created on an entire disk (without partitions), you only need to resize the disk. In this example, the PV /dev/vdb corresponds to the disk /dev/vdb. It has no partitions, so you only need to resize it.

   • If the PV was created on a partition of a disk, you must resize the disk and then extend the partition. In this example, the PV /dev/vdc1 corresponds to the disk partition /dev/vdc1. The disk name is /dev/vdc, and the partition number is 1. You must extend the partition.

2. Resize the disk.

   1. Go to ECS console - Block Storage. In the top navigation bar, select the target region and resource group.

   2. In the Actions column for the target disk, click Resize.

   3. On the Determine Disk and Read Notes page, review the information and then click I Understand Risks and Have Backed Up Data. Proceed.

   4. On the Configure Resizing Method and New Size page, set the resize parameters, confirm the fee, and then click OK.

      For example, to resize a disk from 40 GiB to 50 GiB, set New Disk Size to 50 GiB.

      Important

      You are charged for the additional capacity when you resize a disk.

   5. (Conditional) If the disk is a subscription disk, wait for the 5-second countdown in the payment dialog box to end, click Complete Payment, complete the payment, return to the resize page, and click Paid. Close the dialog box.

      If you click Paid. Close the dialog box. without completing the payment, click Go to Order Center in the Actions column to complete the payment.

3. (Conditional) If the PV to be extended is on a disk partition, you must extend the partition within the ECS instance.

   Run the following command. Replace <disk_name> and <partition_number> with the disk name and partition number you recorded in Step a.

   Important

   Ensure there is a space between the disk name and the partition number.

   sudo LC_ALL=en_US.UTF-8 growpart <disk_name> <partition_number>

   For example, to extend /dev/vdc1, run sudo LC_ALL=en_US.UTF-8 growpart /dev/vdc 1.

   If the output contains the keyword CHANGED, the command succeeded.

4. Extend the PV.

   Replace <physical_volume_name> with the name you recorded in Step a.

   sudo pvresize <physical_volume_name>

   For example, to extend the PV /dev/vdb, run sudo pvresize /dev/vdb.

   If the output contains the phrase 1 physical volume(s) resized or updated, the command succeeded.

5. Verify that the VG is extended.

   Run sudo vgs and verify that the VFree value has increased as expected.

   sudo vgs

   VG    #PV #LV #SN Attr   VSize  VFree 
   vg_01   2   1   0 wz--n- 89.99g 10.00g

   In this example, the capacity of the vg_01 VG increased from 79.99 GiB to 89.99 GiB, and the free space VFree is now 10 GiB. This matches the expectation, and the VG has been successfully extended.

Add a new PV to the VG

Before you proceed, make sure you have created a new disk and attached it to the target instance. Do not initialize the disk.

1. Find the device name of the new data disk.

   Run sudo lsblk -f. Based on the NAME and FSTYPE columns, identify the device name of the new data disk.

   sudo lsblk -f

   NAME         FSTYPE      LABEL UUID                                   MOUNTPOINT
   vda                                                                   
   ├─vda1                                                                
   ├─vda2       vfat              7938-FA03                              /boot/efi
   └─vda3       ext4        root  33b46ac5-7482-4aa5-8de0-60ab4c3a4c78   /
   vdb          LVM2_member       okx24E-qSjZ-zv9l-lOkm-Pcxu-q6KX-qzRcCu 
   └─vg_01-lv01 xfs               9e2bfe15-074e-4bf5-aac5-62c58299364f   /mnt/lv01
   vdc          LVM2_member       ISeUSM-AhRp-KdNN-7pWJ-HxGW-2AEq-85m9dE 
   └─vg_01-lv01 xfs               9e2bfe15-074e-4bf5-aac5-62c58299364f   /mnt/lv01
   vdd

   In this example, the device vdd has no partitions and its FSTYPE is empty, which indicates it is the new data disk.

2. Create a PV and add it to the VG.

   Important

   The vgextend command initializes the disk as a PV, which deletes all data on the disk. Ensure the disk is empty.

   Replace <new_disk_device_name> with the name you found in the previous step.

   sudo vgextend <volume_group_name> /dev/<new_disk_device_name>

   For example, to initialize the disk vdd as a PV and add it to the VG vg_01, run sudo vgextend vg_01 /dev/vdd.

   If the output contains the phrase successfully extended, the command succeeded.

3. Verify that the VG is extended.

   Run sudo vgs and check if the total capacity of the VG (the value in the VSize column) has increased as expected.

   sudo vgs

   VG    #PV #LV #SN Attr   VSize   VFree  
   vg_01   3   1   0 wz--n- <89.99g <10.00g

   In this example, the capacity of the vg_01 VG increased from 79.99 GiB to 89.99 GiB, and the free space VFree is approximately 10 GiB. This matches the expectation, and the VG has been successfully extended.