preface

I have to learn some usage about lvm on linux, so this is my notice about this. But this is not complete.

extend volume in existing lv

sudo lvdisplay
[sudo] password for debian-buildd:
Sorry, try again.
[sudo] password for debian-buildd:
  --- Logical volume ---
  LV Path                /dev/vg0/swap
  LV Name                swap
  VG Name                vg0
  LV UUID                hmY5Dt-S0GH-wxrN-fE9M-BwU9-bFMP-j2e05Z
  LV Write Access        read/write
  LV Creation host, time unmatched05, 2022-08-10 21:43:43 +0800
  LV Status              available
  # open                 2
  LV Size                100.00 GiB
  Current LE             25600
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:0

  --- Logical volume ---
  LV Path                /dev/vg0/srv
  LV Name                srv
  VG Name                vg0
  LV UUID                T8nIYl-WdwX-hfYr-Yg3N-FiD1-7M1j-R54cGN
  LV Write Access        read/write
  LV Creation host, time unmatched05, 2022-08-10 21:43:43 +0800
  LV Status              available
  # open                 1
  LV Size                40.00 GiB
  Current LE             10240
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:1

This is to check lv (logical volume) for existing lv.

 sudo vgdisplay
  --- Volume group ---
  VG Name               vg0
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.80 TiB
  PE Size               4.00 MiB
  Total PE              472163
  Alloc PE / Size       35840 / 140.00 GiB
  Free  PE / Size       436323 / 1.66 TiB
  VG UUID               VCkz6D-Di19-Oh0a-GtaN-d9Th-sAqQ-ODNswr

This is vg (volume group) info. I think it can give you a picture of whole disk from lvm’s view.

From above info, you will get the information about lv with its path.

sudo lvextend -L +200G /dev/vg0/srv
  Size of logical volume vg0/srv changed from 40.00 GiB (10240 extents) to 240.00 GiB (61440 extents).
  Logical volume vg0/srv successfully resized.

The command is to extend lv with path.

debian-buildd@unmatched05:~$ sudo resize2fs /dev/vg0/srv
resize2fs 1.46.6-rc1 (12-Sep-2022)
Filesystem at /dev/vg0/srv is mounted on /srv; on-line resizing required
old_desc_blocks = 5, new_desc_blocks = 30
The filesystem on /dev/vg0/srv is now 62914560 (4k) blocks long.

Using resize2fs to resize fs.

Verity again:

debian-buildd@unmatched05:~$ df -h /srv
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/vg0-srv  236G  479M  226G   1% /srv

LVM usage

preface

extend volume in existing lv

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