Manage Logical Volumes2025/08/13 |
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This is the basic operation of managing Logical Volumes. |
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| [1] | Create Logical Volume. |
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# create logical volume [lv_data] in volume group [vg_dlp] with 30G root@dlp:~# lvcreate -L 30G -n lv_data vg_dlp Logical volume "lv_data" created. # specify like follows if you use all free area root@dlp:~# lvcreate -l 100%FREE -n lv_data vg_dlp Logical volume "lv_data" created |
| [2] | Display Logical Volumes. |
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root@dlp:~# lvdisplay /dev/vg_dlp/lv_data --- Logical volume --- LV Path /dev/vg_dlp/lv_data LV Name lv_data VG Name vg_dlp LV UUID hSE9ec-tSYu-PqY0-xGXn-mCxf-u94f-dakGEE LV Write Access read/write LV Creation host, time dlp.srv.world, 2025-08-12 15:08:28 +0900 LV Status available # open 0 LV Size 30.00 GiB Current LE 7680 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 |
| [3] | Rename Logical Volume. |
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# rename from lv_data to lv_storage root@dlp:~# lvrename vg_dlp lv_data lv_storage Renamed "lv_data" to "lv_storage" in volume group "vg_dlp"root@dlp:~# lvdisplay /dev/vg_dlp/lv_storage --- Logical volume --- LV Path /dev/vg_dlp/lv_storage LV Name lv_storage VG Name vg_dlp LV UUID hSE9ec-tSYu-PqY0-xGXn-mCxf-u94f-dakGEE LV Write Access read/write LV Creation host, time dlp.srv.world, 2025-08-12 15:08:28 +0900 LV Status available # open 0 LV Size 30.00 GiB Current LE 7680 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 |
| [4] | Display reports of Logical Volumes. |
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root@dlp:~# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root debian-vg -wi-ao---- 74.98g swap_1 debian-vg -wi-ao---- <4.06g lv_storage vg_dlp -wi-a----- 30.00g |
| [5] | Scan Logical Volumes. |
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root@dlp:~# lvscan ACTIVE '/dev/debian-vg/root' [74.98 GiB] inherit ACTIVE '/dev/debian-vg/swap_1' [<4.06 GiB] inherit ACTIVE '/dev/vg_dlp/lv_storage' [30.00 GiB] inherit |
| [6] | Take snapshot of Logical Volume. |
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# create snapshot "snap-lv_storage" from "lv_storage" root@dlp:~# lvcreate -s -L 30G -n snap-lv_storage /dev/vg_dlp/lv_storage Logical volume "snap-lv_storage" created.root@dlp:~# lvdisplay /dev/vg_dlp/lv_storage /dev/vg_dlp/snap-lv_storage
--- Logical volume ---
LV Path /dev/vg_dlp/lv_storage
LV Name lv_storage
VG Name vg_dlp
LV UUID hSE9ec-tSYu-PqY0-xGXn-mCxf-u94f-dakGEE
LV Write Access read/write
LV Creation host, time dlp.srv.world, 2025-08-12 15:08:28 +0900
LV snapshot status source of
snap-lv_storage [active]
LV Status available
# open 0
LV Size 30.00 GiB
Current LE 7680
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/vg_dlp/snap-lv_storage
LV Name snap-lv_storage
VG Name vg_dlp
LV UUID 5EP4en-BQMZ-S0po-Pyr3-Qtje-fxaP-0WBocd
LV Write Access read/write
LV Creation host, time dlp.srv.world, 2025-08-12 15:10:14 +0900
LV snapshot status active destination for lv_storage
LV Status available
# open 0
LV Size 30.00 GiB
Current LE 7680
COW-table size 30.00 GiB
COW-table LE 7680
Allocated to snapshot 0.00%
Snapshot chunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:5
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| [7] | Extend Logical Volume. It's possible to do with mounted. |
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root@dlp:~# lvextend -L 70G /dev/vg_dlp/lv_storage Size of logical volume vg_dlp/lv_storage changed from 30.00 GiB (7680 extents) to 70.00 GiB (17920 extents). Logical volume vg_dlp/lv_storage successfully resized.root@dlp:~# lvdisplay /dev/vg_dlp/lv_storage --- Logical volume --- LV Path /dev/vg_dlp/lv_storage LV Name lv_storage VG Name vg_dlp LV UUID hSE9ec-tSYu-PqY0-xGXn-mCxf-u94f-dakGEE LV Write Access read/write LV Creation host, time dlp.srv.world, 2025-08-12 15:08:28 +0900 LV Status available # open 0 LV Size 70.00 GiB Current LE 17920 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 # for the case of extending ext4 filesystem root@dlp:~# resize2fs /dev/vg_dlp/lv_storage resize2fs 1.47.2 (1-Jan-2025) Resizing the filesystem on /dev/vg_dlp/lv_storage to 18350080 (4k) blocks. The filesystem on /dev/vg_dlp/lv_storage is now 18350080 (4k) blocks long. |
| [8] | Reduce Logical Volume. Unmount target device first. It's impossible to reduce xfs filesystem. |
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# for ext4, check it first root@dlp:~# e2fsck -f /dev/vg_dlp/lv_storage e2fsck 1.47.2 (1-Jan-2025) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/vg_dlp/lv_storage: 12/4587520 files (0.0% non-contiguous), 334503/18350080 blocks # for ext4, reduce filesystem root@dlp:~# resize2fs /dev/vg_dlp/lv_storage 50G resize2fs 1.47.2 (1-Jan-2025) Resizing the filesystem on /dev/vg_dlp/lv_storage to 13107200 (4k) blocks. The filesystem on /dev/vg_dlp/lv_storage is now 13107200 (4k) blocks long. # reduce logical volume at last root@dlp:~# lvreduce -L 50G /dev/vg_dlp/lv_storage File system ext4 found on vg_dlp/lv_storage. File system size (50.00 GiB) is equal to the requested size (50.00 GiB). File system reduce is not needed, skipping. Size of logical volume vg_dlp/lv_storage changed from 70.00 GiB (17920 extents) to 50.00 GiB (12800 extents). Logical volume vg_dlp/lv_storage successfully resized. |
| [9] | Delete Logical Volume. unmount ⇒ stop logical volume ⇒ delete logical volume |
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root@dlp:~# lvchange -an /dev/vg_dlp/lv_storage root@dlp:~# lvremove /dev/vg_dlp/lv_storage
Do you really want to remove and DISCARD logical volume vg_dlp/lv_storage? [y/n]: y
Logical volume "lv_storage" successfully removed
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