从零开始创建LVM分区方案
环境信息
- 磁盘分区:
/dev/nvme0n1p4
root@iStoreOS:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 238.5G 0 disk
└─sda1 8:1 0 238.5G 0 part /mnt/usb2_2-1
nbd0 43:0 0 0B 0 disk
nbd1 43:32 0 0B 0 disk
nbd2 43:64 0 0B 0 disk
nbd3 43:96 0 0B 0 disk
nbd4 43:128 0 0B 0 disk
nbd5 43:160 0 0B 0 disk
nbd6 43:192 0 0B 0 disk
nbd7 43:224 0 0B 0 disk
nvme0n1 259:0 0 953.9G 0 disk
├─nvme0n1p1 259:1 0 128M 0 part /boot
│ /boot
├─nvme0n1p2 259:2 0 256M 0 part /rom
├─nvme0n1p3 259:3 0 2G 0 part /overlay/upper/opt/docker
│ /overlay
└─nvme0n1p4 259:4 0 951.5G 0 part
安装LVM2
root@iStoreOS:~# opkg install lvm2
Installing lvm2 (2.03.16-1) to root...
Downloading https://mirrors.tuna.tsinghua.edu.cn/openwrt/releases/22.03.5/packages/x86_64/packages/lvm2_2.03.16-1_x86_64.ipk
Installing libaio (0.3.112-2) to root...
Downloading https://mirrors.tuna.tsinghua.edu.cn/openwrt/releases/22.03.5/packages/x86_64/packages/libaio_0.3.112-2_x86_64.ipk
Configuring libaio.
Configuring lvm2.
File descriptor 3 (/tmp/lock/opkg.lock) leaked on lvm invocation. Parent PID 21055: /bin/sh
File descriptor 3 (/tmp/lock/opkg.lock) leaked on lvm invocation. Parent PID 21055: /bin/sh
磁盘分区
分区格式化
创建lvm分区，需要先对磁盘分区进行格式化操做
root@iStoreOS:~# mkfs.ext4 /dev/nvme0n1p4
mke2fs 1.46.5 (30-Dec-2021)
Found a gpt partition table in /dev/nvme0n1p4
Proceed anyway? (y,N) y
Discarding device blocks: done
Creating filesystem with 249428305 4k blocks and 62357504 inodes
Filesystem UUID: 8e4c37a3-4f78-4040-9e86-34baa2af5cb2
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848
Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done
配置LVM
创建PV
pv是一个逻辑卷,相当于一个虚拟磁盘
root@iStoreOS:~# pvcreate lvm /dev/nvme0n1p4
No device found for lvm.
Physical volume "/dev/nvme0n1p4" successfully created.
root@iStoreOS:~# pvdisplay
"/dev/nvme0n1p4" is a new physical volume of "951.49 GiB"
--- NEW Physical volume ---
PV Name /dev/nvme0n1p4
VG Name
PV Size 951.49 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID YM02sw-Nb7v-aE0y-fanC-YHJX-rEZd-ZPo8mv
/dev/nvme0n1p4： 需要创建LVM分区的磁盘分区
lvm： 设置pv的名称
创建vg
VG 是由一个或多个物理卷（Physical Volumes，PV）组成的逻辑容器，用于存储和管理逻辑卷（Logical Volumes，LV），类似于云计算的资源池。
命令如下
vgcreate lvg /dev/nvme0n1p4
lvg：设置vg的名称/dev/nvme0n1p4：需要添加的磁盘分区,该参数可以添加多个
root@iStoreOS:~# vgcreate lvg /dev/nvme0n1p4
Volume group "lvg" successfully created
root@iStoreOS:~# vgdisplay
--- Volume group ---
VG Name lvg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 951.49 GiB
PE Size 4.00 MiB
Total PE 243582
Alloc PE / Size 0 / 0
Free PE / Size 243582 / 951.49 GiB
VG UUID QYKacr-LDgd-clCw-0l3K-qHzo-nQkD-8jC2jz
创建LV
LV就是虚拟分区
创建第一个lv分区
root@iStoreOS:~# lvcreate -n wxy -L 780G lvg
Logical volume "wxy" created.
root@iStoreOS:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
nvme0n1 259:0 0 953.9G 0 disk
├─nvme0n1p1 259:1 0 128M 0 part /boot
│ /boot
├─nvme0n1p2 259:2 0 256M 0 part /rom
├─nvme0n1p3 259:3 0 2G 0 part /overlay/upper/opt/docker
│ /overlay
└─nvme0n1p4 259:4 0 951.5G 0 part
└─lvg-wxy 253:0 0 780G 0 lvm
wxy：创建的lv名称lvg：lv所属的卷组-L 780G：使用-L参数指定改lv的大小
创建第二个分区
root@iStoreOS:~# lvcreate -n user -L 70G lvg
Logical volume "user" created.
创建第三个分区
root@iStoreOS:~# lvcreate -n docker -l +100%FREE lvg
Logical volume "docker" created.
root@iStoreOS:~#
-l +100%FREE：将剩余空间全部添加给名称docker的lv
格式化lv
首先查看当前分区列表
root@iStoreOS:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 238.5G 0 disk
└─sda1 8:1 0 238.5G 0 part /mnt/usb2_2-1
nbd0 43:0 0 0B 0 disk
nbd1 43:32 0 0B 0 disk
nbd2 43:64 0 0B 0 disk
nbd3 43:96 0 0B 0 disk
nbd4 43:128 0 0B 0 disk
nbd5 43:160 0 0B 0 disk
nbd6 43:192 0 0B 0 disk
nbd7 43:224 0 0B 0 disk
nvme0n1 259:0 0 953.9G 0 disk
├─nvme0n1p1 259:1 0 128M 0 part /boot
│ /boot
├─nvme0n1p2 259:2 0 256M 0 part /rom
├─nvme0n1p3 259:3 0 2G 0 part /overlay/upper/opt/docker
│ /overlay
└─nvme0n1p4 259:4 0 951.5G 0 part
├─lvg-wxy 253:0 0 780G 0 lvm
├─lvg-user 253:1 0 70G 0 lvm
└─lvg-docker 253:2 0 101.5G 0 lvm
格式化docker
root@iStoreOS:~# mkfs.ext4 /dev/lvg/docker
mke2fs 1.46.5 (30-Dec-2021)
Discarding device blocks: done
Creating filesystem with 26605568 4k blocks and 6651904 inodes
Filesystem UUID: 07081ca1-5a03-426b-8274-4c7ad790230c
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872
Allocating group tables: done
Writing inode tables: done
Creating journal (131072 blocks): done
Writing superblocks and filesystem accounting information: done
格式化wxy
root@iStoreOS:~# mkfs.ext4 /dev/lvg/wxy
mke2fs 1.46.5 (30-Dec-2021)
Discarding device blocks: done
Creating filesystem with 204472320 4k blocks and 51118080 inodes
Filesystem UUID: af252620-3010-49f1-bc02-474b208eba90
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000
Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done
格式化user
root@iStoreOS:~# mkfs.ext4 /dev/lvg/user
mke2fs 1.46.5 (30-Dec-2021)
Discarding device blocks: done
Creating filesystem with 18350080 4k blocks and 4587520 inodes
Filesystem UUID: 3f6044e9-939d-43cb-b618-d7a437361597
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Allocating group tables: done
Writing inode tables: done
Creating journal (131072 blocks): done
Writing superblocks and filesystem accounting information: done
root@iStoreOS:~#
挂载lv
root@iStoreOS:~# mkdir /wxy
root@iStoreOS:~# mount /dev/lvg/wxy /wxy/
root@iStoreOS:~# touch /wxy/1
root@iStoreOS:~# df -h
Filesystem Size Used Available Use% Mounted on
/dev/root 154.3M 154.3M 0 100% /rom
tmpfs 7.7G 4.3M 7.7G 0% /tmp
/dev/nvme0n1p3 1.9G 3.7M 1.9G 0% /overlay
overlayfs:/overlay 1.9G 3.7M 1.9G 0% /
tmpfs 4.0M 0 4.0M 0% /mnt
/dev/nvme0n1p1 127.7M 5.5M 122.2M 4% /boot
/dev/nvme0n1p1 127.7M 5.5M 122.2M 4% /boot
tmpfs 512.0K 0 512.0K 0% /dev
cgroup 7.7G 0 7.7G 0% /sys/fs/cgroup
/dev/sda1 233.7G 70.0G 151.7G 32% /mnt/usb2_2-1
tmpfs 512.0K 0 512.0K 0% /sys/module/md_mod/parameters/new_array
/dev/nvme0n1p3 1.9G 3.7M 1.9G 0% /overlay/upper/opt/docker
/dev/mapper/lvg-wxy 766.7G 28.0K 727.7G 0% /wxy
root@iStoreOS:~#
仅演示
wxy的挂载,那么到这里就结束了，如果后期需要调整lv分区的大小,可以参考下面的文章
Linux使用LVM调整根分区(扩容)