Ubuntu LVM 磁盘扩容 参考： https://blog.csdn.net/yjk13703623757/article/details/80267647
--------》查看现有磁盘空间
root@ubuntu_server:/dev# df -hl
Filesystem Size Used Avail Use% Mounted on
udev 957M 0 957M 0% /dev
tmpfs 198M 1.2M 196M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 3.9G 3.9G 0 100% / --------------》原来磁盘空间
tmpfs 986M 0 986M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 986M 0 986M 0% /sys/fs/cgroup
/dev/loop0 90M 90M 0 100% /snap/core/6130
/dev/loop1 87M 87M 0 100% /snap/core/4917
/dev/sda2 976M 139M 771M 16% /boot
tmpfs 197M 0 197M 0% /run/user/1000
tmpfs 197M 0 197M 0% /run/user/0
--------->扩容失败
root@ubuntu_server:/dev# sudo lvresize -L +10G /dev/mapper/ubuntu--vg-ubuntu--lv
/etc/lvm/archive/.lvm_ubuntu_server_6698_1809159778: write error failed: No space left on device --------------》失败
--------》使用了lvresize，重新调整了（+10G）/dev/ubuntu-vg/root的lv大小，并刷新了文件系统。（扩展磁盘）
root@ubuntu_server:/dev# lvresize -A n -L +10G /dev/mapper/ubuntu--vg-ubuntu--lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 4.00 GiB (1024 extents) to 14.00 GiB (3584 extents).
WARNING: This metadata update is NOT backed up.
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
--------》扩张文件系统
root@ubuntu_server:/dev# resize2fs -p /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.44.1 (24-Mar-2018)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 2
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 3670016 (4k) blocks long.
----------》再次查看磁盘使用情况（扩容成功）
root@ubuntu_server:/dev# df -hl
Filesystem Size Used Avail Use% Mounted on
udev 957M 0 957M 0% /dev
tmpfs 198M 1.2M 196M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 14G 3.9G 9.3G 30% / --------------》现在的磁盘空间
tmpfs 986M 0 986M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 986M 0 986M 0% /sys/fs/cgroup
/dev/loop0 90M 90M 0 100% /snap/core/6130
/dev/loop1 87M 87M 0 100% /snap/core/4917
/dev/sda2 976M 139M 771M 16% /boot
tmpfs 197M 0 197M 0% /run/user/1000
tmpfs