Linux LVM 管理测试

理论基础可参考 https://linux.cn/article-12670-1.html

测试中使用loop设备模拟硬盘， 测试添加，扩容，移除等操作

初始化脚本

# 创建并挂在4个loop设备, 模拟4块硬盘
for i in {1..5} ; do 
    dd if=/dev/zero of=loop-"$i".img bs=1M count=40
    sudo losetup /dev/loop"$i" loop-"$i".img
done

# 创建物理卷
sudo pvcreate /dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4
# 创建卷组
sudo vgcreate vg01 /dev/loop1 /dev/loop2
sudo vgcreate vg02  /dev/loop3 /dev/loop4
sudo lvcreate -l 10 -n lv01 vg01
sudo lvcreate -l 10 -n lv02 vg02
# 默认PE大小4M， -s修改
# sudo lvcreate -l 10 -s 16M -n lv02 vg02
# 格式化逻辑卷
sudo mkfs.ext4 /dev/vg01/lv01
sudo mkfs.ext4 /dev/vg02/lv02
# 挂载
sudo mkdir /lv01 /lv02
sudo mount /dev/vg01/lv01 /lv01
sudo mount /dev/vg02/lv02 /lv02

卷组vg扩容

# 给lv01卷添加一块硬盘
sudo pvcreate /dev/loop5
# lv01用的是vg01组，添加到vg01组
sudo vgextend vg01 /dev/loop5
# 查看详情
sudo vgdisplay -v vg01

  --- Volume group ---
  VG Name               vg01
  System ID             
  Format                lvm2
  Metadata Areas        3
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                3
  Act PV                3
  VG Size               108.00 MiB
  PE Size               4.00 MiB
  Total PE              27
  Alloc PE / Size       18 / 72.00 MiB
  Free  PE / Size       9 / 36.00 MiB
  VG UUID               FYhnWm-dd6B-P8kj-MK9S-zxR8-W3ve-MPrxGH
   
  --- Logical volume ---
  LV Path                /dev/vg01/lv01
  LV Name                lv01
  VG Name                vg01
  LV UUID                emAeFr-2YB1-fTJo-uI0h-5mLc-rw7P-9rwlyr
  LV Write Access        read/write
  LV Creation host, time kali, 2022-02-15 13:01:37 +0800
  LV Status              available
  # open                 1
  LV Size                72.00 MiB
  Current LE             18
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Physical volumes ---
  PV Name               /dev/loop1     
  PV UUID               ViWGQr-fuwf-59AL-Nk29-IJsb-CdCO-EuIPCZ
  PV Status             allocatable
  Total PE / Free PE    9 / 0
   
  PV Name               /dev/loop2     
  PV UUID               P5ttDN-p9p0-2XRk-Db0X-3z5t-Yzu6-QztWqW
  PV Status             allocatable
  Total PE / Free PE    9 / 0
   
  PV Name               /dev/loop5     
  PV UUID               S2SQBz-pV7Z-8r0z-8cLO-de9Q-dMoD-fQ8I6X
  PV Status             allocatable
  Total PE / Free PE    9 / 9

逻辑卷lv扩容

sudo lvextend -L +30M /dev/vg01/lv01
# sudo lvextend -L +30GB /dev/vg01/lv01
sudo umount /dev/vg01/lv01
sudo e2fsck -f /dev/vg01/lv01
sudo resize2fs /dev/vg01/lv01
sudo mount /dev/vg01/lv01 /lv01

df -h /lv01
# 文件系统                  容量  已用  可用    已用%   挂载点
# /dev/mapper/vg01-lv01   94M  1.6M   85M    2%     /lv01

其他

# lv卷缩容
 sudo lvreduce -L 30M -r /dev/vg01/lv01
# 移动pv
 sudo pvmove /dev/loop1 /dev/loop5
 sudo vgdisplay -v vg01
# 从vg卷中删除pv
 sudo vgreduce vg01 /dev/loop1
# 从pv中删除设备
 sudo pvremove /dev/loop1