35-Linux-磁盘管理-LVM-创建和删除

朱雀 2022-08-25 15:39 148阅读 0赞

![SouthEast][]

# 创建 #

1) 将 物理磁盘设备 初始化为 物理卷  
pvcreate /dev/sdb /dev/sdc  
2) 创建卷组, 并将 PV 加入卷组  
vgcreate myvg /dev/sdb /dev/sdc  
3) 基于卷组创建逻辑卷  
lvcreate -n mylv -L 2G myvg  
4) 为 创建好的逻辑卷 创建文件系统  
mkfs.ext4 /dev/myvg/mylv  
5) 将格式化好的逻辑卷挂载后使用  
mount /dev/myvg/mylv /mnt

# 查看 #

物理卷信息  
详细: pvdisplay  
简短: pvs  
卷组信息  
详细: vgdisplay  
简短: vgs  
逻辑卷信息  
详细: lvdisplay  
简短: lvs

# 删除 #

0) 卸载  
umount /dev/myvg/mylv  
1) 删除 LV  
lvremove /dev/myvg/mylv  
2) 删除 VG  
vgremove myvg  
3) 删除物理卷  
pvremove /dev/sdc /dev/sdd

# 步骤 #

1) 查看 物理磁盘  
\# fdisk -l  
Disk /dev/sdc: 2147 MB, 2147483648 bytes  
Disk /dev/sdd: 2147 MB, 2147483648 bytes  
2) 将 物理磁盘 初始化为 PV  
\# pvcreate /dev/sdc /dev/sdd  
Writing physical volume data to disk "/dev/sdc"  
Physical volume "/dev/sdc" successfully created  
Writing physical volume data to disk "/dev/sdd"  
Physical volume "/dev/sdd" successfully created  
\# pvs  
PV VG Fmt Attr PSize PFree  
/dev/sdc lvm2 a-- 2.00g 2.00g  
/dev/sdd lvm2 a-- 2.00g 2.00g  
3) 创建卷组  
\# vgcreate myvg /dev/sdc /dev/sdd  
Volume group "myvg" successfully created  
\# vgs  
VG \#PV \#LV \#SN Attr VSize VFree  
myvg 2 0 0 wz--n- 3.99g 3.99g  
\# vgdisplay  
\--- Volume group ---  
VG Name myvg  
VG Size 3.99 GiB  
PE Size 4.00 MiB  
Total PE 1022  
Alloc PE / Size 0 / 0  
Free PE / Size 1022 / 3.99 GiB  
4) 创建逻辑卷  
\# lvcreate -n mylv -L 2G myvg  
Logical volume "mylv" created  
\# lvs  
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert  
mylv myvg -wi-a--- 2.00g  
\# ls -l /dev/myvg/mylv  
lrwxrwxrwx. 1 root root 7 Mar 11 23:07 /dev/myvg/mylv -> ../dm-0  
5) 格式化逻辑卷  
\# mkfs.ext4 /dev/myvg/mylv  
6) 挂载 并 使用  
\# mount /dev/myvg/mylv /mnt  
\# mount | tail -n 1  
/dev/mapper/myvg-mylv on /mnt type ext4 (rw)  
\# vgs  
VG \#PV \#LV \#SN Attr VSize VFree  
myvg 2 1 0 wz--n- 3.99g 1.99g  
\# pwd  
/mnt  
\# echo "hello lvm" > txtfile  
\# cat txtfile  
hello lvm  
7) 卸载  
\# umount /dev/myvg/mylv  
\# mount | tail -n 2  
8) 删除逻辑卷  
\# lvremove /dev/myvg/mylv  
Do you really want to remove active logical volume mylv? \[y/n\]: y  
Logical volume "mylv" successfully removed  
9) 删除卷组  
\# vgremove myvg  
Volume group "myvg" successfully removed  
10) 删物理卷  
\# pvremove /dev/sdc /dev/sdd  
Labels on physical volume "/dev/sdc" successfully wiped  
Labels on physical volume "/dev/sdd" successfully wiped

[SouthEast]: /images/20220824/81b820ce71334de6a0a51c2fca984418.png