LVM是Linux系统中对磁盘分区进行管理的一种逻辑机制,它是建立在硬盘和分区之上、文件系统之下的一个逻辑层,在建立文件系统时屏蔽了下层的磁盘分区布局,能够在保持现有数据不变的情况下动态调整磁盘容量,从而提高磁盘管理的灵活性。
虚拟机添加三块硬盘:( 硬盘的大小可以不一致 )
备注:服务器重启后,才能识别新硬盘。
查看新添加的硬盘:
将三块盘都创建为物理卷:
[root@localhost ~]# pvcreate /dev/sd[b-d]
Physical volume "/dev/sdb" successfully created
Physical volume "/dev/sdc" successfully created
Physical volume "/dev/sdd" successfully created
扫描系统中的所有物理卷,并输出相关信息:
[root@localhost ~]# pvscan
PV /dev/sda2 VG VolGroup lvm2 [99.51 GiB / 0 free]
PV /dev/sdb lvm2 [10.00 GiB]
PV /dev/sdc lvm2 [10.00 GiB]
PV /dev/sdd lvm2 [10.00 GiB]
Total: 4 [129.51 GiB] / in use: 1 [99.51 GiB] / in no VG: 3 [30.00 GiB]
创建卷组:
[root@localhost ~]# vgcreate vg_base /dev/sd[b-d]
Volume group "vg_base" successfully created
查看某个卷组:
[root@localhost ~]# vgdisplay vg_base
--- Volume group ---
VG Name vg_base
System ID
Format lvm2
Metadata Areas 3
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 3
Act PV 3
VG Size 29.99 GiB
PE Size 4.00 MiB
Total PE 7677
Alloc PE / Size 0 / 0
Free PE / Size 7677 / 29.99 GiB
VG UUID IUDnu6-tb6w-Nqle-dL03-IB4N-ZHBb-DfprkL
创建逻辑卷lv_001、lv_002(不能把空间全部分完,要留0.1G )
lvcreate -L 12.9G -n lv_001 vg_base
lvcreate -L 17G -n lv_002 vg_base
显示系统中所有逻辑卷的详细信息:
lvdisplay
只显示指定逻辑卷的详细信息:(注意逻辑卷的名字)
[root@localhost ~]# lvdisplay /dev/vg_base/lv_001
--- Logical volume ---
LV Path /dev/vg_base/lv_001
LV Name lv_001
VG Name vg_base
LV UUID ZRWsT5-UJgL-IL9S-yjNV-Cnwe-Pw2C-E61FF3
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2020-02-27 12:44:06 +0800
LV Status available
# open 0
LV Size 12.90 GiB
Current LE 3303
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
[root@localhost ~]# lvdisplay /dev/vg_base/lv_002
--- Logical volume ---
LV Path /dev/vg_base/lv_002
LV Name lv_002
VG Name vg_base
LV UUID GKgoHQ-mvg8-CK1d-KHY3-KsIm-ofuJ-uE9y0b
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2020-02-27 12:44:06 +0800
LV Status available
# open 0
LV Size 17.00 GiB
Current LE 4352
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
创建ETX4文件系统:
mkfs.ext4 /dev/vg_base/lv_001
mkfs.ext4 /dev/vg_base/lv_002
创建挂载目录/dir1,/dir2
mkdir -p /dir1
mkdir -p /dir2
挂载EXT4文件系统:
mount /dev/vg_base/lv_001 /dir1
mount /dev/vg_base/lv_002 /dir2
挂载成功:
设置服务器开机自动挂载文件系统:
cat >>/etc/fstab<< eof
/dev/vg_base/lv_001 /dir1 ext4 defaults 0 0
/dev/vg_base/lv_002 /dir2 ext4 defaults 0 0
eof
###
再加一块20G硬盘,给/dir1增大20G
将新加的盘创建为物理卷:
pvcreate /dev/sde
用 /dev/sde给卷组 vg_base 扩展:
vgextend vg_base /dev/sde
给逻辑卷扩展:
lvextend -L +20G /dev/vg_base/lv_001
重建EXT4文件系统:(无需卸载分区)
resize2fs /dev/vg_base/lv_001
/dir1扩展成功:
备注:挂载分区扩展无需重启系统;重启系统后,挂载分区也正常。 |