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:
将三块硬盘都创建为物理卷:
[root@centos8 ~]# pvcreate /dev/nvme0n[2-4]
Physical volume "/dev/nvme0n2" successfully created.
Physical volume "/dev/nvme0n3" successfully created.
Physical volume "/dev/nvme0n4" successfully created.
扫描系统中的所有物理卷,并输出相关信息:
[root@centos8 ~]# pvscan
PV /dev/nvme0n1p2 VG cl lvm2 [79.80 GiB / 0 free]
PV /dev/nvme0n2 lvm2 [10.00 GiB]
PV /dev/nvme0n3 lvm2 [10.00 GiB]
PV /dev/nvme0n4 lvm2 [10.00 GiB]
Total: 4 [109.80 GiB] / in use: 1 [79.80 GiB] / in no VG: 3 [30.00 GiB]
创建卷组:
[root@centos8 ~]# vgcreate vg_base /dev/nvme0n[2-4]
Volume group "vg_base" successfully created
查看某个卷组:
[root@centos8 ~]# 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 aBoPX4-3Sez-10TD-h3nL-j61S-P9Ds-r5vKT9
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@centos8 ~]# 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 F8Dnau-45f5-eyNJ-kZ7l-jYZH-EYtC-suVUN2
LV Write Access read/write
LV Creation host, time centos8.zhuohua.store, 2020-04-03 20:13:45 +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 8192
Block device 253:2
[root@centos8 ~]# 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 G1tQKP-nNPu-9TlR-wynH-B3Y6-w02X-JNxHAg
LV Write Access read/write
LV Creation host, time centos8.zhuohua.store, 2020-04-03 20:13:51 +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 8192
Block device 253:3
创建xfs文件系统:
mkfs -t xfs /dev/vg_base/lv_001
mkfs -t xfs /dev/vg_base/lv_002
创建挂载目录/dir1,/dir2
mkdir -p /dir1
mkdir -p /dir2
挂载xfs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 xfs defaults 0 0
/dev/vg_base/lv_002 /dir2 xfs 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/nvme0n5
用 /dev/nvme0n5给卷组 vg_base 扩展:
vgextend vg_base /dev/nvme0n5
给逻辑卷扩展:
lvextend -L +20G /dev/vg_base/lv_001
刷新xfs文件系统:
[root@centos8 ~]# xfs_growfs /dir1
注释:逻辑卷/dev/vg_base/lv_001挂载在 /dir1
/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。 |