目录
- 配置
- 创建逻辑卷并格式化
- 步骤 1 执行如下命令创建逻辑卷。
- 步骤 2 执行如下命令格式化LV并挂载。
- 逻辑卷扩容与缩容
- 步骤 1 执行如下命令扩展逻辑卷与文件系统。
- 步骤 2 执行如下步骤缩容文件系统与LV。（此步骤是高危操作，在工作中请谨慎！）
- 总结
- 创建逻辑卷
- 查看逻辑卷
- 扩容逻辑卷
- 缩容逻辑卷
- 删除逻辑卷
配置
创建逻辑卷并格式化
步骤 1 执行如下命令创建逻辑卷。
[root@openEuler ~]# pvcreate /dev/sde5
Physical volume “/dev/sde5” successfully created.
[root@openEuler ~]# pvdisplay
"/dev/sde5" is a new physical volume of "2.00 GiB"--- NEW Physical volume ---PV Name /dev/sde5VG NamePV Size 2.00 GiBAllocatable NOPE Size 0Total PE 0Free PE 0Allocated PE 0PV UUID wSgzbu-oFkH-rxL7-tt7e-QQA4-RZsX-rC2BSb
[root@openEuler ~]# vgcreate testvg /dev/sde5Volume group "testvg" successfully created
[root@openEuler ~]# vgdisplay testvg--- Volume group ---VG Name testvgSystem IDFormat lvm2Metadata Areas 1Metadata Sequence No 1VG Access read/writeVG Status resizableMAX LV 0Cur LV 0Open LV 0Max PV 0Cur PV 1Act PV 1VG Size <2.00 GiBPE Size 4.00 MiBTotal PE 767Alloc PE / Size 0 / 0Free PE / Size 767 / <3.00 GiBVG UUID O63DUX-eojV-iUfw-75ib-yeZP-N0xx-JXyOeY
[root@openEuler ~]# lvcreate -L 1.5G -n testlv testvgLogical volume "testlv" created.
[root@openEuler ~]# lvdisplay /dev/testvg/testlv--- Logical volume ---LV Path /dev/testvg/testlvLV Name testlvVG Name testvgLV UUID wfSItH-O3cf-9pxa-emMW-BSwI-ZfWQ-uS6vYLLV Write Access read/writeLV Creation host, time openEuler, 2020-07-02 09:24:41 +0800LV Status available# open 0LV Size 1.50 GiBCurrent LE 384Segments 1Allocation inheritRead ahead sectors auto- currently set to 8192Block device 253:2
步骤 2 执行如下命令格式化LV并挂载。
[
root@openEuler ~]# mkfs.ext4 /dev/testvg/testlv
mke2fs 1.45.3 (14-Jul-2019)
Creating filesystem with 524288 4k blocks and 131072 inodes
Filesystem UUID: 59f52483-742c-41bd-b83b-3edb9c315611
Superblock backups stored on blocks:32768, 98304, 163840, 229376, 294912Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@openEuler ~]# mkdir /mnt/testlv
[root@openEuler ~]# mount /dev/testvg/testlv /mnt/testlv/
[root@openEuler ~]# df -h | grep testvg
/dev/mapper/testvg-testlv 1.5G 24K 1.4G 1% /mnt/testlv
逻辑卷扩容与缩容
步骤 1 执行如下命令扩展逻辑卷与文件系统。
[root@openEuler ~]# fdisk /dev/sdd #新建一个大小同样为3G的LVM分区Welcome to fdisk (util-linux 2.34).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0xc5aa0a0a.Command (m for help): n
Partition typep primary (0 primary, 0 extended, 4 free)e extended (container for logical partitions)
Select (default p):Using default response p.
Partition number (1-4, default 1):
First sector (2048-20971519, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-20971519, default 20971519): +3GCreated a new partition 1 of type 'Linux' and of size 3 GiB.Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'.Command (m for help): p
Disk /dev/sdd: 10 GiB, 10737418240 bytes, 20971520 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc5aa0a0aDevice Boot Start End Sectors Size Id Type
/dev/sdd1 2048 6293503 6291456 3G 8e Linux LVMCommand (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
[root@openEuler ~]# pvcreate /dev/sdd1Physical volume "/dev/sdd1" successfully created.
[root@openEuler ~]# vgextend testvg /dev/sdd1 #仅有在PE大小一致时，才可以扩展Volume group "testvg" successfully extended[root@openEuler ~]# vgdisplay testvg--- Volume group ---VG Name testvgSystem IDFormat lvm2Metadata Areas 2Metadata Sequence No 3VG Access read/writeVG Status resizableMAX LV 0Cur LV 1Open LV 1Max PV 0Cur PV 2Act PV 2VG Size 5.99 GiBPE Size 4.00 MiBTotal PE 1534Alloc PE / Size 512 / 2.00 GiBFree PE / Size 1022 / 3.99 GiBVG UUID O63DUX-eojV-iUfw-75ib-yeZP-N0xx-JXyOeY
[root@openEuler ~]# pvsPV VG Fmt Attr PSize PFree/dev/sda3 openeuler lvm2 a-- 9.80g 0/dev/sde5 testvg lvm2 a-- <2.00g 1020.00m/dev/sdd1 testvg lvm2 a-- <3.00g <3.00g
[root@openEuler ~]# vgsVG #PV #LV #SN Attr VSize VFreeopeneuler 1 2 0 wz--n- 9.80g 0testvg 2 1 0 wz--n- 4.99g 3.99g #此处可以看到已经扩展到了6G
[root@openEuler ~]# lvs /dev/testvg/testlv #查看testlv信息LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Converttestlv testvg -wi-ao---- 1.50g
[root@openEuler ~]# lvextend -L +3G /dev/testvg/testlvSize of logical volume testvg/testlv changed from 2.00 GiB (512 extents) to 5.00 GiB (1280 extents).Logical volume testvg/testlv successfully resized.[root@openEuler ~]# lvs /dev/testvg/testlvLV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Converttestlv testvg -wi-ao---- 4.50g
[root@openEuler ~]# resize2fs /dev/testvg/testlv
resize2fs 1.46.4 (18-Aug-2021)
Filesystem at /dev/testvg/testlv is mounted on /mnt/testlv; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/testvg/testlv is now 1179648 (4k) blocks long.
[root@openEuler ~]# df -h /dev/testvg/testlv
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/testvg-testlv 4.4G 24K 4.2G 1% /mnt/testlv #可以看到文件系统扩展了
步骤 2 执行如下步骤缩容文件系统与LV。（此步骤是高危操作，在工作中请谨慎！）
[root@openEuler ~]# umount /mnt/testlv #卸载文件系统
[root@openEuler ~]# e2fsck -f /dev/testvg/testlv #检查文件系统使用情况
e2fsck 1.46.4 (18-Aug-2021)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/testvg/testlv: 11/294912 files (0.0% non-contiguous), 28246/1179648 blocks
[root@openEuler ~]# resize2fs /dev/testvg/testlv 2G #重新指定文件系统逻辑大小
resize2fs /dev/testvg/testlv 2G
[root@openEuler ~]# lvs /dev/testvg/testlvLV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Converttestlv testvg -wi-a----- 4.50g #可以看到LV没有缩减
[root@openEuler ~]# lvchange -a n /dev/testvg/testlv #将LV修改为不活动状态
[root@openEuler ~]# lvreduce -L 2G /dev/testvg/testlv #缩减LV大小为2GSize of logical volume testvg/testlv changed from 4.50 GiB (1152 extents) to 2.00 GiB (512 extents).Logical volume testvg/testlv successfully resized.
[root@openEuler ~]# lvchange -a y /dev/testvg/testlv #修改LV为活动状态
[root@openEuler ~]# lvs /dev/testvg/testlv #查看LV大小LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Converttestlv testvg -wi-a----- 2.00g
[root@openEuler ~]# e2fsck -f /dev/testvg/testlv #检查文件系统
e2fsck 1.46.4 (18-Aug-2021)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/testvg/testlv: 11/131072 files (0.0% non-contiguous), 17580/524288 blocks
[root@openEuler ~]# mount /dev/testvg/testlv /mnt/testlv/ #重新挂载
[root@openEuler ~]# df -h /dev/testvg/testlv #查看大小
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/testvg-testlv 2.0G 6.0M 1.9G 1% /mnt/testlv
步骤 3 执行如下步骤删除创建的LVM配置。
[root@openEuler ~]# umount /mnt/testlv
[root@openEuler ~]# lvremove -y /dev/testvg/testlvLogical volume "testlv" successfully removed
[root@openEuler ~]# vgremove testvg #移除VGVolume group "testvg" successfully removed
[root@openEuler ~]# pvremove /dev/sde5 /dev/sdd1 #移除PVLabels on physical volume "/dev/sde5" successfully wiped.Labels on physical volume "/dev/sdd1" successfully wiped.
总结
先创建pv，再用一（多）个pv创建vg，使用一个vg的空间创建一（多）个lv
创建逻辑卷
#创建pvpvcreate /dev/LVM类型盘号
#创建vgvgcreate VG名 /dev/LVM类型盘号
#创建lvlvcreate -L LV大小 -n LV名 VG名
查看逻辑卷
#查看详细信息，[]为可选pvdisplay [/dev/LVM类型盘号]vgdisplay [VG名]lvdisplay [/dev/VG名/LV名]#查看汇总信息pvsvgslvs
扩容逻辑卷
#使用pv扩容vg
#使用vgdisplay可以看到Act PV为多个vgextend testvg /dev/其他的LVM类型盘号#扩容lvlvextend -L 扩容大小 /dev/VG名/LV名# 文件系统resizeresize2fs /dev/VG名/LV名
缩容逻辑卷
#设置LV为不活动lvchange -a n /dev/testvg/testlv #缩减LVlvreduce -L 2G /dev/testvg/testlv#设置LV为活动lvchange -a y /dev/testvg/testlv#检查文件系统e2fsck -f /dev/testvg/testlv删除逻辑卷
#删除LVlvremove -y /dev/testvg/testlv#删除VGvgremove testvg#删除PVpvremove /dev/sde5 /dev/sdd1 
