一、实验环境
系统
centos7.4
磁盘
/dev/vdb /dev/vdc
二、步骤
2.1 使用fdisk查看空闲磁盘/dev/vdb和/dev/vdc。
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# fdisk -l
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 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
Disk label type: dos
Disk identifier: 0x0008d73a
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 83884031 41940992 83 Linux
Disk /dev/vdb: 21.5 GB, 21474836480 bytes, 41943040 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
Disk /dev/vdc: 21.5 GB, 21474836480 bytes, 41943040 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
2.2 安装lvm工具
yum install lvm2 -y
2.3 创建物理卷
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# pvcreate /dev/vdb /dev/vdc
Physical volume "/dev/vdb" successfully created.
Physical volume "/dev/vdc" successfully created.
2.4 查看物理卷
下面显示了有两个物理卷，分别属于test这个卷组。ps：在创建完卷组后运行的pvdispaly，所有这两个物理卷会有卷组名。
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# pvdisplay
--- Physical volume ---
PV Name /dev/vdb
VG Name test
PV Size 20.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 5119
Free PE 0
Allocated PE 5119
PV UUID AXWX7I-weYa-bTVb-mD9g-3m2S-GenW-0mk2If
--- Physical volume ---
PV Name /dev/vdc
VG Name test
PV Size 20.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 5119
Free PE 2558
Allocated PE 2561
PV UUID iz42TA-E17K-TiHM-LYpY-tlR2-QcmA-VQ2J9b
2.5 将两个物理卷，创建名为test的卷组
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# vgcreate test /dev/vdb /dev/vdc
Volume group "test" successfully created
2.6 查看卷组
下面是卷组的信息
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# vgdisplay
--- Volume group ---
VG Name test
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 39.99 GiB
PE Size 4.00 MiB
Total PE 10238
Alloc PE / Size 7680 / 30.00 GiB
Free PE / Size 2558 / 9.99 GiB
VG UUID bS9YqZ-qlHW-tZ2g-j2eu-wuIB-VroE-OP18OK
2.7 创建一个容量为30G的逻辑卷
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# lvcreate -L +30G -n lvtest test
Logical volume "lvtest" created.
2.8 查看逻辑卷
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# lvdisplay
--- Logical volume ---
LV Path /dev/test/lvtest
LV Name lvtest
VG Name test
LV UUID PugZCF-N2RF-Q7Pu-M7eF-0IWY-hnE1-P06v0G
LV Write Access read/write
LV Creation host, time iZm5ehujytgo8uvw6cf2hqZ, 2018-04-01 08:48:19 +0800
LV Status available
# open 0
LV Size 30.00 GiB
Current LE 7680
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 252:0
2.9 使用fdisk查看，会发现多了一个设备/dev/mapper/test-lvtest，这个其实就是逻辑卷的映射
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# fdisk -l
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 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
Disk label type: dos
Disk identifier: 0x0008d73a
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 83884031 41940992 83 Linux
Disk /dev/vdb: 21.5 GB, 21474836480 bytes, 41943040 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
Disk /dev/vdc: 21.5 GB, 21474836480 bytes, 41943040 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
Disk /dev/mapper/test-lvtest: 32.2 GB, 32212254720 bytes, 62914560 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
2.10 格式化逻辑卷
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# mkfs.xfs /dev/mapper/test-lvtest
meta-data=/dev/mapper/test-lvtest isize=512 agcount=4, agsize=1966080 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=7864320, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=3840, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
2.11 挂载并使用
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# mkdir /opt/test
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# mount /dev/mapper/test-lvtest /opt/test
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/vda1 ext4 43G 1.6G 39G 4% /
devtmpfs devtmpfs 955M 0 955M 0% /dev
tmpfs tmpfs 965M 0 965M 0% /dev/shm
tmpfs tmpfs 965M 361k 964M 1% /run
tmpfs tmpfs 965M 0 965M 0% /sys/fs/cgroup
tmpfs tmpfs 193M 0 193M 0% /run/user/0
/dev/mapper/test-lvtest xfs 33G 34M 33G 1% /opt/test
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# echo "12">/opt/test/test.txt
[root@iZm5ehujytgo8uvw6cf2hqZ ~]# cat /opt/test/test.txt
12
2.12 在/etc/fstab写入配置，实现开机自启动
#
# /etc/fstab
# Created by anaconda on Sun Oct 15 15:19:00 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=eb448abb-3012-4d8d-bcde-94434d586a31 / ext4 defaults 1 1
/dev/mapper/test-lvtest /opt/test xfs defaults 0 0
