创建一个至少有两个PV组成的大小为20G的名为testvg的VG;要求PE大小 为16MB, 而后在卷组中创建大小为5G的逻辑卷testlv;挂载至/users目录

第一步:查看块设备信息

 第二步:创建PV

[root@centos7 ~]# pvcreate /dev/sdc /dev/sdd　　　　#创建物理卷
  Physical volume "/dev/sdc" successfully created.
  Physical volume "/dev/sdd" successfully created.
[root@centos7 ~]# pvs　　　　#显示pv
  PV         VG Fmt  Attr PSize  PFree 
  /dev/sdc      lvm2 ---  20.00g 20.00g
  /dev/sdd      lvm2 ---  20.00g 20.00g

第三步:创建VG

[root@centos7 ~]# vgcreate testvg /dev/sdc /dev/sdd -s 16　　#为卷组分配物理卷，并指定pe大小为16M
  Volume group "testvg" successfully created
[root@centos7 ~]# vgdisplay 　　#显示vg信息
  --- Volume group ---
  VG Name               testvg
  System ID             
  Format                lvm2
  Metadata Areas        2
  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                2
  Act PV                2
  VG Size               <39.97 GiB
  PE Size               16.00 MiB
  Total PE              2558
  Alloc PE / Size       0 / 0   
  Free  PE / Size       2558 / <39.97 GiB
  VG UUID               QReJnx-d31n-Lsla-G2S9-0fyp-QTIr-D7DPj1

第四步:创建LV

[root@centos7 ~]# lvcreate -n testlv -L 5G /dev/testvg　　　　#在卷组testvg中创建名为testlv，大小为5G
  Logical volume "testlv" created.
[root@centos7 ~]# lvdisplay 　　#显示testlv信息
  --- Logical volume ---
  LV Path                /dev/testvg/testlv
  LV Name                testlv
  VG Name                testvg
  LV UUID                TFqNMf-gTpA-o3Ot-FB7g-VyqE-gJ5I-JwEZOx
  LV Write Access        read/write
  LV Creation host, time centos7.lanfeng, 2020-07-28 10:06:36 +0800
  LV Status              available
  # open                 0
  LV Size                5.00 GiB
  Current LE             320
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

第五步:格式化lv

[root@centos7 ~]# mke2fs -t ext4 /dev/testvg/testlv 
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
327680 inodes, 1310720 blocks
65536 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1342177280
40 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

第六步:挂载

[root@centos7 ~]# mkdir /users　　　　#创建/users文件夹
[root@centos7 ~]# mount /dev/testvg/testlv /users/　　#挂载
[root@centos7 ~]# df 
Filesystem                1K-blocks    Used Available Use% Mounted on
/dev/sda2                 104806400 4864812  99941588   5% /
devtmpfs                     998216       0    998216   0% /dev
tmpfs                       1014056       0   1014056   0% /dev/shm
tmpfs                       1014056   10460   1003596   2% /run
tmpfs                       1014056       0   1014056   0% /sys/fs/cgroup
/dev/sda3                  52403200  104908  52298292   1% /data
/dev/sdb1                   1998538    9236   1960140   1% /mnt/sdb1
/dev/sda1                   1038336  167032    871304  17% /boot
tmpfs                        202812      12    202800   1% /run/user/42
tmpfs                        202812       0    202812   0% /run/user/0
/dev/mapper/testvg-testlv   5029504   20472   4730504   1% /users

如果想永久挂载可以将挂载信息写入到/etc/fstab中