1.为主机增加80G SCSI 接口硬盘
磁盘 /dev/sdb:85.9 GB, 85899345920 字节,167772160 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节
2.划分三个各20G的主分区
  设备 Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048    41945087    20971520   83  Linux
/dev/sdb2        41945088    83888127    20971520   83  Linux
/dev/sdb3        83888128   125831167    20971520   83  Linux
3.将三个主分区转换为物理卷(pvcreate),扫描系统中的物理卷
[root@localhost ~]# pvcreate /dev/sdb{1..3}
  Physical volume "/dev/sdb1" successfully created.
  Physical volume "/dev/sdb2" successfully created.
  Physical volume "/dev/sdb3" successfully created.
[root@localhost ~]# pvscan
  PV /dev/sda2   VG centos          lvm2 [<39.00 GiB / 4.00 MiB free]
  PV /dev/sdb2                      lvm2 [20.00 GiB]
  PV /dev/sdb1                      lvm2 [20.00 GiB]
  PV /dev/sdb3                      lvm2 [20.00 GiB]
  Total: 4 [<99.00 GiB] / in use: 1 [<39.00 GiB] / in no VG: 3 [60.00 GiB]
4.使用两个物理卷创建卷组,名字为myvg,查看卷组大小
[root@localhost ~]# vgcreate myvg /dev/sdb{1,2}
  Volume group "myvg" successfully created
[root@localhost ~]# vgscan
  Reading volume groups from cache.
  Found volume group "myvg" using metadata type lvm2
  Found volume group "centos" using metadata type lvm2
5.创建逻辑卷mylv,大小为30G
[root@localhost ~]# lvcreate -L 30G -n mylv myvg
  Logical volume "mylv" created.
6.将逻辑卷格式化成xfs文件系统,并挂载到/data目录上,创建文件测试
[root@localhost ~]# mkfs.xfs  /dev/myvg/mylv
[root@localhost ~]# mkdir /data
[root@localhost ~]# mount /dev/myvg/mylv   /data
[root@localhost ~]# echo "121234">/data/text.txt
7.增大逻辑卷到35G
[root@localhost ~]# lvextend -L +5G /dev/myvg/mylv
  Size of logical volume myvg/mylv changed from 30.00 GiB (7680 extents) to 35.00 GiB (8960 extents).
  Logical volume myvg/mylv successfully resized.
[root@localhost ~]# xfs_growfs  /dev/myvg/mylv
[root@localhost ~]# lvdisplay   /dev/myvg/mylv
 LV Size                35.00 GiB
[root@localhost ~]# df -hT
/dev/mapper/myvg-mylv   xfs        35G   33M   35G    1% /data
8.编辑/etc/fstab文件挂载逻辑卷,并支持磁盘配额选项
9.创建磁盘配额,crushlinux用户在/data目录下文件大小软限制为80M,硬限制为100M,
crushlinux用户在/data目录下文件数量软限制为80个,硬限制为100个。
10.使用touch dd 命令在/data目录下测试
11.查看配额的使用情况:用户角度