1．为主机增加80G SCSI 接口硬盘
2．划分三个各20G的主分区
fdisk -l
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/sdc[123]
Physical volume "/dev/sdc1" successfully created
Physical volume "/dev/sdc2" successfully created
Physical volume "/dev/sdc3" successfully created
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- 29.51g 44.00m
/dev/sdc1 lvm2 --- 20.00g 20.00g
/dev/sdc2 lvm2 --- 20.00g 20.00g
/dev/sdc3 lvm2 --- 20.00g 20.00g
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/sdc[12]
Volume group "myvg" successfully created
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name myvg
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 39.99 GiB
PE Size 4.00 MiB
Total PE 10238
Alloc PE / Size 0 / 0
Free PE / Size 10238 / 39.99 GiB
VG UUID MNSzCi-MF8R-hoti-tvEs-YP3B-noz0-ZUADtS
5．创建逻辑卷mylv，大小为30G
[root@localhost ~]# lvcreate -L 30 -n mylv myvg
Rounding up size to full physical extent 32.00 MiB
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 -t xfs /dev/myvg/mylv
meta-data=/dev/myvg/mylv isize=256 agcount=2, agsize=4096 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=8192, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@localhost ~]# mount /dev/myvg/mylv /data
[root@localhost ~]# touch /data/lty.txt
[root@localhost ~]# ls /data
lty.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 32.00 MiB (8 extents) to 5.03 GiB (1288 extents).
Logical volume mylv successfully resized
[root@localhost ~]# xfs_growfs /dev/myvg/mylv
meta-data=/dev/mapper/myvg-mylv isize=256 agcount=2, agsize=4096 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=8192, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 8192 to 1318912
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
12．查看配额的使用情况：文件系统角度