制作交换2G分区:
dd if=/dev/zero of=/swapfile bs=1M count=2048
mkswap -f /swapfile    将文件转换成交换分区
swapon /swapfile             激活交换分区
swapon -s                    查看当前分区情况,可以确定是否成功
确保开机后能生效,需修改fstab
vim /etc/fstab
/swapfile               swap                    swap    defaults        0 0

增加逻辑卷:
1、扩逻辑卷  
lvextend -L 100M /dev/vgrhel/lvrhel
lvs
[root@server110 ~]# lvs
 LV     VG     Attr   LSize   Origin Snap%  Move Log Copy%  Convert
 lvrhel vgrhel -wi-ao 200.00m                                      


2、更新文件系统
resize2fs /dev/mapper/vgrhel-lvrhel


创建pv、创建卷组、创建逻辑卷,格式化成ext4
[root@localhost ~]# pvcreate /dev/sdc
 Writing physical volume data to disk "/dev/sdc"
[root@localhost ~]# vgcreate vgsdc /dev/sdc
 Volume group "vgsdc" successfully created
[root@localhost ~]# vgs
 VG    #PV #LV #SN Attr   VSize VFree
 vgsdc   1   0   0 wz--n- 5.00g 5.00g

lvcreate -n lvsdc -L 200M /dev/vgsdc
[root@localhost ~]# mkfs.ext4 /dev/vgsdc/lvsdc    (逻辑卷格式化成ext4)
[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              17G  4.9G   11G  31% /
tmpfs                 164M     0  164M   0% /dev/shm
/dev/sda1             194M   26M  159M  14% /boot
/dev/mapper/vgsdc-lvsdc
                     194M  5.6M  179M   4% /mnt/lvsdc

umount 卸载挂载的磁盘
卸载逻辑卷、卸载卷组、卸载pv
[root@localhost ~]# lvremove /dev/vg2/vo
Do you really want to remove active logical volume vo? [y/n]: y
 Logical volume "vo" successfully removed

[root@localhost ~]# vgremove vgc
 Volume group "vgc" successfully removed
[root@localhost ~]# pvremove /dev/sdb
 Labels on physical volume "/dev/sdb" successfully wiped

3、查询用户为harry,但是用户组不是harry的文件
find / -user harry -a -not -group harry

找出harry拥有的文件,拷贝到目录/opt/dir下
find / -user harry -exec \cp -rfp {} /opt/dir \;(-rf  强制递归,-p 拷贝权限)