主要参考man page

virt-df 列出虚机文件系统的剩余空间
virt-df - Display free space on virtual filesystems

-a：后接镜像
[root@cloudmanager datapool]# virt-df -a centos56x64
Filesystem                                     1K-blocks       Used        Available    Use%
centos56x64:/dev/sda1                   194442        12858      171545      7%
centos56x64:/dev/vmvg/root           5872136      2155876   3413156    37%

-d：后接domain，就是虚机名
[root@cloudmanager ~]# virt-df cacti
Filesystem                           1K-blocks       Used  Available  Use%
cacti:/dev/sda1                         495844      52884     417360   11%
cacti:/dev/VolGroup/lv_root           47033288    2281128   42362964    5%

-h：以M，G显示分区大小，可读性较强
[root@cloudmanager datapool]# virt-df -a centos56x64 -h
Filesystem                                Size       Used  Available  Use%
centos56x64:/dev/sda1                     190M        13M       168M    7%
centos56x64:/dev/vmvg/root                5.6G       2.1G       3.3G   37%

--csv：以表格的形式显示结果，这样可以导入数据库和电子表格里
[root@cloudmanager datapool]# virt-df -a centos56x64 --csv
VirtualMachine,Filesystem,1K-blocks,Used,Available,Use%
centos56x64,/dev/sda1,194442,12858,171545,6.6
centos56x64,/dev/vmvg/root,5872136,2155876,3413156,36.7

-i：显示inode
[root@cloudmanager datapool]# virt-df  -a centos56x64 -i
Filesystem                              Inodes      IUsed       IFree         IUse%
centos56x64:/dev/sda1           50200         35         50165       1%
centos56x64:/dev/vmvg/root  1516032      87962    1428070    6%

-V：显示版本号
[root@cloudmanager datapool]# virt-df  -a centos56x64 -V
virt-df 1.16.19rhel=6,release=1.el6

-x：显示trace信息
[root@cloudmanager datapool]# virt-df  -a centos56x64 -x

SEE ALSO
       df(1), guestfs(3), guestfish(1), virt-filesystems(1), .