[Users] not enough / filesystem to install engine

[陈良]

 Hi:
    when I was install engine,I got this problems:

Transaction Check Error:
  installing package ovirt-engine-backend-3.2.2-1.1.fc18.noarch needs 616KB on the / filesystem
  installing package ovirt-engine-setup-3.2.2-1.1.fc18.noarch needs 2MB on the / filesystem
  installing package ovirt-engine-webadmin-portal-3.2.2-1.1.fc18.noarch needs 43MB on the / filesystem
  installing package ovirt-engine-genericapi-3.2.2-1.1.fc18.noarch needs 43MB on the / filesystem
  installing package ovirt-engine-3.2.2-1.1.fc18.noarch needs 44MB on the / filesystem

Error Summary
-------------
Disk Requirements:
  At least 44MB more space needed on the / filesystem.


but  I still have enough space when i use df -H
[root at localhost mapper]# df -H
Filesystem               Size  Used Avail Use% Mounted on
rootfs                   4.3G  3.5G  702M  84% /
devtmpfs                 1.1G     0  1.1G   0% /dev
tmpfs                    1.1G  156k  1.1G   1% /dev/shm
tmpfs                    1.1G  7.3M  1.1G   1% /run
tmpfs                    1.1G     0  1.1G   0% /sys/fs/cgroup
/dev/sr0                 960M  960M     0 100% /run/initramfs/live
/dev/mapper/live-rw      4.3G  3.5G  702M  84% /
tmpfs                    1.1G  2.6M  1.1G   1% /tmp
varcacheyum              1.1G  805M  246M  77% /var/cache/yum
vartmp                   1.1G   33k  1.1G   1% /var/tmp
/dev/mapper/fedora-root   31G  3.5G   26G  12% /mnt/sysimage
/dev/mapper/fedora-boot  529M   81M  422M  17% /mnt/sysimage/boot
devtmpfs                 1.1G     0  1.1G   0% /mnt/sysimage/dev
/dev/tmpfs               1.1G     0  1.1G   0% /mnt/sysimage/dev/shm
/dev/tmpfs               1.1G  156k  1.1G   1% /dev/shm

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