df 查看到nfs mount点的Capacity值显示负数

Question

mail74# df
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/da0s1a 128990 126292 -7620 106% /
/dev/da0s1f 257998 8518 228842 4% /tmp
/dev/da0s1g 30522914 4910834 23170248 17% /usr
/dev/da0s1e 257998 257560 -20200 109% /var
procfs 4 4 0 100% /proc
192.168.123.201:/home1/mbox -487208840 -632106576 59200200 110% /usr/home/domains
192.168.123.201:/home2/mbox -690641780 98468692 -819322935 -14% /home1/domains