Unable to create any files under '/' and /export/home as root user

Dear Forum,

Please help me on this problem.

In my server I cant create any files under / and /export/home . But I can save files under /var, /tmp ,/opt

#cd /

#touch tempfile

touch: tempfile cannot create

#cd /export/

# ls -lp

total 2

drwxr-xr-x   9 root     root         512 Oct 20 11:09 home/

# cd home

# touch testfile

touch: testfile cannot create

# id

uid=0(root) gid=0(root)

# df -kh

Filesystem             size   used  avail capacity  Mounted on

/dev/md/dsk/d0         9.9G   5.5G   4.2G    57%    /

/devices                 0K     0K     0K     0%    /devices

ctfs                     0K     0K     0K     0%    /system/contract

proc                     0K     0K     0K     0%    /proc

mnttab                   0K     0K     0K     0%    /etc/mnttab

swap                    22G   1.2M    22G     1%    /etc/svc/volatile

objfs                    0K     0K     0K     0%    /system/object

/dev/md/dsk/d3         9.9G   6.8G   3.0G    70%    /usr

/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap2.so.1

                       9.9G   5.5G   4.2G    57%    /platform/sun4u-us3/lib/libc_psr.so.1

/platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap2.so.1

                       9.9G   5.5G   4.2G    57%    /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1

fd                       0K     0K     0K     0%    /dev/fd

/dev/md/dsk/d5         7.9G   2.5G   5.3G    33%    /var

swap                    22G   400K    22G     1%    /tmp

swap                    22G    48K    22G     1%    /var/run

/dev/md/dsk/d4          20G   4.7G    15G    25%    /opt

/dev/md/dsk/d6          63G    36G    26G    58%    /data

# more /etc/vfstab

#device         device          mount           FS      fsck    mount   mount

#to mount       to fsck         point           type    pass    at boot options

#

fd      -       /dev/fd fd      -       no      -

/proc   -       /proc   proc    -       no      -

/dev/md/dsk/d1  -       -       swap    -       no      -

/dev/md/dsk/d0  /dev/md/rdsk/d0 /       ufs     1       no      -

/dev/md/dsk/d3  /dev/md/rdsk/d3 /usr    ufs     1       no      -

/dev/md/dsk/d5  /dev/md/rdsk/d5 /var    ufs     1       no      -

/dev/md/dsk/d6  /dev/md/rdsk/d6 /data   ufs     2       yes     -

/dev/md/dsk/d4  /dev/md/rdsk/d4 /opt    ufs     2       yes     -

#10.183.103.11:/backup  -       /backup nfs     -       yes     rw

/devices        -       /devices        devfs   -       no      -

ctfs    -       /system/contract        ctfs    -       no      -

objfs   -       /system/object  objfs   -       no      -

swap    -       /tmp    tmpfs   -       yes     -

10.183.103.11:/nfs_backup/NCMDB1 - /rman_backup nfs 0 yes rw,bg,intr,hard,timeo=600,wsize=32768,rsize=32768

Regards,