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,

Please have the output of /etc/mnttab
/dev/md/dsk/d0 / ufs rw,intr,largefiles,logging,xattr,onerror=panic,dev=1540000 1382602314
/devices /devices        devfs dev=5400000     1382602306
ctfs /system/contract ctfs    dev=5440001     1382602306
proc    /proc proc    dev=5480000     1382602306
mnttab /etc/mnttab mntfs   dev=54c0001     1382602306
swap /etc/svc/volatile       tmpfs xattr,dev=5500001       1382602306
objfs   /system/object objfs dev=5540001     1382602306
/dev/md/dsk/d3 /usr ufs rw,intr,largefiles,logging,xattr,onerror=panic,dev=1540003 1382602315
/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap2.so.1 /platform/sun4u-us3/lib/libc_psr.so.1   lofs dev=1540000     1382602313
/platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap2.so.1 /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1 lofs    dev=1540000     1382602313
fd      /dev/fd fd      rw,dev=5700001 1382602315
/dev/md/dsk/d5 /var ufs rw,intr,largefiles,logging,xattr,onerror=panic,dev=1540005 1382602315
swap    /tmp tmpfs   xattr,dev=5500002 1382602315
swap /var/run        tmpfs xattr,dev=5500003       1382602315
/dev/md/dsk/d4 /opt ufs rw,intr,largefiles,logging,xattr,onerror=panic,dev=1540004 1382602318
/dev/md/dsk/d6 /data ufs rw,intr,largefiles,logging,xattr,onerror=panic,dev=1540006 1382602318
-hosts /net    autofs nosuid,indirect,ignore,nobrowse,dev=57c0001     1382602321
auto_home /home   autofs indirect,ignore,nobrowse,dev=57c0002 1382602321
NCM1:vold(pid393) /vol    nfs ignore,noquota,dev=5780001      1382602322

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keytool -genkey -keystore abc.com -keyalg rsa -dname "CN=Abc, OU=Def, O=GHI, L=KLMN, ST=OP, C=XY" -alias TheCert -validity 3600 -keypass password -storepass password2. Make jar file
3. Sign the jar file
jarsigner -keystore abc.com -storepass password -keypass password -signedjar SignedAppletTest.jar OrgAppletTest.jar TheCertIt works for me.
I'd like to thank harmmeijer and everyone who interests.
Cheers,

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

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