Can you post your evidence like this please:
# ls -ld /u1/tmpint # is it mounted?
dr-xr-xr-x 1 root root 1 Jan 30 11:33 /u1/tmpint/
# perl -e 'if ( -w "/u1/tmpint" ) { print "TRUE\n" } else { print "FALSE\n" }'
FALSE
# ls -ld /u1/tmpint # is it mounted?
drwxrwxr-x 2506 root users 4365 Jan 31 10:27 /u1/tmpint/