mt command is rocognising all the 4 paths even the 0cbn i.e missing as shown in prevoius comment.
that means drives are accessible from OS .
and there are only paths related to 4 drives as shown below in /dev/rmt
#
# cd /dev/rmt
# ls -ltr
total 192
lrwxrwxrwx 1 root root 84 Nov 25 2014 4 -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:
lrwxrwxrwx 1 root root 85 Nov 25 2014 4n -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:n
lrwxrwxrwx 1 root root 85 Nov 25 2014 4b -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:b
lrwxrwxrwx 1 root root 86 Nov 25 2014 4bn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:bn
lrwxrwxrwx 1 root root 85 Nov 25 2014 4l -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:l
lrwxrwxrwx 1 root root 85 Nov 25 2014 4m -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:m
lrwxrwxrwx 1 root root 85 Nov 25 2014 4h -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:h
lrwxrwxrwx 1 root root 85 Nov 25 2014 4c -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:c
lrwxrwxrwx 1 root root 85 Nov 25 2014 4u -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:u
lrwxrwxrwx 1 root root 86 Nov 25 2014 4ln -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:ln
lrwxrwxrwx 1 root root 86 Nov 25 2014 4mn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:mn
lrwxrwxrwx 1 root root 86 Nov 25 2014 4hn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:hn
lrwxrwxrwx 1 root root 86 Nov 25 2014 4cn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:cn
lrwxrwxrwx 1 root root 86 Nov 25 2014 4un -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:un
lrwxrwxrwx 1 root root 86 Nov 25 2014 4lb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:lb
lrwxrwxrwx 1 root root 86 Nov 25 2014 4mb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:mb
lrwxrwxrwx 1 root root 86 Nov 25 2014 4hb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:hb
lrwxrwxrwx 1 root root 86 Nov 25 2014 4cb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:cb
lrwxrwxrwx 1 root root 86 Nov 25 2014 4ub -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:ub
lrwxrwxrwx 1 root root 87 Nov 25 2014 4lbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:lbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 4mbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:mbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 4hbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:hbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 4cbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:cbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 4ubn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056cb0,0:ubn
lrwxrwxrwx 1 root root 84 Nov 25 2014 6 -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:
lrwxrwxrwx 1 root root 85 Nov 25 2014 6n -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:n
lrwxrwxrwx 1 root root 85 Nov 25 2014 6b -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:b
lrwxrwxrwx 1 root root 86 Nov 25 2014 6bn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:bn
lrwxrwxrwx 1 root root 85 Nov 25 2014 6l -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:l
lrwxrwxrwx 1 root root 85 Nov 25 2014 6m -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:m
lrwxrwxrwx 1 root root 85 Nov 25 2014 6h -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:h
lrwxrwxrwx 1 root root 85 Nov 25 2014 6c -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:c
lrwxrwxrwx 1 root root 85 Nov 25 2014 6u -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:u
lrwxrwxrwx 1 root root 86 Nov 25 2014 6ln -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:ln
lrwxrwxrwx 1 root root 86 Nov 25 2014 6mn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:mn
lrwxrwxrwx 1 root root 86 Nov 25 2014 6hn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:hn
lrwxrwxrwx 1 root root 86 Nov 25 2014 6cn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:cn
lrwxrwxrwx 1 root root 86 Nov 25 2014 6un -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:un
lrwxrwxrwx 1 root root 86 Nov 25 2014 6lb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:lb
lrwxrwxrwx 1 root root 86 Nov 25 2014 6mb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:mb
lrwxrwxrwx 1 root root 86 Nov 25 2014 6hb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:hb
lrwxrwxrwx 1 root root 86 Nov 25 2014 6cb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:cb
lrwxrwxrwx 1 root root 86 Nov 25 2014 6ub -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:ub
lrwxrwxrwx 1 root root 87 Nov 25 2014 6lbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:lbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 6mbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:mbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 6hbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:hbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 6cbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:cbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 6ubn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cb1,0:ubn
lrwxrwxrwx 1 root root 84 Nov 25 2014 7 -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:
lrwxrwxrwx 1 root root 85 Nov 25 2014 7n -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:n
lrwxrwxrwx 1 root root 85 Nov 25 2014 7b -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:b
lrwxrwxrwx 1 root root 86 Nov 25 2014 7bn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:bn
lrwxrwxrwx 1 root root 85 Nov 25 2014 7l -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:l
lrwxrwxrwx 1 root root 85 Nov 25 2014 7m -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:m
lrwxrwxrwx 1 root root 85 Nov 25 2014 7h -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:h
lrwxrwxrwx 1 root root 85 Nov 25 2014 7c -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:c
lrwxrwxrwx 1 root root 85 Nov 25 2014 7u -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:u
lrwxrwxrwx 1 root root 86 Nov 25 2014 7ln -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:ln
lrwxrwxrwx 1 root root 86 Nov 25 2014 7mn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:mn
lrwxrwxrwx 1 root root 86 Nov 25 2014 7hn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:hn
lrwxrwxrwx 1 root root 86 Nov 25 2014 7cn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:cn
lrwxrwxrwx 1 root root 86 Nov 25 2014 7un -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:un
lrwxrwxrwx 1 root root 86 Nov 25 2014 7lb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:lb
lrwxrwxrwx 1 root root 86 Nov 25 2014 7mb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:mb
lrwxrwxrwx 1 root root 86 Nov 25 2014 7hb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:hb
lrwxrwxrwx 1 root root 86 Nov 25 2014 7cb -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:cb
lrwxrwxrwx 1 root root 86 Nov 25 2014 7ub -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:ub
lrwxrwxrwx 1 root root 87 Nov 25 2014 7lbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:lbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 7mbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:mbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 7hbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:hbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 7cbn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:cbn
lrwxrwxrwx 1 root root 87 Nov 25 2014 7ubn -> ../../devices/pci@0,0/pci8086,3410@9/pci103c,3261@0/fp@0,0/tape@w5001438016056cab,0:ubn
lrwxrwxrwx 1 root root 84 Apr 28 15:45 0 -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0n -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:n
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0b -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:b
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0bn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:bn
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0l -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:l
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0m -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:m
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0h -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:h
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0c -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:c
lrwxrwxrwx 1 root root 85 Apr 28 15:45 0u -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:u
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0ln -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:ln
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0mn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:mn
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0hn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:hn
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0cn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:cn
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0un -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:un
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0lb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:lb
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0mb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:mb
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0hb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:hb
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0cb -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:cb
lrwxrwxrwx 1 root root 86 Apr 28 15:45 0ub -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:ub
lrwxrwxrwx 1 root root 87 Apr 28 15:45 0lbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:lbn
lrwxrwxrwx 1 root root 87 Apr 28 15:45 0mbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:mbn
lrwxrwxrwx 1 root root 87 Apr 28 15:45 0hbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:hbn
lrwxrwxrwx 1 root root 87 Apr 28 15:45 0cbn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:cbn
lrwxrwxrwx 1 root root 87 Apr 28 15:45 0ubn -> ../../devices/pci@0,0/pci8086,340e@7/pci103c,3261@0/fp@0,0/tape@w5001438016056caa,0:ubn