The following info keys are reserved. They are strings.
access_style
accumulate_ops
accumulate_ordering
alloc_shared_noncontig
appnum
arch
cb_block_size
cb_buffer_size
cb_nodes
chunked_item
chunked_size
chunked
collective_buffering
file_perm
filename
file
host
io_node_list
ip_address
ip_port
nb_proc
no_locks
num_io_nodes
path
same_disp_unit
same_size
soft
striping_factor
striping_unit
wdir