nLimit I/O by data limit
(limit= option).
nLimit I/O by record
limit (count= or records= options).
nLimit I/O by volume
limit (volumes= and vrecords= options).
nLimit I/O by runtime
limit (runtime=timeString option).
nControl of error limit
(errors= option, default is 1).
nControl of pass limit
(passes= option, default is 1).
nControl of multiple
processes (procs= option).
nControl of process
behavior (oncerror=abort or continue).
nControl of device types,
size, etc. (dtype= and dsize= options).
nPOSIX Asynchronous I/O
(enable=aio or aios= options).